Hi All. When I go on a search for some information about a specific thing I never know what it is that I will find. Sometimes it’s worthless and then other times I’m not so sure and then there are times I think it should be brought to the forefront.

I found what I thought was very interesting about the some of the major quakes in California. Take Care…Don in creepy town

During the past 40 years, six major thrust and reverse earthquakes have occurred in California. All of these (except possibly the Loma Prieta earthquake) ruptured faults that were either unmapped or not mapped as active. Based on data from other projects, a large, active, blind thrust system within and extending north and south of Suisun Bay, in the Sacramento River Delta has been identified. However, the geometry, the level of the tectonic activities of the structures, and the possible hazard posed by the potential ruptures are not well known. In order to help to extend the knowledge of the style and processes of the structures, especially the evaluation of shallow faults, we did this shallow seismic reflection survey (23 lines totally) near Ryer Island in Suisun Bay in late May, 1998. Recent equipment improvements and related research results on the data processing enable the routine high resolution study of active faults in the shallow marine environment. High resolution seismic survey can provide results that compare well with direct observation and trenching on land. High resolution data reveal clear expression of deformation coinciding with projections of mapped faults and with gravity data, and high resolution seismic data was used to characterize a fault connection between the Rodgers Creek and Pinole faults in eastern San Pablo Bay (Williams et al., 1995).

• Suisun Bay