San Gabriel Fault

The San Gabriel Fault is a geological fault in Los Angeles County, California, running about 87 miles (140 km) southeastward from the Ridge Basin in the Sierra Pelona-San Emigdio Mountains juncture area to the western San Gabriel Mountains that forms their southwestern face near Sunland and the northeastern San Fernando Valley, and then on the south flank to the southeastern part of the San Gabriel range.

Map of the San Gabriel Fault zone

Geology

The San Gabriel Fault is a right-lateral strike-slip that was last active thousands of years ago — Late Quaternary west of intersection with the Sierra Madre Fault, and Quaternary east of that intersection, and Holocene only further west between Saugus and Castaic-Gorman.

The San Gabriel Fault was once part of the San Andreas Fault, and is believed to be the former path of it. It is also believed that the northwestern end of this fault zone meets the current San Andreas Fault zone beneath the Frazier Mountain Thrust, near the juncture of the San Andreas with the Garlock Fault and Big Pine Fault.[1] The San Gabriel Fault moves at a rate of between 1 and 5 millimeters a year, with an average slip of around 3 millimeters.

gollark: `smartctl` says `241 Total_LBAs_Written 0x0032 099 099 000 Old_age Always - 19835005814` but I have no idea what an "LBA" is.
gollark: I've got an 850 Evo sitting around from 2016 or so still in use, how can I check how much I have writted to it?
gollark: They can go *waaaaaay* beyond that, though.
gollark: Terabytes written.
gollark: In the name of equality, we must REMOVE ALL THE WALLS OF IT.

References
  1. San Gabriel fault zone/faultmaps Archived September 23, 2006, at the Wayback Machine
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