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Earthquakes in the San Francisco Bay Area Sheryl Braile, Happy Hollow School West Lafayette, IN Larry Braile, Purdue University

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Presentation on theme: "Earthquakes in the San Francisco Bay Area Sheryl Braile, Happy Hollow School West Lafayette, IN Larry Braile, Purdue University"— Presentation transcript:

1 Earthquakes in the San Francisco Bay Area Sheryl Braile, Happy Hollow School West Lafayette, IN Larry Braile, Purdue University braile@purdue.edu, www.eas.purdue.edu/~braile CSTA Convention, Oct. 2006, San Francisco, CA http://web.ics.purdue.edu/~braile/edumod/bayarea/BayAreaEQs.ppt http://web.ics.purdue.edu/~braile/edumod/bayarea/bayareaNew.htm

2 2004 USGS Map: Earthquakes and Faults in the San Francisco Bay Area

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8 http://wrgis.wr.usgs.gov/docs/gump/zulanger/bayarea/landsat.html

9 Old version (1990 map/satellite image): http://web.ics.purdue.edu/~braile/edumod/bayarea/bayarea.htm New version (2004 map): http://web.ics.purdue.edu/~braile/edumod/bayarea/bayareaNew.htm

10 The 1906 San Francisco Earthquake (M~7.8) Photo by G.K. Gilbert

11 The 1906 San Francisco Earthquake (M~7.8) ~3 m right lateral offset on the San Andreas fault

12 The 1906 San Francisco Earthquake (M~7.8) San Andreas fault at Earthquake park near Tomales Bay (road to Point Reyes) http://www.seed.slb.com/en/scictr/watch/seismology/pt_reyes.htm 1906Today

13 The 1906 San Francisco Earthquake (M~7.8) San Andreas fault at Earthquake park near Tomales Bay (road to Point Reyes) http://www.seed.slb.com/en/scictr/watch/seismology/pt_reyes.htm Offset Fence Damaged Barn (subsequently razed)

14 The 1906 San Francisco Earthquake (M~7.8) San Francisco after the Earthquake and fire.

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16 The 1906 San Francisco Earthquake (M~7.8) De-railed train.

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18 The 1906 San Francisco Earthquake (M~7.8) Comparison of fault lengths for selected significant events on the San Andreas.

19 San Andreas Fault

20 San Andreas Fault – A Right-Lateral Strike-Slip Fault What is the relative motion? Why is it called right-lateral?

21 The 1906 San Francisco Earthquake (M~7.8) MM Intensity Map

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25 The 1906 San Francisco Earthquake (M~7.8) San Francisco bay area geology.

26 The 1906 San Francisco Earthquake (M~7.8) Near- surface sediments shear wave velocity – an indicator of site response for earthquake shaking.

27 The 1989 Loma Prieta Earthquake (M7.0) Earthquake damage.

28 San Francisco bay area geology.

29 http://www.abag.ca.gov/cgi-bin/pickmapx.pl Site response map

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31 Earthquakes in California Nevada area 1973 – 2006 M3+ The Seismic Eruption software http://www.geol.binghamton.edu/faculty/jones/

32 Earthquakes in California Nevada area 1973 – 2006 M3+

33 Earthquakes in California Nevada area 1973 – 2006 M3+ Close-up of Northern CA area Northern San Andreas Fault (area that slipped in 1906)

34 Earthquakes in San Francisco Bay area 1973 – 2006 M1+ Plotted with Seismic Eruption

35 Earthquakes in San Francisco Bay area 1973 – 2006 M1+ Plotted with Seismic Eruption (bayarea.hy4 file, 3434 events)

36 Earthquakes in San Francisco Bay area from significant U.S. earthquakes catalog 1805 - 1989 Plotted with Seismic Eruption

37 Digital satellite images of the San Francisco Bay area and major faults http://www.sfbayquakes.org/

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42 http://pubs.usgs.gov/gip/2006/21/gip-21.pdf Earthquake resources

43 Soft first story failure Earthquake hazards and damage

44 Building shifted off foundation

45 Falling objects

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47 2002 Nisqually EQ

48 Olive View Hospital, 1971 San Fernando Earthquake

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50 Dec. 26, 2003 M6.6 Earthquake, Bam, Iran, ~80% of buildings destroyed

51 http://pubs.usgs.gov/gip/2005/15/ Putting Down Roots in Earthquake Country Your Handbook for the San Francisco Bay Region Earthquake hazards resources

52 M5.5+ earthquakes and probability estimate

53 M6+ earthquakes before and after the 1906 event.

54 Earthquakes in the San Francisco Bay Area Sheryl Braile, Happy Hollow School West Lafayette, IN Larry Braile, Purdue University braile@purdue.edu, www.eas.purdue.edu/~braile CSTA Convention, Oct. 2006, San Francisco, CA http://web.ics.purdue.edu/~braile/edumod/bayarea/BayAreaEQs.ppt http://web.ics.purdue.edu/~braile/edumod/bayarea/bayareaNew.htm


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