The San Andreas Rift

Slip along the San Andreas Fault Associated with the Earthquake

_______________________________ 155 Introduction ______________________________ 155 Observations _______________________________ 155 Comparison with 1968 slippage __________________ 157 Similarities ______________________________ 157 Differences ________________________________ 157 Discussion ________________________________ 157 Acknowledgments -_________________________^_ 159 References cited ...

Nonvolcanic tremors deep beneath the San Andreas Fault.

We have discovered nonvolcanic tremor activity (i.e., long-duration seismic signals with no clear P or S waves) within a transform plate boundary zone along the San Andreas Fault near Cholame, California, the inferred epicentral region of the 1857 Fort Tejon earthquake (moment magnitude approximately 7.8). The tremors occur between 20 to 40 kilometers' depth, below the seismogenic zone (the upp...

Localized and distributed creep along the southern San Andreas Fault

We investigate the spatial pattern of surface creep and off-fault deformation along the southern segment of the San Andreas Fault using a combination of multiple interferometric synthetic aperture radar viewing geometries and survey-mode GPS occupations of a dense array crossing the fault. Radar observations from Envisat during the period 2003–2010 were used to separate the pattern of horizonta...

Geophysics. Past and future earthquakes on the San Andreas Fault.

Coulomb stress accumulation along the San Andreas Fault system

Stress accumulation rates along the primary segments of the San Andreas Fault system are computed using a three-dimensional (3-D) elastic half-space model with realistic fault geometry. The model is developed in the Fourier domain by solving for the response of an elastic halfspace due to a point vector body force and analytically integrating the force from a locking depth to infinite depth. Th...