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Brief Report for Elsinore fault zone, Chino section (Class A) No. 126b

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citation for this record: Treiman, J.A., and Treiman, J.Jerome, compilers, 1998, Fault number 126b, Elsinore fault zone, Chino section, in Quaternary fault and fold database of the United States: U.S. Geological Survey website, http://earthquakes.usgs.gov/hazards/qfaults, accessed 04/18/2014 06:03 PM.

Synopsis General: A major dextral strike-slip fault zone that is part of the San Andreas fault system. The sections defined here of the Elsinore fault zone, from north to south: Whittier section [126a], Chino section [126b], Glen Ivy section [126c], Temecula section [126d], Julian section [126e], Coyote Mountain section [126f], and Laguna Salada section [126g]. Research studies have been done to assess faulting on most of the sections, and have documented Holocene activity for the length of the fault zone with a slip rate around 4-5 mm/yr. Multiple events have only been dated on the Whittier fault and Glen Ivy North fault strand, so interaction between faults and adjacent sections is not well-known. Multiple strands within several sections mean that the studies are not always fully representative of the whole section. Numerous consulting reports (not summarized herein) that have addressed location and recency of faulting are on file with the State of California, California Geological Survey, as part of the records of their Alquist-Priolo Earthquake Fault Zoning Program.

Sections: This fault has 7 sections. Sections are selected following the segmentation from Working Group on California Earthquake Probabilities (1995 #4945) with addition of Laguna Salada section as used by Petersen and others (1996 #4860) and Chino fault (paired with the Whittier fault by Rockwell and others, 1992 #6431).Anderson and others (1989 #6372) also identified same segments, with addition of Chupamiertos and Sierra Mayor segments in Baja California (not included in this summary); Wesnousky (1986 #5305) defined four segments, combining the Whittier, Chino and Glen Ivy into his segment A, Temecula into segment B, Julian into segment C, and the Coyote Mountain and Laguna Salada sections into segment D.
County(s) and State(s) RIVERSIDE COUNTY, CALIFORNIA
SAN BERNARDINO COUNTY, CALIFORNIA
Physiographic province(s) PACIFIC BORDER
Length (km) This section is 20 km of a total fault length of 306 km.
Average strike N42°W (for section) versus N51°W (for whole fault)
Sense of movement Reverse
Dip Direction W
Historic earthquake
Most recent prehistoric deformation Latest Quaternary (<15 ka)
Slip-rate category Between 1.0 and 5.0 mm/yr
Date and Compiler(s) 1998
Jerome Treiman, California Geological Survey
Jerome A. Treiman, California Geological Survey