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Clarke's Restaurant on Main Street, Winters; rear view. April 1892 Source: Vacaville-Winters Earthquakes...1892, by John H. Bennett, Division of Mines and Geology, Published in California Geology, April 1987Map
At 2:50 AM on April 19, 1892 there was a Magnitude 6.4 quake at Vacaville and just two days later at 9:43 AM there was a Magnitude 6.4 quake at Winters just 11 miles to the north.
In "Vacaville-Winters Earthquakes . . .1892 Solano And Yolo Counties" - California Geology, April 1987, Vol. 40, No. 4. John Bennett concludes:
Within this area possible sources of the 1892 earthquake sequence include:
a) an unrecognized thrust fault or faults related to the development of folds along the western margin of the Great Valley, a source similar to that which produced the 1983 Coalinga earthquake,
(b) a concealed fault within the Vaca Valley-Pleasants Valley trough, possibly the northern extension of the Vaca Fault,
(c) a bedding plane fault within the steeply dipping Great Valley sequence.
The significance of the Vacaville-Winters earthquakes has become more apparent since the 1983 Coalinga earthquake focused attention on the seismic hazard associated with the western margin of the Great Valley. It is highly probable that both of these destructive earthquakes were the result of the same tectonic processes taking place in similar environments. Logic dictates prudent planning for seismic hazards mitigation all along this major boundary and most certainly in the rapidly urbanizing counties east of San Francisco Bay.
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