1957 San Francisco earthquake

Earthquake in California, US May 2025 February 2025 1957 San Francisco earthquake 886234 iscgem886234 USA California yes California 39.22 -123.77 Albion 100 top Green pog.svg California 38.8 -121.72 Knights Landing 100 top Green pog.svg California 38.21 -120.94 Camanche 100 Green pog.svg California 37.26 -121.0 Gustine 100 Green pog.svg California 36.57 -121.52 Chualar bottom 100 Green pog.svg California 37.56 -122.73 Bullseye1.png 40 top 250 right 1957-03-22 19:44:22 1957 03 22 11:44:22 PST 5.7 Mw 15 km mi on 37.5572 -122.7239 type:event_region:US inline, title Oblique-slip San Francisco Bay Area Northern California United States $1 million VII 0.18 g Yes 1 dead, 40 injured The 1957 San Francisco earthquake (also known as the Daly City earthquake of 1957) occurred on March 22 at 11:44:22 local time with a moment magnitude of 5.7 and a maximum Mercalli Intensity of VII (Very strong). It was located just off the San Francisco Peninsula near the San Andreas Fault and was felt in a limited portion of Northern and Central California. There was a non-destructive foreshock and aftershock sequence that lasted for several months. With financial losses of around US$1 million, damage was considered minimal, with one death and forty injuries. Tectonic setting The San Andreas Fault System (SAFS) is a collection of faults that accommodates differential motion between the Pacific and North American plates and extends from the Mendocino triple junction in the north to the Salton Sea in the south. While the majority of movement occurs as right-lateral strike-slip on the significant branches of the system, including the San Jacinto and Hayward faults that are relatively near the main San Andreas Fault, other types of faults (including left-lateral strike-slip, reverse, thrust, and to a lesser extent, normal) are also present. These various fault types have been observed well east into the Basin and Range Province.The San Andreas Fault System, California – USGS Professional Paper 1515 https://pubs.usgs.gov/pp/1990/1515/ General Features R. E. Wallace United States Geological Survey 1990 978-0607716269 3–8 Earthquake Eight foreshocks (with a maximum magnitude of 3.8) preceded the main event. The first motion method was used to determine the focal mechanism of the mainshock. It was found to be dissimilar from the strike-slip movement of the 1906 earthquake, and instead showed oblique movement on a steeply-dipping thrust fault, with the eastern side of the fault rising relative to the western side. The strike-slip component was minimal and was only about half as much as the thrust component.San Francisco earthquakes of March 1957 Seismographic Results from the 1957 San Francisco Earthquakes https://archive.org/details/sanfranciscoeart57oake D. Tocher 1959 Special Report 57 California Division of Mines 61, 65, 70, 71 Damage Damage was non-structural and was limited to content within buildings and cracked plaster and was estimated at $1 million, not including loss to building content. The most significant effects were seen in the western portion of Daly City and in the Lake Merced area of San Francisco. The minimal losses were attributed to the short duration and lack of high intensity shaking.San Francisco earthquakes of March 1957 Damage to Buildings and Other Structures During the San Francisco Earthquake of March 22, 1957 https://archive.org/details/sanfranciscoeart57oake K. V. Steinbrugge V. R. Bush E. G. Zacher 1959 Special Report 57 California Division of Mines 75, 76 Strong motion The event was felt over an area of 12,000 square miles. Its scientific value was reinforced because it was captured on 13 strong motion instruments. A maximum (free field) peak ground acceleration of 0.13 g was recorded in Golden Gate Park and .18 g was recorded on the fourteenth floor of a building in San Francisco.San Francisco earthquakes of March 1957 Intensity and Ground Motion of the San Francisco Earthquake of March 22, 1957 https://archive.org/details/sanfranciscoeart57oake W. K. Cloud 1959 Special Report 57 California Division of Mines 51, 52 See also List of earthquakes in 1957 List of earthquakes in California List of earthquakes in the United States References ISC-GEM Global Instrumental Earthquake Catalogue (1900–2009) https://www.isc.ac.uk/iscgem/index.php ISC 2015 International Seismological Centre Version 2.0 Stover C. W. Coffman J. L. Seismicity of the United States, 1568–1989 (Revised) U.S. Geological Survey Professional Paper 1527 https://books.google.com/books?id=bY0KAQAAIAAJ 1993 United States Government Printing Office 88, 150 External links M 5.7 – offshore Northern California – United States Geological Survey The Daly City Earthquake of 1957: What Does it Tell Us? – San Francisco Historical Society 886234 Category:Earthquakes in California Category:1957 earthquakes Category:March 1957 in the United States Category:History of the San Francisco Bay Area Category:1957 in California Category:1957 natural disasters in the United States