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North
American plate; Los Angeles is on the northwest-moving Pacific plate; the two cities are thus moving toward each other, at the rate of about one inch per year. (They're literally "inching" toward each other.) Earthquakes happen along the fault because a particular section of one of the plates gets stuck on the other plate. Sooner or later, one or both of the plates gives way, and the section of plate that was stuck lurches forward more or less to where it would have been if it hadn't gotten stuck. That is what causes the earthquake, as the surface of the planet responds to the sudden movement deep underground. (The principle is similar to what happens when someone is standing on a stool that suddenly tips over; the "rupture" down below causes the "quake" above.) Any section of either tectonic plate, in either northern or southern California, can get stuck at any time; and subsequently rupture at any time. An earthquake along the southern California section of the San Andreas Fault can just as easily be followed by another southern California earthquake as by a northern California earthquake.
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Hundreds of cross sections were constructed to determine the basic structural form of the region. Some rather surprising conclusions were reached. The
Hayward and Calaveras Faults are not strike-slip faults. Each fault zone was aligned with a specific terrane, with faults not extending beyond the boundaries of the mini-terranes. The Hayward Fault is the leading edge of the semi-rigid Franciscan Bay block, which impinges on the Great Valley Sequence. A minimum of 35,000' of vertical displacement occurs at the fault. The Calaveras fault represents several different fault segments squeezed out of a highly deformed syncline. Correlations were made at scattered points along the syncline and separate faults were connected on small scale maps to give the impression that there was one continuous fault.
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subsurface and geophysical data is available and the presence of strike-slip faults is documented. Re-evaluation is not necessary at this time although geologic problems exist. The northern segment is poorly documented and will not be considered. The central segment has still not been examined in detailed geologic studies. A recent study failed to find evidence of assumed strike-slip faults. The geologic history and three dimensional analyses of geologic maps indicate that a compressive structural regime exists with mini-terranes impinging on a growing continent. The boundary faults of these mini-terranes were lined up on small scale maps to give the impression of a through going continuous fault.
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1113:"Seismologists predict that a repeat of the 1906 San Francisco Earthquake on the Northern segment of the San Andreas Fault could kill 6,000 or more people in San Francisco, California and other areas, shatter and burn 45,000 structures in San Francisco, and cause hundreds of billions of dollars in property and economic damage in the worst case scenario, if the quake strikes at 2:00 p.m., during rush hour, since the fault runs right through San Francisco.
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traction force exists, the same mantle current carrying the
Pacific Plate along also lies under the western part of the North American Plate, exerting some modification of its overall vector near the margin, and this might somehow be involved with the extensive faulting throughout the west as the underlying tractive force interacts with the southwesterly vector of the overlying plate. But so far, that's only a proposed hypothesis, I believe.
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1179:. Due to this bend, a huge amount of fracturing occurs, with the result that there are many faults running under southern California, as shown on the map. The east-west Transverse Ranges were created by folding and faulting from this bend in the plate boundaries. Farther east, the fault curves southward, and actually splits into three faults: the San Andreas on the east side running into the Salton Sea, the
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1159:. (This last one indicates there are two parts to the "Indio Segment". page 7) The upshot of my comment is that "The" San Andreas Fault is poorly described in the article and giving it a distinct southern terminus lacks nuance. (Perhaps the article should be titled "San Andreas Fault Zone".) Accordingly, I'm going to tag the article as needing an expert. --
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1794:. WOW! Bishop is almost surrounded by fault lines and one seems to point straight at the city. I brought up the old faithful Knowledge (XXG) article and while reading ended up at the "External links" section. A bell went off. It seems I was planning to work on the section, actually trim it with a chainsaw. I "took a gander" at the
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acceptable external links include those that contain further research that is accurate and on-topic, information that could not be added to the article for reasons such as copyright or amount of detail, or other meaningful, relevant content that is not suitable for inclusion in an article for reasons
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The same practice of "connecting the dots" has been applied to the San
Andreas system. Only reconnaisance geologic maps are available for portions of the fault system,and cross sections do not exist to determine the three dimensional nature of the boundary. Re-evaluation of the fault is critical for
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For example if
Southern California has its big one, wouldn't we expect a Northern California to have its big one as well? Evidence includes several minor earthquakes and the 1989 Loma Prieta that Southern California experiences that Northern California then experiences a few hours or days after. In
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An IP editor removed the failed verification tag on the quote from the paper, claiming it was right there in the abstract. I double checked the linked PDF of the paper, and I cannot find the quote in it anywhere. And now I'm suspicious that the summary of the paper extrapolates a bit beyond what the
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The task at hand, I will bring up the "External links" issues in a separate section, is that I do feel the article could, and really should, be worked to a better classification, maybe reaching
Featured article status. This hasn't happened in the last 8 years but a review certainly would not hurt.
