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

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Presentation transcript:

Earthquakes in the San Francisco Bay Area Sheryl Braile, Happy Hollow School West Lafayette, IN Larry Braile, Purdue University CSTA Convention, Oct. 2006, San Francisco, CA

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

Old version (1990 map/satellite image): New version (2004 map):

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

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

The 1906 San Francisco Earthquake (M~7.8) San Andreas fault at Earthquake park near Tomales Bay (road to Point Reyes) Today

The 1906 San Francisco Earthquake (M~7.8) San Andreas fault at Earthquake park near Tomales Bay (road to Point Reyes) Offset Fence Damaged Barn (subsequently razed)

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

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

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

San Andreas Fault

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

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

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

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

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

San Francisco bay area geology.

Site response map

Earthquakes in California Nevada area 1973 – 2006 M3+ The Seismic Eruption software

Earthquakes in California Nevada area 1973 – 2006 M3+

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

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

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

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

Digital satellite images of the San Francisco Bay area and major faults

Earthquake resources

Soft first story failure Earthquake hazards and damage

Building shifted off foundation

Falling objects

2002 Nisqually EQ

Olive View Hospital, 1971 San Fernando Earthquake

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

Putting Down Roots in Earthquake Country Your Handbook for the San Francisco Bay Region Earthquake hazards resources

M5.5+ earthquakes and probability estimate

M6+ earthquakes before and after the 1906 event.

Earthquakes in the San Francisco Bay Area Sheryl Braile, Happy Hollow School West Lafayette, IN Larry Braile, Purdue University CSTA Convention, Oct. 2006, San Francisco, CA