Long and short term deformation along the San Andreas Fault

• Examples of issues of spatial and temporal scale of interest. Also indicates rate of deformation.

Areas of contrasting behavior along the San Andreas Fault (from Allen, 1968)

Carrizo Plain

1906 M7.8 San

Francisco Earthquake

Beginning of modern

earthquake science

1906 earthquake surface rupture.8’ fence offset above

http://mnw.eas.slu.edu/Earthquake_Center/1906EQ/1906thumb.htmlAnd http://quake.wr.usgs.gov/info/1906/images/fenceoffset_big.html

“Reid’s elastic rebound hypothesis

http://quake.wr.usgs.gov/info/1906/reid.html

http://www.matter.org.uk/matscicdrom/manual/di.html

Edge dislocation

Screw dislocation

Dislocation: simple idealization of displacement discontinuity in continuous body

Idealization of brittle crust with embedded strike slip fault (Thatcher, 1990)

Strike-slip parallel displacements from simple screw dislocation model (Thatcher, 1990)

1906 coseismic displacements

Best fit depth: 7000 m

Young, et al., 2001