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The listing of the locations is confusing. The locations within each of the three zones - Northern, Central, Southern, in that order - are listed in a South-North direction, so there is no continuity. Either the zones should be featured in the reverse order, or the locations within each of them
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One hundred and twenty two geologic quadrangles were evaluated in central
California in the Coast Ranges. All quadrangles were located generally to the east of the San Andreas Fault, but a few did include the fault. Geometric and structural principles were applied in re-mapping these quadrangles.
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Predicting earthquakes isn't like predicting thunderstorms. We are nowhere near capable of accurately predicting an imminent earthquake, if such precise prediction is possible at all. Keep in mind that geological timescales are much longer than, say, most meteorological phenomena; "soon" in geology
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The caption to the photo says 'in the valley floor' and I think that if you look there you can see a linear feature that presumably is the fault. OK, I know I'm a 'trained geologist' and I do agree that 'clearly visible' is overstating it a little, I'd prefer the term 'discernible'. In fact, lovely
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The San
Andreas Fault became an important geologic concept over 100 years ago. The San Andreas Fault has been divided into 3 segments - southern, central, and northern.The southern segment occurs in a separate structural province, south of the "Big Bend" and the Garlock Fault. Abundant surface,
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The arithmetic: 344 miles (554 km) divided by 1cm per year (given above) = 554 X 1000 X100 == 55.4 million years (roughly) - probably another 15-25my to separate into an island, a 2 or 3 hundred my to collide with Alaska. (This seems consistant with some numbers I saw on a Nova program, which I do
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There is nothing wrong with adding one or more useful content-relevant links to the external links section of an article; however, excessive lists can dwarf articles and detract from the purpose of
Knowledge (XXG). On articles about topics with many fansites, for example, including a link to one
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To answer your question, there is no correlation such as you suggest. The San
Andreas fault is one of the boundaries between the North American tectonic plate and the Pacific plate. The two plates are moving alongside each other in opposite directions. San Francisco is on the southeast-moving
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In the above text, 182 days was subtracted off the {{age}} date template so the number of years would round to the nearest value. In the {{Days elapsed times factor}} template, I used the actual date of the earthquake. The 33–37 mm slip rate was averaged and scaled to a centimeter-based value of
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mid-ocean ridge. The first spreading zone of the Gulf of California Rift Zone is right on the southeast shore of the Salton Sea. It's followed by a short strike-slip fault, then another spreading center in the middle of Imperial County near Brawley. The next strike-slip fault is the fairly long
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I hear news going around that there is alot of stress on the southern part of the San Andreas fault and southern California is on high earthquake alert and we are to expect a big earthquake within 72 hours or more. Would this be worth noting in the article? It's no hoax because it's even on the
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The vectors of motion out of the MidAtlantic Ridge are westward to southwestward. I don't believe anyone has yet shown that the North American Plate changes its direction of motion intraplate. There is the still-unproven, but perhaps plausible idea that, assuming an asthenosphere-lithospheric
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A recent citation of a newspaper regarding the probable effects of an earthquake prompts me to remind everyone: newspapers are not themselves authoritative sources regarding scientific interpretation. They generally can be deemed reliable in the reporting of observed effects, but for anything
1087:. So, there is clearly no correlation between northern and southern California earthquakes along the San Andreas Fault. It's just a random question of where the next piece of tectonic plate happens to get stuck, to build up pressure for a while, and then suddenly release the energy.
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Some things just grow during incremental edits and sometimes get out of hand. The "External links" section, one of the optional appendices, has grown to an astounding 11 entries. Three seems to be an acceptable number and of course, everyone has their favorite to try to add for a
906:"As if the San Andreas Fault weren't long and menacing enough, newly found mud pots and mud volcanoes now suggest it extends another 18 miles, going under the Salton Sea and beyond, in the desert southeast of Palm Springs." Article titled "San Andreas Fault Longer Than Thought".
