1918 San Jacinto earthquake

1918 San Jacinto earthquake
The San Jacinto post office after the quake
1918 San Jacinto earthquake is located in California
Los Angeles
Los Angeles
San Diego
San Diego
1918 San Jacinto earthquake
UTC time1918-04-21 22:32:29
ISC event913126
USGS-ANSSComCat
Local dateApril 21, 1918 (1918-04-21)
Local time14:32:29
Magnitude6.7 Mw[1]
Depth10 km (6 mi)[1]
Epicenter33°45′00″N 116°53′00″W / 33.7500°N 116.8833°W / 33.7500; -116.8833[1]
FaultSan Jacinto Fault Zone
Total damage$200,000[2]
Max. intensityMMI IX (Violent)[3]
Casualties1 dead, several injured[4]

The 1918 San Jacinto earthquake occurred in extreme eastern San Diego County in Southern California on April 21 at 14:32:29 local time. The shock had a moment magnitude of 6.7 and a maximum Mercalli intensity of IX (Violent). Several injuries and one death occurred with total losses estimated to be $200,000.

Tectonic setting

The San Jacinto Fault Zone is a major strike-slip fault zone that runs through San Bernardino, Riverside, San Diego, and Imperial counties in Southern California. The SJFZ is a component of the larger San Andreas transform system and is considered to be the most seismically active fault zone in the area. Together they relieve the majority of the stress between the Pacific and North American tectonic plates.

Damage

Many of the buildings in San Jacinto's business district were of poor construction, and all but one frame building and one concrete building collapsed, though high-quality structures did not experience serious damage. Minor damage to other buildings within 160 kilometers (99 mi) of San Jacinto also occurred. Roadways and irrigation canals also sustained damage and small sand blows were seen on a farm northwest of San Jacinto.[4]

The earthquake occurred on a Sunday afternoon when most of the businesses in San Jacinto were closed and void of customers. The business district had the greatest damage, though Hemet was also severely damaged. Damage to chimneys, windows, and plaster walls occurred to buildings and structures within 100 miles (160 km) of San Jacinto. Some of the damage that was inspected included landslides, partially collapsed buildings, and damaged irrigation canals and roads. Ground cracks were observed near the banks of the San Jacinto River.[5]

See also

References

  1. ^ a b c ISC (2017), ISC-GEM Global Instrumental Earthquake Catalogue (1900–2013), Version 4.0, International Seismological Centre
  2. ^ National Geophysical Data Center / World Data Service (NGDC/WDS) (1972), Significant Earthquake Database (Data Set), National Geophysical Data Center, NOAA, doi:10.7289/V5TD9V7K
  3. ^ PAGER-CAT Earthquake Catalog, Version 2008_06.1, United States Geological Survey, September 4, 2009, archived from the original on 2020-03-13
  4. ^ a b Stover, C. W.; Coffman, J. L. (1993), Seismicity of the United States, 1568–1989 (Revised), U.S. Geological Survey professional paper 1527, United States Government Printing Office, pp. 76, 122
  5. ^ Townley, S. D. (1918), "The San Jacinto earthquake of April 21, 1918", Bulletin of the Seismological Society of America, VIII (2–3), Seismological Society of America: 45–52, Bibcode:1918BuSSA...8...45T, doi:10.1785/BSSA0080020045, S2CID 133342475

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