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Brief Report for Rodgers Creek fault (Class A) No. 32

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Compiled in cooperation with the California Geological Survey

citation for this record: Hart, E.W., compiler, 1998, Fault number 32, Rodgers Creek fault, in Quaternary fault and fold database of the United States: U.S. Geological Survey website,, accessed 09/22/2014 10:12 AM.

Synopsis Holocene dextral fault. Important branch of the larger San Andreas fault system connecting, by means of right steps, the Hayward fault [55] to the south and the Maacama fault [30] to the north. Detailed geologic and geomorphic mapping by Brown (1970 #1320; 1971 #5273), Fox and others (1973 #5253), Sims and others (1973 #5263), Blake and others (1971 #4797; 1974 #5272), Huffman and Armstrong (1980 #4862), Hart (1982 #5267; 1992 #5268), Bryant (1982 #5251), and Jennings (1988 #5266) identified recently active traces of the fault. Based on surface traces, the fault was zoned under the Alquist-Priolo Earthquake Fault Zoning Act from Windsor Creek on the north almost to San Pablo Bay (California Division of Mines and Geology, 1983 #5275; 1993 #5298). Two paleoseismic investigations may have identified the last three earthquakes and determined a slip rate of 6.4-10.4 mm/yr for the south part of the fault (Schwartz and others, 1992 #5264) and several site investigations under the Alquist-Priolo Act have located or verified Holocene-active fault traces (Hart, 1982 #5267; 1992 #5268). High-precision theodolite surveys conducted since 1980 have not indicated any fault creep (Galehouse, 1995 #5500).

County(s) and State(s) SONOMA COUNTY, CALIFORNIA
Physiographic province(s) PACIFIC BORDER
Length (km) 56 km.
Average strike N34°W
Sense of movement Dextral
Dip Direction V
Historic earthquake
Most recent prehistoric deformation Latest Quaternary (<15 ka)
Slip-rate category Greater than 5.0 mm/yr
Date and Compiler(s) 1998
Earl W. Hart, California Geological Survey