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of more than 300 small to moderate earthquakes occurred with the largest two reaching a maximum of 5.3 and 5.5. Some light cosmetic damage was found on some older buildings in downtown
Brawley. Earthquake swarms are not unusual for the area. In 2005, also near Brawley, there was a swarm with a peak
400:
magnitude of 5.1, while in 1981 a swarm included one quake which was measured at 5.8. The swarm activity is not understood completely, but the new restlessness could generate data that will help scientists to gain a better understanding of the region. According to a geologist at the
422:
of southern
California experiences high rates of seismicity with a pronounced portion of the activity occurring within the Brawley Seismic Zone that separates the San Andreas fault to the north and the Imperial fault to the south. The Imperial fault was the source of the
439:
to an area south of
Brawley and the BSZ was found to have ruptured, with surface cracks, for a length of 13 km (8.1 mi). The 1940 and 1979 mainshocks were of similar size and both were followed by damaging aftershocks near Brawley.
404:(USGS), such swarms are typical for the Brawley zone: "The area sees lots of events at once, with many close to the largest magnitude, rather than one main shock with several much smaller aftershocks."
1542:
1233:
562:"Age constraints for the present fault configuration in the Imperial Valley, California â Evidence for northwestward propagation of the Gulf of California rift system"
2020:
1226:
1984:
2025:
784:
513:
1562:
1147:
739:
Fault
History and Architecture of the Southernmost San Andreas Fault and Brawley Seismic Zone: New Constraints from CHIRP Data Acquired in the Salton Sea
753:
1219:
1242:
1371:
2010:
1185:
1512:
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activity within the zone. The
Brawley Seismic Zone has been interpreted as an "onshore spreading center" which runs diagonally across the
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891:
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253:
Brawley
Seismic Zone and surrounding area. The red lines are simplified faults. Right-lateral direction of motion of the
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694:"Recent and long-term behavior of the Brawley Fault Zone, Imperial Valley, California: An escalation of slip rate?"
573:
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1502:
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1402:
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424:
337:
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The
Brawley Seismic Zone represents the northernmost extension of the spreading center axis associated with the
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Hauksson, E.; Stock, J.; Bilham, R.; Boese, M.; Chen, X.; Fielding, E. J.; Galetzka, J.; Hudnut, K. W.;
319:
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associated with the 1979 event along the northwest trending
Imperial fault from just north of the
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663:"Report on the August 2012 Brawley Earthquake Swarm in Imperial Valley, Southern California"
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661:; Shearer, P. M.; Steidl, J.; Treiman, J.; Weia, S.; Yang, W. (MarchâApril 2013),
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846:
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131:
41:
804:
793:
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613:
368:
345:
95:
462:"Lithospheric structure and tectonics from seismic-refraction and other data"
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514:""Earthquake storm" continues to rattle Imperial County, surrounding areas"
372:
77:
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are on the north margin of the
Brawley Seismic Zone and are linked to
352:
in Baja
California. Other major locations along the axis include the
341:
310:, and the seismicity there is characterized by earthquake swarms.
333:
1215:
766:
618:
Earthquakes: 2006 Centennial Update â The 1906 Big One
348:
taking place at southern California's Salton Sea and at
692:
Meltzner, A J.; Rockwell, T. K.; Owen, L. A. (2006),
360:(a submarine depression in the Gulf of California).
1957:
1771:
1395:
1249:
1108:
990:
832:
811:
544:"Series of earthquakes rattle Southern California"
431:. There was more than 30 km (19 mi) of
754:August 2012 Brawley, California Earthquake Swarm
701:Bulletin of the Seismological Society of America
741:â American Geophysical Union, Fall Meeting 2006
1227:
778:
468:, Geological Survey Professional Paper 1515,
213:
8:
231:
141:
302:. The BSZ is named for the nearby town of
290:that connects the southern terminus of the
257:is shown (pink arrows). The red rhombs are
1234:
1220:
1212:
1148:Rescue Lineament-Bear Mountains fault zone
785:
771:
763:
195:
597:
560:Larsen, Shawn; Reilinger, Robert (1991).