917:"LOS ANGELES - A strong earthquake shook Southern California on Tuesday, causing buildings to sway and triggering some precautionary evacuations. There were no immediate reports of damage or injuries. The jolt was felt from Los Angeles to San Diego, and slightly in Las Vegas"
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This strain rate of 33–37 mm/year, which is about the speed at which a fingernail grows, may seem small. However, it quickly accumulates. Since the October 17, 1989 ] roughly {{age|1989|4|18}} years ago, the Pacific plate has moved approximately <u:
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Hey, everyone, I just added the new study by Yuri Fialko of Scripps Institution of Oceanography at the University of California, San Diego, which states that "the next big one" (magnitude 7.0 or greater) is "overdue" in southern California. Glad I live in
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It's not clear what you would like to see changed in the article as it stands. Without a source for statements such as "The Hayward and Calaveras Faults are not strike-slip faults", you are unlikely to persuade editors to change the current article.
1397:, opinion. Agencies like the USGS, CGS, and SCEC do compile secondary reports for the public (and public officials), which are not only soundly authoritative, but often quite interesting, and with a lot of detail most popular media skim over. ~
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3.5 cm/year, and divided by 365.25 to obtain a daily slip factor of 0.009582 centimeters per day. It is always wise to have at least 32 times more precision in a conversion factor, which explains the jump from 35 counts to 9582 counts.
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The San Andreas Fault's southern segment does not go farther south than Salton Sea. This is even stated in this article. It is the Imperial Fault that starts below the southern end of the San Andreas Fault and goes into Mexico.
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I will leave it to someone expert in the field of earthquakes to properly use this feature; I’m not sure as to what specific part of the San Andreas fault would be an appropriate place to reference a specific amount of strain.
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External links in an article can be helpful to the reader, but they should be kept minimal, meritable, and directly relevant to the article. With rare exceptions, external links should not be used in the body of an
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of an impending update after finishing other work. A parenthetical quote was supplied, "any week now?" The thing that could be funny, if not so serious, is that as of today that was "8 years, 5 months, 1 day
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The North American Plate moves in a west to southwest motion as a whole. Nowhere does it move southEAST. That is only a relative motion along the fault line, relative to the Pacific Plate's motion.
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then the talk page. OOPS! I might have dropped the ball on my practice of revisiting my edit history. A reminder might have been a notice that the impending "any week now?" might have arrived.
1187:. The latter two created the fault-block mountains of Orange, Riverside, San Diego, and Imperial Counties. The San Andreas proper ends on the south side of the Salton Sea. At this point, the
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I reverted recent edits, because they broke up and deleted part of the section on evolution of the fault system. An additional paragraph was added but I'm not sure where it would fit best -
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begins (although a last cracking spur of the San Andreas exists as the San Hills fault). From this point, the plate boundaries are no longer solely a transform fault. They are now a
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Links in the "External links" section should be kept to a minimum. A lack of external links or a small number of external links is not a reason to add external links.
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internet and listed on a site called quakeprediction.com. In fact, an expert seismologist has found there is alot of stress on the fault that is likely to rupture. --
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This strain rate of 33–37 mm/year, which is about the speed at which a fingernail grows, may seem small. However, it quickly accumulates. Since the October 17, 1989
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can mean decades, centuries, or even millennia. In other words, anyone claiming to be able to predict an earthquake within a period of a few days is full of it.
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Well, in my defense I was a strapping young pup, of only about 59, so might have been somewhat impetuous. My daughter has informed me that I definitely have
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This maybe so for a trained geologist. To me it just looks like some random photo of hilly terrain. Its not at all clear that it is a fault line at all.
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paper actually says. Am I missing something? Could another editor double-double-check it? A quote manufacture out of thin air seems a bit astonishing. --
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parameter is intended for organizational and similar names that don't get split into first and last names. Most personal names should be split into the
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The SA bends southeast north of Los Angeles at its "Big Bend" where it intersects the Pleito thrust fault. You can see a map about half way down
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I was under the impression that both plates were moving in the same direction, just that one was moving faster than the other. Is this right?
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I believe the direction of the plates is incorrect, but I am not experienced in this field. It would be great if an expert looked to this.
