Historical seismicity in the South San Francisco Bay Region
Open-File Report
2008-1151
By: William H. Bakun
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Abstract
Locations (intensity centers) and moment magnitude M for 24 earthquakes (1858-1911) in the southern San Francisco Bay area are estimated from Modified Mercalli intensity (MMI) assignments. The uncertainties in location and M are generally large because there are few MMI assignments available. Preferred locations are selected to be consistent with a simple model for seismic activity on the central and southern Calaveras fault. Significant seismic activity can be explained by repetitive failure of the same fault areas in nearly identical earthquakes. Significant earthquake activity occurred on both east- and west-Bay faults in the ten or so years before the 1868 east-Bay earthquake and before the1906 and 1989 west-Bay earthquakes.
Suggested Citation
Bakun, W.H., 2008, Historical seismicity in the South San Francisco Bay Region (Version 1.1, revised 2009): U.S. Geological Survey Open-File Report 2008-1151, ii, 37 p., https://doi.org/10.3133/ofr20081151.
ISSN: 2331-1258 (online)
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Historical seismicity in the South San Francisco Bay Region |
| Series title | Open-File Report |
| Series number | 2008-1151 |
| DOI | 10.3133/ofr20081151 |
| Edition | Version 1.1, revised 2009 |
| Year Published | 2008 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Publisher location | Reston, VA |
| Contributing office(s) | Earthquake Hazards Program, Earthquake Science Center |
| Description | ii, 37 p. |
| Online Only (Y/N) | Y |
| Additional Online Files (Y/N) | Y |