Archived report (descriptions no longer maintained)
Healdsburg fault (Class A) No. 31
Last Review Date: 1998-09-10
Compiled in cooperation with the California Geological Survey
| County(s) and State(s) |
SONOMA COUNTY, CALIFORNIA |
| Physiographic province(s) |
PACIFIC BORDER |
| Reliability of location |
Good Compiled at 1:24,000 and 1:250,000 scale. |
| Length (km) | 31 km. |
| Average strike | N41°W |
| Sense of movement | Right lateral |
| Dip Direction | V |
| Historic earthquake | |
| Most recent prehistoric deformation | late Quaternary (<130 ka) |
| Slip-rate category | Between 0.2 and 1.0 mm/yr |
| References |
Blake, M.C., Jr., Smith, J.T., Wentworth, C.M., and Wright, R.H., 1971, Preliminary geologic map of western Sonoma County and northernmost Marin County, California: U.S. Geological Survey Basic Data Contribution 12, 1 pl., scale 1:62,500. Brown, R.D., Jr., 1970, Faults that are historically active or that show evidence of geologically young surface displacement, San Francisco Bay region, a progress report—Oct. 1970: U.S. Geological Survey Open-File Map (U.S. Department of the Interior and U.S. Department of Housing and Urban Development Basic Data Contribution 7), 2 sheets, scale 1:250,000. Bryant, W.A., 1982, Chianti, Healdsburg, Alexander, Maacama and related faults, Sonoma County: California Division of Mines and Geology Fault Evaluation Report 135 microfiche copy in California Division of Mines and Geology Open-File Report 90-10, 18 p., scale 1:24,000, parts of 5 quadrangles, scale 1:24,000. Fox, K.F., Jr., 1983, Tectonic setting of late Miocene, Pliocene, and Pleistocene rocks in part of the Coast Ranges north of San Francisco, California: U.S. Geological Survey Professional Paper 1239, 33 p., 1 pl. Fox, K.F., Sims, J.D., Bartow, J.A., and Helley, E.J., 1973, Preliminary geologic map of eastern Sonoma County and western Napa County, California: San Francisco Bay Region Environment and Resources Planning Study: U.S. Geological Survey Miscellaneous Field Studies Map MF-483 (Basic Data Contribution 56), scale 1:62,500. Gealey, W.K., 1951, Geology of the Healdsburg quadrangle, California: California Department of Conservation, Division of Mines and Geology Bulletin 161, 50 p., 3 pls., scale 1:62,500. Goter, S.K., Oppenheimer, D.H., Mori, J.J., Savage, M.K., and Masse, R.P., 1994, Earthquakes in California and Nevada: U.S. Geological Survey Open-File Report 94-647, 1 sheet, scale 1:1,000,000. Harlan Tait Associates, 1996, Fault and geotechnical investigation, planned Panorama Reservoir, Healdsburg, California: Technical report to , 22 p. (copy of report on file at CDMG-SF as C-918). Hart, E.W., Bryant, W.A., and Smith, T.C., 1983, Summary report—Fault evaluation program, 1981-1982 area, northern Coast Ranges region, California: California Department of Conservation, Division of Mines and Geology Open-File Report 83-10, 17 p., 1 pl. Herd, D.G., Helley, E.J., and Rogers, B.W., 1977, Map of Quaternary faulting along the southern Maacama fault zone, California: U.S. Geological Survey Open-File Report 77-453, 7, scale 1:24,000. Huffman, M.E., and Armstrong, C.F., 1980, Geology for planning in Sonoma County: California Division of Mines and Geology Special Report 120, 31 p., 5 pls., scale 1:62,500. Jennings, C.W., 1994, Fault activity map of California and adjacent areas, with locations of recent volcanic eruptions: California Division of Mines and Geology Geologic Data Map 6, 92 p., 2 pls., scale 1:750,000. Kleinfelder, I., 1996, Geologic investigation and fault hazard evaluation report, Foss Creek Detention Basin, Healdsburg, California: Unpublished consultant's report, Project No. 41-3100-01, 20 p. (copy of report on file at CDMG-SF as C-919). Petersen, M.D., Bryant, W.A., Cramer, C.H., Cao, T., Reichle, M.S., Frankel, A.D., Lienkaemper, J.J., McCrory, P.A., and Schwartz, D.P., 1996, Probabilistic seismic hazard assessment for the State of California: California Department of Conservation, Division of Mines and Geology Open-File Report 96-08 (also U.S. Geological Open-File Report 96-706), 33 p. Willis, B., and Wood, H.D., 1922, Fault map of the state of California: Seismological Society of America, scale 1:506,880. Wong, I.G., 1991, Contemporary seismicity, active faulting, and seismic hazards of the Coast Ranges between San Francisco Bay and Healdsburg, California: Journal of Geophysical Research, v. 96, no. B12, p. 19,891-19,904. |