460:Fuis, Gary S.; Mooney, Walter D. (1990),
123:
466:The San Andreas Fault System, California
449:
2021:Geology of Imperial County, California
1979:
455:
453:
261:; the northern one is the site of the
159:
7:
1010:Clayton-Marsh Creek-Greenville Fault
745:List of all events for Brawley Swarm
749:Southern California Seismic Network
33:
2026:Natural history of Baja California
87:
14:
414:List of earthquakes in California
51:
1243:Earthquakes in the United States
1163:Sierra Nevada-Great Valley Block
709:Seismological Society of America
678:Seismological Society of America
512:Sewell, Abby (August 26, 2012).
230:
212:
194:
176:
158:
140:
122:
104:
86:
69:
68:
50:
32:
24:
18:
758:United States Geological Survey
566:Journal of Geophysical Research
470:United States Geological Survey
429:1979 Imperial Valley earthquake
402:United States Geological Survey
356:located south of Mexicali, and
105:
670:Seismological Research Letters
485:"Geology of the Salton Trough"
328:which runs up the axis of the
1:
892:Northridge Blind Thrust Fault
492:Western Washington University
354:Cerro Prieto spreading center
2011:Seismic faults of California
1191:California Geological Survey
177:
1196:Seismic Hazards Mapping Act
927:San Diego Trough Fault Zone
437:MexicoâUnited States border
308:Imperial County, California
2057:
1138:Maria fold and thrust belt
574:American Geophysical Union
411:
367:on the south shore of the
340:away from the mainland of
317:
1904:2018 Southern Appalachian
1181:
1045:Mount Diablo Thrust Fault
1040:Mendocino Triple Junction
622:W. H. Freeman and Company
425:1940 El Centro earthquake
338:Baja California Peninsula
332:and is in the process of
288:extensional tectonic zone
2016:Seismic faults of Mexico
1292:1812 San Juan Capistrano
1123:Furnace Creek Fault Zone
391:On August 26, 2012 near
1924:2020 Monte Cristo Range
1673:1986 North Palm Springs
1528:1948 Desert Hot Springs
1153:Sierra Nevada Batholith
1118:Death Valley Fault Zone
1035:Mendocino Fracture Zone
962:Sierra Madre Fault Zone
947:Santa Maria River Fault
887:NewportâInglewood Fault
483:David L. Alles (2011).
263:Niland geothermal field
1975:2010â11 Guy-Greenbrier
1548:1957 Andreanof Islands
1372:1892 VacavilleâWinters
1317:1867 Manhattan, Kansas
1000:Bartlett Springs Fault
942:San Jacinto Fault Zone
1985:2009âpresent Oklahoma
1874:2014 Southeast Alaska
1869:2014 Aleutian Islands
1683:1987 Whittier Narrows
1593:1968 Borrego Mountain
1543:1954 Churchill County
1518:1946 Aleutian Islands
1513:1944 CornwallâMassena
1413:1906 Aleutian Islands
1257:1585 Aleutian Islands
1128:Honey Lake Fault Zone
932:San Felipe Fault Zone
320:Extensional tectonics
286:, is a predominantly
282:), also known as the
222:Colorado River Valley
1834:2010 Baja California
1688:1987 Imperial Valley
1678:1986 Chalfant Valley
1638:1979 Imperial Valley
1433:1915 Pleasant Valley
1428:1915 Imperial Valley
842:Brawley Seismic Zone
276:Brawley Seismic Zone
250:class=notpageimage|
240:Cerro Prieto volcano
150:Colorado River mouth
2031:Brawley, California
1914:2020 Salt Lake City
1859:2013 Port Alexander
1799:2006 Gulf of Mexico
1713:1992 Cape Mendocino
1478:1932 Cedar Mountain
1347:1872 North Cascades
1158:Sierra Nevada Fault
992:Northern California
882:Laguna Salada Fault
877:Imperial Fault Zone
852:Elsinore Fault Zone
834:Southern California
717:2006BuSSA..96.2304M
582:1991JGR....9610339L
576:: 10, 339â10, 340.
542:(August 26, 2012).
