1992 Big Bear earthquake

1992 Big Bear earthquake
Los Angeles
Palm Springs
UTC time ??
ISC event
USGS-ANSS
Date * June 28, 1992 (1992-06-28)
Origin time * 15:05:33 UTC [1]
Local date
Local time
Magnitude 6.5 Mw [1]
Depth 3.1 miles (5 km) [2]
Epicenter 34°17′N 116°49′W / 34.29°N 116.82°W / 34.29; -116.82Coordinates: 34°17′N 116°49′W / 34.29°N 116.82°W / 34.29; -116.82 [2]
Type Strike-slip [2]
Areas affected Inland Empire
Southern California
United States
Total damage Moderate [3]
Max. intensity VIII (Severe) [4]
Foreshocks 5.2 Mw June 28 at 14:43 [5]
Aftershocks 5.3 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]
Casualties Some injuries [4]
* Deprecated  See documentation.

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]

This earthquake occurred three hours after the 7.3 magnitude Landers earthquake, which was centered 22 miles (35 km) to the east. The closely timed occurrence of these earthquakes is an often-cited example of a regional earthquake sequence.[7] 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.[8]

See also

References

  1. 1 2 ISC (19 January 2015), ISC-GEM Global Instrumental Earthquake Catalogue (1900–2009), Version 2.0, International Seismological Centre
  2. 1 2 3 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), Significant Earthquake Database, National Geophysical Data Center, NOAA, doi:10.7289/V5TD9V7K
  4. 1 2 USGS, M6.5 - Southern California, United States Geological Survey
  5. 1 2 3 4 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, Seismological Society of America, 85 (3): 690
  6. ↑ "Big Bear Earthquake". Southern California Earthquake Center. Retrieved May 23, 2012.
  7. ↑ Tom Parsons; Douglas S. Dreger (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" (PDF). Geophysical Research Letters. Retrieved September 4, 2011.
  8. ↑ LaMacchia, Diane (July 17, 1992). "Yucca Valley earthquake surprised experts". Lawrence Berkeley National Laboratory. Archived from the original on October 12, 2007. Retrieved November 4, 2007.


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