1838 San Andreas earthquake

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1838 San Andreas earthquake
1838 San Andreas earthquake is located in California
San Francisco
San Francisco
1838 San Andreas earthquake
Local date June 1838 (1838-06)
Magnitude 6.8–7.2 Mw [1]
Epicenter 37°18′N 122°09′W / 37.30°N 122.15°W / 37.30; -122.15Coordinates: 37°18′N 122°09′W / 37.30°N 122.15°W / 37.30; -122.15 (approximate)[2]
Areas affected San Francisco Bay Area
Northern California
United States
Max. intensity VIII (Severe) [3]
Casualties Unknown

The 1838 San Andreas earthquake is believed to be a rupture along the northern part of the San Andreas Fault in June 1838,[1][4] it affected approximately 100 km (62 miles) of the fault, from the San Francisco Peninsula to the Santa Cruz Mountains.[1] It was a strong earthquake, with an estimated moment magnitude of 6.8 to 7.2,[1] making it one of the largest known earthquakes in California. The region was lightly populated at the time, although structural damage was reported in San Francisco, Oakland, and Monterey.[1][5][6] It is unknown whether there were fatalities. Based on geological sampling, the fault created approximately 1.5 meters (5.0 feet) of slip.[1]

For years, another large earthquake was said to have occurred two years earlier on June 10, 1836 along the Hayward fault,[7] however this is now believed to be referring to the 1838 San Andreas earthquake.[8] There is no evidence a large earthquake hit the region in 1836.[8]

See also[edit]


  1. ^ a b c d e f Streig, A. R.; Dawson, T. E.; Weldon II, R. J. (2014), "Paleoseismic Evidence of the 1890 and 1838 Earthquakes on the Santa Cruz Mountains Section of the San Andreas Fault, near Corralitos, California", Bulletin of the Seismological Society of America, Seismological Society of America, 104 (1): 285–300, Bibcode:2014BuSSA.104..285S, doi:10.1785/0120130009 
  2. ^ "Anniversaries of Notable California Earthquakes". California Geological Survey. Retrieved 24 October 2016. 
  3. ^ 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, p. 72 
  4. ^ Schwartz, D. P.; Lienkaemper, J. J.; Hecker, S.; Kelson, K. I.; Fumal, T. E.; Baldwin, J. N.; Seitz, G. G.; Niemi, T. M. (2014), "The Earthquake Cycle in the San Francisco Bay Region: A.D. 1600–2012" (PDF), Bulletin of the Seismological Society of America, Seismological Society of America, 104 (3): 1299–1328, Bibcode:2014BuSSA.104.1299S, doi:10.1785/0120120322 
  5. ^ Kovach, Robert L. (2004). Early Earthquakes of the Americas. Cambridge University Press. p. 148. 
  6. ^ "Historic Earthquakes". U.S. Geological Survey. 
  7. ^ Coffman, Jerry L.; von Hake, Carl A. Earthquake History of the United States (PDF). National Oceanic and Atmospheric Administration. p. 138. 
  8. ^ a b Toppozada, T. R.; Borchardt, G. (1998), "Re-evaluation of the 1836 "Hayward fault" and the 1838 San Andreas fault earthquakes", Bulletin of the Seismological Society of America, Seismological Society of America, 88 (1): 140–159 

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