344:, with significant
300:Southern California
265:, the southern the
2036:Gulf of California
1919:2020 Central Idaho
1738:1993 Klamath Falls
1553:1957 San Francisco
1508:1940 New Hampshire
1488:1934 Hansel Valley
1458:1925 Santa Barbara
1448:1921 Sevier Valley
1408:1906 San Francisco
1367:1892 Laguna Salada
1297:1812 Santa Barbara
1287:1811â12 New Madrid
1262:1638 New Hampshire
1143:Owens Valley Fault
1090:Silver Creek Fault
1070:San Gregorio Fault
1020:Hayward Fault Zone
922:San Cayetano Fault
902:Puente Hills Fault
857:Elysian Park Fault
794:Seismically active
725:10.1785/0120050233
686:10.1785/0220120169
620:(Fifth ed.),
472:, pp. 207â236
330:Gulf of California
284:Brawley fault zone
204:Gulf of California
1998:
1997:
1733:1993 Scotts Mills
1703:1991 Sierra Madre
1618:1975 Near Islands
1608:1971 San Fernando
1573:1962 Cache Valley
1418:1909 Wabash River
1352:1882 Fort Collins
1342:1872 Owens Valley
1209:
1208:
1133:Kern Canyon Fault
1050:Monta Vista Fault
982:Yorba Linda Fault
937:San Gabriel Fault
912:Rose Canyon Fault
897:Peninsular Ranges
819:San Andreas Fault
590:10.1029/91jb00618
519:Los Angeles Times
387:Earthquake swarms
326:East Pacific Rise
292:San Andreas Fault
269:geothermal field.
259:pull-apart basins
132:Alamo River mouth
2048:
1814:2008 Chino Hills
1758:1999 Hector Mine
1708:1992 Joshua Tree
1693:1989 Loma Prieta
1668:1984 Morgan Hill
1648:1981 Westmorland
1633:1979 Coyote Lake
1588:1965 Puget Sound
1583:1965 Rat Islands
1568:1959 Hebgen Lake
1538:1952 Kern County
1443:1918 San Jacinto
1387:1899 San Jacinto
1382:1898 Mare Island
1302:1838 San Andreas
1236:
1229:
1222:
1213:
1168:Smartville Block
1060:Pleasanton Fault
1055:Nacimiento Fault
1025:Healdsburg Fault
972:White Wolf Fault
952:Santa Ynez Fault
812:Statewide Faults
787:
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1990:2019 Ridgecrest
1953:
1949:2024 New Jersey
1909:2019 Ridgecrest
1879:2014 South Napa
1804:2006 Kiholo Bay
1794:2003 San Simeon
1767:
1763:2000 Yountville
1753:1998 Pymatuning
1743:1994 Northridge
1728:1992 St. George
1658:1983 Borah Peak
1613:1973 Point Mugu
1603:1969 Santa Rosa
1563:1958 Lituya Bay
1498:1936 State Line
1483:1933 Long Beach
1391:
1377:1895 Charleston
1357:1886 Charleston
1332:1870 Charlevoix
1307:1857 Fort Tejon
1282:1783 New Jersey
1267:1663 Charlevoix
1245:
1240:
1210:
1205:
1177:
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1100:West Napa Fault
1080:Seal Cove Fault
1075:San Pablo Fault
1065:Rinconada Fault
1005:Calaveras Fault
986:
957:Shoreline Fault
867:Hollywood fault
828:
807:
801:tectonic blocks
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733:External links
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631:978-0716775485
630:
624:, p. 61,
605:
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408:Other activity
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296:Imperial Fault
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1884:2016 Oklahoma
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1864:2014 La Habra
1862:
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1854:2011 Oklahoma
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1849:2011 Virginia
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1844:2011 Colorado
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1809:2008 Illinois
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1748:1995 Marathon
1746:
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1726:
1724:
1723:1992 Big Bear
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1653:1983 Coalinga
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1438:1916 Irondale
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1277:1755 Cape Ann
1275:
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1272:1700 Cascadia
1270:
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1201:Mexico (list)
1199:
1197:
1194:
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1189:
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1174:
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1110:Sierra Nevada
