San Gabriel Fault

The San Gabriel Fault is a geological fault that forms the boundary of the southern portion of the San Gabriel Mountains and running about 87 miles (140 kilometers). The fault is a right-lateral strike-slip that was last active 1,000 of years ago (Late Quaternary west of intersection with the Sierra Madre fault; Quaternary east of that intersection; Holocene only between Saugus and Castaic). It extends southeastward from Ridge Basin to the western San Gabriel Mountains.

outhern and northern segments

It was once part of the San Andreas Fault, and is believed to be the former path of the San Andreas. It is also believed that the northwestern end of the fault zone meets the current San Andreas Fault beneath the Frazier Mountain Thrust (near the juncture of the San Andreas with the Garlock and Big Pine Faults). [ [http://quake.usgs.gov/info/faultmaps/fault213.html San Gabriel fault zone ] ]

Activity in the San Gabriel Fault

The San Gabriel moves at a rate of between 1 and 5 millimeters a year, with an average slip of around 3 millimeters.

ee also

* Earthquake
* Richter scale
* Plate tectonics
* Geology
* Seismology
* Seismic retrofit
* Southern California

External links

*http://geomaps.wr.usgs.gov/socal/geology/inland_empire/ie_san_gabriel_fault.html
*http://aapgbull.geoscienceworld.org/cgi/content/abstract/46/10/1938
*http://www.data.scec.org/fault_index/gabriel.html

References