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1497:) presents time‐dependent earthquake probabilities for the third Uniform California Earthquake Rupture Forecast (UCERF3). Building on the
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prospective they, at best, quote authoritative sources ("researchers"). Which might be only one researcher's off-hand, and possible
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this context, I would ask if Southern California and Northern California should expect earthquakes due to the quake swarms in Baja?
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1212:. The whole centerline of the Gulf is like this... spreading and transform boundaries in a zig-zag. The Gulf is widening, and the
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or other citation templates in the External links section. Citation templates are permitted in the Further reading section.
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This is a largely an unregulated section meaning there is little or no maintenance. I will give my rationale, supported by
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Sometime on March 22nd, the value (which as of this writing displays as 64.33355 cm and rounds down to 64 cm) will round
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Is there an estimate of how many years it will take for Los Angeles to move so that it is parallel to San Francisco?
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A new template is available, which can make for interesting reading in this article if properly used. The template,
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it is scientifcally possible for the fault to 'break apart' isn't it. is there an estimate when this might happen?
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on whether should be some integrated treatment of all these faults, rather than the current piecemeal approach. -
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of past earthquakes indicate..."; This is confusing and dated content. Is this referring to UCERF2/3 or others?
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This template calculates the amount of change since a given date. For instance, a template filled in like this…
1535:). I am working up an article, and when it is ready (any week now?) I will update all the other references. ~
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The following Wikimedia Commons file used on this page or its Wikidata item has been nominated for deletion:
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Rise and Fall of San Diego: 150 Million Years of History Recorded in Sedimentary Rocks by Patrick L. Abbott
1147:. Then we have this map which indicates, vaguely, that the SA continues on down to the margin of the map:
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name (or family name) is how they are identified and collated, and misinformation impedes verification. ♦
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by the U.S. Geological Survey, known as UCERF 3.". There needs to be a source for this content and a date.
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on Knowledge (XXG). If you would like to participate, please visit the project page, where you can join
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until a consensus is reached, and readers of this page are welcome to contribute to the discussion.
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There is no doubt I am sometimes as slow, as well as behind, as Knowledge (XXG) maintenance. In the
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Transferred list for any possible discussion, swapping out, or maybe some inclusion in the article.
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1595:) parameters. This is important (especially for non-English and unusual names) because an author's
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Is there a correlation between Southern California earthquakes and Northern California earthquakes?
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Geology of San Diego County: Legacy of the Land by Steven G. Spear, Diane Burns and Lowell Lindsay
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as to why I am moving most (maybe all but three) here for any possible discussion resulting in
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resource. If you would like to participate, you can choose to edit this article, or visit the
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I think history has proven the folly of posting "Big earthquake within 72 hours" messages.
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Addendum - rather than colliding with Alaska the island would likely be subducted into the
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plate tectonic theory, textbook revision, and for accurate assessment of earthquake risk.
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Geology of the Elsinore Fault Zone, San Diego Region, San Diego Association of Geologists
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Besides which, here in San Francisco, we have about a dozen extremely minor earth quakes
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Knowledge (XXG):Redirects for discussion/Log/2021 December 20#The Big One (earthquake)
1195:/transform fault plate boundary, which is actually the northernmost part of the giant
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This publication says the SA fault branches into several other faults starting at the
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This was after an earthquake estimated at 5.4 strikes near Los Angeles - new from AP:
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A Commons file used on this page or its Wikidata item has been nominated for deletion
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You might ask “Why is that nice?” Because one can use it to generate text like this:
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Knowledge (XXG):Redirects for discussion/Log/2024 May 1 § The Big One (earthquake)
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another {{Days elapsed times factor|1989|10|17|0.009582|0}} cm</u: -->
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Knowledge (XXG) talk:WikiProject Astronomy/Solar System task force#External links
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Could someone look at this and provide dates (or confirm) with updated content?
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I can not determine (or confirm) when the latest report (UCERF3) was published.
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Complete Report for San Andreas fault zone, Peninsula section (Class A) No. 1c
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section that contain vague writing with a lack of dates or timelines. The
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UCERF3 was published in three parts, in 2013, 2014, and 2015 (details at
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that crosses into Mexico. Following a third spreading zone, you have the
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though this photo is, I think it's probably unnecessary for the article.