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1056:
1053:
1051:
1048:
1046:
1043:
1041:
1038:
1036:
1033:
1031:
1030:Maacama Fault
1028:
1026:
1023:
1021:
1018:
1016:
1015:Concord Fault
1013:
1011:
1008:
1006:
1003:
1001:
998:
997:
995:
993:
989:
983:
980:
978:
975:
973:
970:
968:
967:Ventura Fault
965:
963:
960:
958:
955:
953:
950:
948:
945:
943:
940:
938:
935:
933:
930:
928:
925:
923:
920:
918:
917:Salton Trough
915:
913:
910:
908:
907:Raymond Fault
905:
903:
900:
898:
895:
893:
890:
888:
885:
883:
880:
878:
875:
873:
870:
868:
865:
863:
862:Garlock Fault
860:
858:
855:
853:
850:
848:
845:
843:
840:
839:
837:
835:
831:
825:
822:
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816:
814:
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795:
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783:
781:
776:
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769:
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759:
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746:
743:
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736:
732:
726:
722:
718:
714:
711:: 2304â2328,
710:
706:
702:
695:
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687:
683:
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671:
664:
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623:
619:
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600:
595:
591:
587:
583:
579:
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563:
556:
553:
550:
549:
548:The Oklahoman
545:
541:
536:
533:
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520:
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508:
505:
497:September 30,
493:
486:
479:
476:
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467:
463:
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443:
441:
438:
434:
430:
426:
421:
415:
407:
405:
403:
398:
394:
386:
384:
382:
381:Salton Trough
378:
374:
370:
366:
365:Salton Buttes
361:
359:
355:
351:
350:Laguna Salada
347:
343:
339:
335:
331:
327:
321:
313:
311:
309:
305:
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297:
293:
289:
285:
281:
277:
268:
264:
260:
256:
251:
242:
241:
224:
223:
206:
205:
188:
187:
170:
169:
168:Laguna Salada
152:
151:
134:
133:
116:
115:
98:
97:
80:
79:
62:
61:
44:
43:
27:
21:
1980:2012 Brawley
1934:2021 Chignik
1839:2010 Indiana
1789:2003 Alabama
1772:21st century
1718:1992 Landers
1533:1949 Olympia
1453:1925 Montana
1396:20th century
1327:1868 Hayward
1312:1865 Memphis
872:Hosgri Fault
841:
704:
700:
673:
669:
659:Kanamori, H.
655:Jones, L. M.
641:
640:
617:
608:
569:
565:
555:
546:
535:
523:. Retrieved
517:
507:
495:. Retrieved
478:
465:
417:
390:
362:
358:Wagner Basin
323:
283:
279:
275:
273:
267:Cerro Prieto
238:
220:
202:
184:
166:
148:
130:
112:
94:
76:
58:
40:
1929:2020 Sparta
1894:2018 Hawaii
1889:2018 Alaska
1829:2010 Eureka
1784:2002 Denali
1698:1990 Upland
1663:1983 Kaoiki
1643:1980 Eureka
1628:1975 Hawaii
1623:1975 Morris
1578:1964 Alaska
1558:1958 Huslia
1493:1935 Helena
1473:1932 Eureka
1463:1927 Lompoc
1362:1887 Sonora
1337:1871 LÄnaÊ»i
1322:1868 Hawaii
1173:Walker Lane
1095:Tesla Fault
1085:Serra Fault
847:Chino Fault
797:fault zones
680:: 177â189,
614:Bolt, Bruce
42:Los Angeles
2005:Categories
1965:2001 Enola
1944:2023 Texas
1824:2008 Wells
1250:Historical
805:California
651:Hutton, K.
525:August 26,
444:References
412:See also:
377:geothermal
369:Salton Sea
346:subsidence
318:See also:
96:Salton Sea
1970:2008 Reno
1819:2008 Reno
1423:1914 Reno
294:with the
60:San Diego
1186:Category
427:and the
373:volcanic
78:Mexicali
713:Bibcode
642:Sources
578:Bibcode
393:Brawley
334:rifting
314:Geology
304:Brawley
114:Tijuana
1958:Swarms
628:
572:(B6).
342:Mexico
707:(6),
697:(PDF)
676:(2),
666:(PDF)
488:(PDF)
397:swarm
799:and
626:ISBN
527:2012
499:2012
418:The
395:, a
375:and
363:The
336:the
274:The
186:Yuma
803:of
721:doi
682:doi
594:hdl
586:doi
306:in
298:in
280:BSZ
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278:(
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