1992 Big Bear earthquake: Difference between revisions

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Coordinates: 34°17′N 116°49′W / 34.29°N 116.82°W / 34.29; -116.82
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The '''1992 Big Bear earthquake''' occurred at {{tooltip|08:05:33 PDT|15:0533 UTC}} on June 28 in [[Big Bear Lake, California]], with a [[Moment magnitude scale|moment magnitude]] of 6.5 and a maximum perceived intensity of VIII (''Severe'') on the [[Mercalli intensity scale]]. The earthquake occurred at a relatively shallow depth of {{convert|5|km|sp=us}} and caused landslides in the [[San Bernardino Mountains]].<ref>{{cite web|url=http://www.data.scec.org/significant/bigbear1992.html|title=Big Bear Earthquake|publisher=[[Southern California Earthquake Center]]|accessdate=May 23, 2012}}</ref>
The '''1992 Big Bear earthquake''' occurred at {{tooltip|08:05:33 PDT|15:0533 UTC}} on June 28 in [[Big Bear Lake, California]], with a [[Moment magnitude scale|moment magnitude]] of 6.5 and a maximum perceived intensity of VIII (''Severe'') on the [[Mercalli intensity scale]]. The earthquake occurred at a relatively shallow depth of {{convert|5|km|sp=us}} and caused landslides in the [[San Bernardino Mountains]].<ref>{{cite web|url=http://www.data.scec.org/significant/bigbear1992.html|title=Big Bear Earthquake|publisher=[[Southern California Earthquake Center]]|accessdate=May 23, 2012}}</ref>


The Big Bear earthquake happened just east of the "Big Bend" of the [[San Andreas Fault]], where it takes an offset towards [[Los Angeles]], and 3 hours 26 minutes after the M 7.3 [[1992 Landers earthquake]] occurred 22 miles (35 km) to the east. The Big Bear earthquake is considered an aftershock of the Landers earthquake, part of a complex pattern of regional stress adjustment that led to the [[1999 Hector Mine earthquake]].<ref>{{Cite journal
This earthquake occurred three hours after the 7.3 magnitude [[1992 Landers earthquake|Landers earthquake]], which was centered {{convert|22|mi|km}} to the east. The closely timed occurrence of these earthquakes is an often-cited example of a regional earthquake sequence.<ref>{{cite web|title=Static-stress impact of the 1992 Landers earthquake sequence on nucleation and slip at the site of the 1999 M=7.1 Hector Mine earthquake, southern California|author=Tom Parsons|author2=Douglas S. Dreger|url=https://profile.usgs.gov/myscience/upload_folder/ci2010May2518053242680Hector_Mine.pdf|year=2000|publisher=''[[Geophysical Research Letters]]''|accessdate=September 4, 2011}}</ref> Both earthquakes had occurred significantly close to the southern portion of the [[San Andreas Fault]], and the Landers event may have reduced the compressional stress in that area.<ref name="lbnl">{{cite news |first=Diane |last=LaMacchia |title=Yucca Valley earthquake surprised experts |url=http://www.lbl.gov/Science-Articles/Archive/yucca-valley-earthquake.html |publisher=[[Lawrence Berkeley National Laboratory]]|date=July 17, 1992 |accessdate=November 4, 2007| archiveurl= https://web.archive.org/web/20071012013512/http://lbl.gov/Science-Articles/Archive/yucca-valley-earthquake.html| archivedate= October 12, 2007 | deadurl= no}}</ref>
|first1= Tom |last1= Parsons
|first2= Douglas S. |last2= Dreger
|date= July 1, 2000
|title= Static-stress impact of the 1992 Landers earthquake sequence on nucleation and slip at the site of the 1999 M=7.1 Hector Mine earthquake, southern California
|journal= [[Geophysical Research Letters]]
|volume= 27 |issue= 13 |pages= 1949–1952
|url= https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/1999GL011272
}}
</ref>


==See also==
==See also==

Revision as of 23:10, 30 October 2018

1992 Big Bear earthquake
1992 Big Bear earthquake is located in California
Los Angeles
Los Angeles
Palm Springs
Palm Springs
1992 Big Bear earthquake
UTC time1992-06-28 15:05:33
ISC event289115
USGS-ANSSComCat
Local dateJune 28, 1992 (1992-06-28)
Local time08:05:33 PDT
Magnitude6.5 Mw [1]
Depth3.1 miles (5 km) [2]
Epicenter34°17′N 116°49′W / 34.29°N 116.82°W / 34.29; -116.82 [2]
TypeStrike-slip [2]
Areas affectedInland Empire
Southern California
United States
Total damageModerate [3]
Max. intensityVIII (Severe) [4]
Foreshocks5.2 Mw June 28 at 14:43 [5]
Aftershocks5.3 Mw  July 9 at 01:43 [5]
5.2 Mw  Nov 27 at 16:00 [5]
5.1 Mw  Dec 4 at 02:08 [5]
CasualtiesSome injuries [4]

The 1992 Big Bear earthquake occurred at 08:05:33 PDT on June 28 in Big Bear Lake, California, with a moment magnitude of 6.5 and a maximum perceived intensity of VIII (Severe) on the Mercalli intensity scale. The earthquake occurred at a relatively shallow depth of 5 kilometers (3.1 mi) and caused landslides in the San Bernardino Mountains.[6]

The Big Bear earthquake happened just east of the "Big Bend" of the San Andreas Fault, where it takes an offset towards Los Angeles, and 3 hours 26 minutes after the M 7.3 1992 Landers earthquake occurred 22 miles (35 km) to the east. The Big Bear earthquake is considered an aftershock of the Landers earthquake, part of a complex pattern of regional stress adjustment that led to the 1999 Hector Mine earthquake.[7]

See also

References

  1. ^ ISC (January 19, 2015), ISC-GEM Global Instrumental Earthquake Catalogue (1900–2009), Version 2.0, International Seismological Centre
  2. ^ a b c USGS (September 4, 2009), PAGER-CAT Earthquake Catalog, Version 2008_06.1, United States Geological Survey
  3. ^ National Geophysical Data Center / World Data Service (NGDC/WDS) (1972), Significant Earthquake Database, National Geophysical Data Center, NOAA, doi:10.7289/V5TD9V7K
  4. ^ a b USGS, M6.5 - Southern California, United States Geological Survey
  5. ^ a b c d Jones, L. E.; Hough, S. E. (1995), "Analysis of broadband records from the 28 June 1992 Big Bear earthquake: Evidence of a multiple-event source", Bulletin of the Seismological Society of America, 85 (3): 690
  6. ^ "Big Bear Earthquake". Southern California Earthquake Center. Retrieved May 23, 2012.
  7. ^ Parsons, Tom; Dreger, Douglas S. (July 1, 2000). "Static-stress impact of the 1992 Landers earthquake sequence on nucleation and slip at the site of the 1999 M=7.1 Hector Mine earthquake, southern California". Geophysical Research Letters. 27 (13): 1949–1952.

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