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221:] down a rock shelf for 600 feet at an angle of 50 degrees from vertical and acquired sufficient speed to free-fall ballistically an estimated 1800 feet (550 m) prior to impacting about 200 feet (60 m) from the base of the cliff in the Happy Isles area of the valley floor in Yosemite National Park (field investigation with Gerald Wieczorak and Richard Waitt).
243:
The force of the impacts was comparable to a 2.15-magnitude earthquake. The impacts also triggered the formation of a massive dust cloud. One witness "noted that the sky went black for six minutes as the dust raised by the cloud blocked out the late afternoon light." The rock fall also caused the
180:
in
Yosemite to date. The earthquake caused by the rock slide was followed almost immediately by a sonic boom. Soon afterward a granite dust mushroom cloud formed over Happy Isles. The immense pressure created at the base of the rock slide blew down giant pine trees as if they were nothing.
244:
uprooting or damage of about 1,000 trees in the immediate blast zone. Structures damaged by the snapping of these trees included the Happy Isles Nature Center, a snack bar, and a bridge. On the day of the incident, the park was hosting as many as 20,000 visitors.
190:
At 6:52 pm PDT Wednesday, July 10, 1996, a large block of granite, with an estimated volume of 78,000 cubic yards, detached from the cliff between
Washburn Point and Glacier Point, in Yosemite Valley.
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320:
Wieczorek, Gerald F.; Snyder, James B.; Waitt, Richard B.; Morrissey, Meghan M.; Uhrhammer, Robert A.; Harp, Edwin L.; Norris, Robert D.; Bursik, Marcus I.; Finewood, Lee G. (2000).
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356:"Air blasts generated by rockfall impacts: Analysis of the 1996 Happy Isles event in Yosemite National Park"
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Afterwards the nearby campground tables and trees were covered with a thick coat of granite dust.
161:. 162,000 tons of rocks and other debris fell to the ground at over 160 miles per hour. Of the 12
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397:"Huge Rock Slide in Yosemite – 1 Killed / Several Injured as slab plunges into Happy Isles area"
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322:"Unusual July 10, 1996, rock fall at Happy Isles, Yosemite National Park, California"
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involved in the incident, one was killed. The landslide competes with the
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Appalachian Long
Distance Hikers Association|ALDHA Landslide at Yosemite
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National
Register of Historic Places in Yosemite National Park
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After detaching from the cliff, the rock mass slide [
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10.1130/0016-7606(2000)112<0075:ujrfah>2.3.co;2
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162,000 tons of debris fell at speeds of up to 160 mph
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Stephen
Schwartz & Teresa Moore (July 11, 1996).
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360:Journal of Geophysical Research: Solid Earth
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1115:1996 natural disasters in the United States
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440:
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296:"The Yosemite Rock Fall of July 10, 1996"
203:The first impact occurred at 18:52:28.0
270:
1125:History of Mariposa County, California
329:Geological Society of America Bulletin
294:Robert Uhrhammer (December 10, 1996).
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313:
7:
141:occurred on July 10, 1996, near the
774:Steck-Salathé Route (Sentinel Rock)
997:El Portal & Arch Rock Entrance
14:
1105:Geology of Yosemite National Park
176:for the designation of the worst
1135:Deaths in Yosemite National Park
490:Mariposa Grove of Giant Sequoias
1130:Landslides in the United States
1120:Natural disasters in California
226:UC Berkeley Seismograph Station
908:1996 Yosemite Valley landslide
20:1996 Yosemite Valley Landslide
1:
1064:Geology of the Yosemite area
1059:History of the Yosemite area
236:One of the impacts killed a
857:Yosemite Lodge at the Falls
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31:Aftermath of the landslide
767:Salathé Wall (El Capitan)
730:Half Dome, Northwest Face
723:Fairview Dome, North Face
629:
24:
354:Morrissey M. M. (1999).
913:1997 Merced River flood
903:1938 Yosemite TWA crash
401:San Francisco Chronicle
254:1997 Merced River flood
170:1997 Merced River flood
40:July 10, 1996
1110:Yosemite National Park
923:2022 Washburn Wildfire
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623:Yosemite Valley Chapel
603:Little Yosemite Valley
449:Yosemite National Park
229:
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151:Yosemite National Park
788:The Nose (El Capitan)
635:
205:Pacific Daylight Time
744:Lost Arrow Spire Tip
381:10.1029/1999JB900189
372:1999JGR...10423189M
198:Seismograph Station
94: /
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1145:1996 in California
1140:Landslides in 1996
1074:List of waterfalls
839:Ahwahnechee people
760:Royal Arches Route
753:Midnight Lightning
637:
613:Bracebridge Dinner
98:37.729°N 119.561°W
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1084:California Portal
1079:Yosemite Category
918:2013 Rim Wildfire
896:Natural disasters
882:High Sierra Camps
877:Housekeeping Camp
814:Stephen T. Mather
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618:Yosemite Firefall
240:near the cliffs.
174:2013 Rim wildfire
129:
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16:Natural landslide
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938:Nearby airports
829:Buffalo Soldiers
781:Separate Reality
737:Lost Arrow Spire
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470:Yosemite Village
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56:Yosemite Valley
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834:Chief Tenaya
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699:Wapama Falls
565:To the Limit
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475:Hetch Hetchy
406:December 29,
404:. Retrieved
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335:(1): 75–85.
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302:December 29,
300:. Retrieved
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132:
130:
1052:information
850:and camping
819:Galen Clark
689:Alder Creek
598:Nevada Fall
593:Vernal Fall
583:Mirror Lake
578:Happy Isles
523:attractions
505:Wawona Tree
485:Badger Pass
457:Attractions
259:Happy Isles
196:UC Berkeley
143:Happy Isles
101: /
89:119°33′40″W
76:Coordinates
1099:Categories
1050:Additional
1041:Lee Vining
1006:Chinquapin
867:Camp Curry
679:Taft Point
659:Mist Trail
588:North Dome
547:El Capitan
540:El Capitan
500:Tioga Pass
265:References
207:(02:52:28
159:California
86:37°43′44″N
44:1996-07-10
1026:Briceburg
974:Route 120
964:Route 140
809:John Muir
559:Free Solo
530:Half Dome
138:landslide
1036:Midpines
1031:Oakhurst
1021:Mariposa
1016:Bootjack
969:Route 41
248:See also
224:—
193:—
172:and the
52:Location
992:Foresta
848:Lodging
544:Films:
368:Bibcode
232:Effects
185:Impacts
166:/hikers
163:campers
42: (
1011:Wawona
1004:&
983:Nearby
887:Camp 4
802:People
715:climbs
646:trails
644:Hiking
520:Valley
122:Deaths
959:YARTS
713:Rock
325:(PDF)
238:hiker
133:1996
114:Cause
408:2013
304:2013
131:The
37:Date
952:MMH
947:MPI
942:FAT
376:doi
364:104
337:doi
333:112
218:sic
209:UTC
60:YNP
1101::
562:,
556:,
550:,
399:.
374:.
362:.
358:.
331:.
327:.
312:^
284:^
157:,
153:,
149:,
68:CA
66:,
62:,
58:,
441:e
434:t
427:v
410:.
384:.
378::
370::
343:.
339::
306:.
125:1
46:)
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
