Hi All. I did some follow-ups on the blind thrust fault in the Sacramento River Delta/Suisun Bay area.

What I learned from some phone calls and a more precise search of the web yielded some interesting information.

I have a feeling that the 1892 Vacaville/Winters quakes are going to be looked at again. There is a chance this recent found fault system may have been the source of the two quakes and not the Great Valley vault. Take Care…Don in creepy town

“In addition, proprietary industry data and results from the recent BASIX experiment indicate that one or more generally east-west-trending anticlines are present within the western Delta region between the Potrero Hills and Los Medanos anticlines. At present, these structures are not well understood, primarily because they are almost entirely beneath the water surface. Shallow high resolution seismic reflection data recently obtained for the BASIX experiment show that Ryer Island, a small island between Grizzly Bay and Suisun Bay, is the surface expression of a west-northwest-trending anticline. Re-evaluation of the bathymetry in the western Delta region indicates that the fold probably is expressed in the topography around Ryer Island. The shallow high resolution seismic reflection data clearly show that late Quaternary submarine strata deposited along the flanks of Ryer Island are deformed by uplift and tilting.”

“This structural pattern also is present south of the Delta region in the area around Mt. Diablo and Livermore Valley, which suggests that the Delta is part of a larger tectonic domain that likely extends from the northern Diablo Range on the south to the area around Fairfield and Vacaville to the north.”

• Suisun Bay