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Why does this say the San Andreas Fault ends in Baja California Mexico?
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Answer: probably in a million years or so...it moves like a CM a year
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1579:(and everyone else): please note that in the citation templates the
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http://nationalatlas.gov/articles/geology/features/sanandreas.html
2026:"Scientists Search for a Pulse in Skies Above Earthquake Country"
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New Scripps Study Reveals San Andreas Fault Set for the 'Big One'
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Also, the plates are not moving apart, they're moving sideways. -
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1493:"The 2014 Working Group on California Earthquake Probabilities (
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We should updated the main page 'Notable earthquakes' section.
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roughly 35 years ago, the Pacific plate has moved approximately
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Here’s the “live” slip rate, displayed with excess precision:
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Perhaps we need a new section on future earthquake hazard?
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you don’t have to go back and periodically tweak the value.
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Knowledge (XXG) talk:WikiProject External links#Mass links
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http://www.sci.sdsu.edu/salton/San%20AndreasFaultSyst.html
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Thule Scientific Interactive Map of the San Andreas Fault
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The problem is that none is needed for article promotion.
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section above I made comments and there was a reply from
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Geology of Anza-Borrego: Edge of Creation by Paul Remeika
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Some sources for the southernmost areas of California:
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unless and until there is a consensus to include them
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A discussion is taking place to address the redirect
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Photo says the San Andreas fault is "Clearly Visible"
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to determine whether its use and function meets the
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Knowledge (XXG) level-5 vital articles in Geography
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News Article: San Andreas Fault Longer Than Thought
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1487:. I would think this date accurate except a
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218:It is of interest to the following
23:for discussing improvements to the
2140:Top-importance California articles
2017:San Andreas Fault at Wallace Creek
1863:Policies and guideline for section
14:
1888:major fansite may be appropriate.
1553:Direction of plates is incorrect?
1437:There are sub-sections under the
509:San Francisco Bay Area task force
50:New to Knowledge (XXG)? Welcome!
2185:High-importance Geology articles
2130:WikiProject Earthquakes articles
1772:Vague writing- lack of timelines
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1432:Vague writing- lack of timelines
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293:WikiProject Earthquakes articles
290:Template:WikiProject Earthquakes
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45:Click here to start a new topic.
2175:WikiProject California articles
1738:until a consensus is reached.
1650:. The discussion will occur at
616:This article has been rated as
428:This article has been rated as
411:Template:WikiProject California
307:This article has been rated as
2105:C-Class level-5 vital articles
2075:07:58, 21 September 2024 (UTC)
1297:I have opened a discussion at
670:00:44, 29 September 2006 (UTC)
1:
1664:21:39, 20 December 2021 (UTC)
1407:00:24, 25 February 2014 (UTC)
1388:Use of newspapers as sources.
1380:00:08, 25 February 2014 (UTC)
1358:22:32, 19 February 2012 (UTC)
1342:21:34, 19 February 2012 (UTC)
723:{{Days elapsed times factor}}
506:This article is supported by
501:San Francisco Bay Area portal
466:This article is supported by
402:and see a list of open tasks.
281:and see a list of open tasks.
42:Put new text under old text.
2195:WikiProject Geology articles
2145:C-Class Los Angeles articles
1897:Minimize the number of links
1697:18:37, 4 November 2022 (UTC)
1412:Geography of the three zones
1189:Gulf of California Rift Zone
984:10:29, 28 January 2009 (UTC)
967:10:03, 28 January 2009 (UTC)
599:Template:WikiProject Geology
2135:C-Class California articles
1868:Around eight years overdue:
1786:, as a friend lived on the
1533:http://www.wgcep.org/UCERF3
1489:GeoScienceWorld publication
1171:20:21, 30 March 2011 (UTC)
1130:23:32, 3 January 2011 (UTC)
1100:03:31, 27 August 2011 (UTC)
1062:01:37, 11 August 2010 (UTC)
690:03:06, 11 August 2010 (UTC)
469:Los Angeles area task force
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1955:unrelated to its accuracy.
