Daly City Earthquake
Archive: In Memory of Manuel G. (“Doc”) Bonilla (1920-2007)
1957 March 22, 1957 at 37.67N
122.48W Mw=5.3, Daly City,
The Daly City
earthquake of March 22, 1957 was the
largest event on the northern San Francisco
peninsula since 1906. Its magnitude is about 5.3, and damage to the dwellings
was limited to mostly plaster cracking. It drew attention right away because
it occurred about 20 km from the epicenter of the 1906 San
Francisco earthquake. Several eminent geologists,
earthquake engineers and seismologists investigated this earthquake,
including Gorden B. Oakshott,
M.G. Bonilla, Don Tocher, C.A. Whitten, Karl V. Steinbrugge, D.E. Hudson, and G.W. Housner
(Calif. Div. Mines, Special Report 57, 1959; see also Marsden
et al., 1995).
We welcome contributions of digital files of materials relating to the 1957 Daly
City earthquake and financial donations to the
endowment fund so that more seismograms can be scanned and made available
online. If you are interested, please contact W.H.K. Lee at <email@example.com>
(office) or <firstname.lastname@example.org> (home).
Archivist: Michael F. Diggles
(email@example.com). Endowment Donors: Porter Irwin, Willie
Lee, Art McGarr, Mike Rymer, Carol & Carl Wentworth,
and Kurt Servos (for providing funds to scan seismograms). Contributor of Files: Michael Diggles.
3. Reference: Oakeshott, G.(ed.),The San
Francisco Earthquakes of March 1957 , CDMG
Special Report 57, 1959.
4. A Brief Note about M.G. “Doc” Bonilla
Doc Bonilla is a
geologist noted for his field studies of active faults and their
seismic hazards. He identified
aspects of surface faulting and related earthquakes that are important in
engineering applications and risk evaluation, then compiled, analyzed, and
summarized the pertinent information in cooperation with others.
He also published a paper on the geologic observations in the
epicentral area of the 1957 earthquake (Bonilla, 1959).
He was educated at the
(A.B., Geology, 1943), and
(M.S., Geology, 1960). He served as a research
geologist of the U.S. Geological Survey from 1947 to 1993 and became a
geologist emeritus in 1994.
Please click: Biographical
Sketch for M.G. Bonilla for a 1-page bio-summary written by Doc
himself for the International Handbook of Earthquake and Engineering
Seismology, edited by W.H.K. Lee, H. Kanamori,
P.C. Jennings, and C. Kisslinger, Part B, p. 1878,
Academic Press, San Diego, 2003.