Healdsburg Fault on:
[Wikipedia]
[Google]
[Amazon]
The Healdsburg Fault is a seismically active geological feature associated with the
The Healdsburg Fault is a seismically active geological feature associated with the Santa Rosa Plain
Santa Rosa (Spanish for " Saint Rose") is a city and the county seat of Sonoma County, in the North Bay region of the Bay Area in California. Its estimated 2019 population was 178,127. It is the largest city in California's Wine Country and R ...
and the Alexander Valley
The Alexander Valley (Wappo: Unutsawaholmanoma, "Toyon Bush Berry Place") is a Californian American Viticultural Area (AVA) just north of Healdsburg in Sonoma County. It is home to many wineries and vineyards, as well as the city of Cloverdale. ...
, in Sonoma County, California
Sonoma County () is a county (United States), county located in the U.S. state of California. As of the 2020 United States Census, its population was 488,863. Its county seat and largest city is Santa Rosa, California, Santa Rosa. It is to the n ...
, United States. The eastern sides of these floodplains are bounded by strike-slip
In geology, a fault is a planar fracture or discontinuity in a volume of rock across which there has been significant displacement as a result of rock-mass movements. Large faults within Earth's crust result from the action of plate tectonic ...
or transform faults. The maximum credible earthquake expected to be generated from the Healdsburg Fault is estimated to be about 7.5 on the Richter magnitude scale.C.Michael Hogan, John Torrey, Brian McElroy et al., ''Environmental Impact Report, Southeast Santa Rosa Annexation 2-88'', Earth Metrics Inc., Report 7941, California State Clearinghouse, Sacramento, Ca., March 1990
The last major event in Sonoma County were the 1969 Santa Rosa earthquakes, a magnitude 5.6 and 5.7 doublet
Doublet is a word derived from the Latin ''duplus'', "twofold, twice as much",