1629:23:45, 5 August 2020 (UTC)
1545:20:43, 22 April 2016 (UTC)
1523:14:21, 17 April 2016 (UTC)
1280:01:27, 27 March 2012 (UTC)
1252:22:55, 26 March 2012 (UTC)
1169:19:52, 30 March 2011 (UTC)
1044:23:13, 21 April 2010 (UTC)
1028:02:52, 14 April 2010 (UTC)
1005:15:12, 12 April 2010 (UTC)
893:17:23, 16 April 2008 (UTC)
876:23:53, 10 April 2008 (UTC)
622:project's importance scale
461:Greater Los Angeles portal
434:project's importance scale
313:project's importance scale
2042:The Day California Cracks
1370:. I recommend closing. ~
1216:is moving northwestwards.
1214:Baja California peninsula
1151:. And here is more info:
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856:19:49, 4 April 2008 (UTC)
837:00:39, 5 March 2008 (UTC)
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1721:The Big One (earthquake)
1708:Redirects for discussion
1704:The Big One (earthquake)
1648:The Big One (earthquake)
1636:Redirects for discussion
1609:20:09, 7 June 2019 (UTC)
1567:02:54, 29 May 2019 (UTC)
1311:00:10, 1 June 2011 (UTC)
655:21:34, 29 May 2006 (UTC)
1943:This page in a nutshell
1845:policies and guidelines
1760:08:27, 1 May 2024 (UTC)
1427:11:53, 6 May 2014 (UTC)
1208:that runs out into the
665:not recall exactly). -
262:WikiProject Earthquakes
2090:C-Class vital articles
2053:Interactive Google Map
2047:Bloomberg Businessweek
2031:July 20, 2012, at the
1181:San Jacinto Fault Zone
800:
782:The virtue of this is
767:Loma Prieta earthquake
574:Talk:San Andreas Fault
486:
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385:WikiProject California
345:San Francisco Bay Area
75:avoid personal attacks
1930:for discussion. Also
1819:a little bit of right
709:01:14, 22 June 2006 (
590:for more information.
485:
445:
212:on Knowledge (XXG)'s
205:level-5 vital article
100:Neutral point of view
1266:geology section and
1260:Brawley Seismic Zone
842:Plate motion vectors
725:, parses as follows:
105:No original research
1730:redirect guidelines
1724:has been listed at
1463:Cascadia connection
1445:sub-section states
1202:Imperial Fault Zone
1185:Elsinore Fault Zone
579:WikiProject Geology
414:California articles
2006:2020-01-30 at the
1952:Second paragraph,
1788:Bishop Reservation
1784:Bishop, California
1689:Community Tech bot
1614:"The next big one"
1210:Gulf of California
1206:Cerro Prieto Fault
707:User:ProfessorPaul
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214:content assessment
86:dispute resolution
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1453:The next "Big One
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19:This is the
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1964:Please note
1908:Do not use
1805:, possibly
1678:Eq-prob.jpg
1559:Memeosaurus
1332:Ron Crane
1264:Salton Sink
953:—Preceding
927:—Preceding
862:—Preceding
652:Will Beback
576:is part of
341:Los Angeles
284:Earthquakes
267:earthquakes
239:Earthquakes
148:free images
31:not a forum
2084:Categories
1821:somewhere.
1753:Contrib's.
1741:JWilz12345
1495:WGCEP 2014
1368:soapboxing
1366:It's just
1350:Mikenorton
1183:, and the
1141:Cajon Pass
1122:Mikenorton
1013:Uh oh.....
976:Mikenorton
819:to 65 cm.
682:Leonard G.
667:Leonard G.
405:California
395:California
390:U.S. state
336:California
271:seismology
1994:from the
1849:consensus
1815:hypomania
1593:|surname=
1485:3/10/2015
1395:wp:fringe
1334:Ron Crane
1258:See also
1193:spreading
1177:this page
1085:every day
208:is rated
88:if needed
71:Be polite
21:talk page
2029:Archived
2004:Archived
1948:article.
1913:cite web
1885:states:
1883:LINKFARM
1876:states:
1813:. Maybe
1581:|author=
1475:states:
1419:Valetude
1020:Brats817
955:unsigned
929:unsigned
885:Tmangray
864:unsigned
848:Tmangray
703:Oklahoma
56:get help
29:This is
27:article.
2065:. --
2010:at the
1796:history
1585:|first=
1491:states
1161:S. Rich
832:my talk
620:on the
593:Geology
584:geology
537:Geology
432:on the
311:on the
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