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M3.3 central valley beneath anticline |
There was a M3.3 on the west side of the Central Valley, on the same trend as the M6.6(?) 1983 Coalinga quake on a blind thrust fault. The link is to the location maps: the bottom map and aerial photo show an anticline (convex-upward fold if right-side up). The focal mechanism is oblique thrust. There is quite a lot of oil in some of these anticlines along this trend. I'll be traveling tomorrow and staying on a ship at Scripps until we leave for a paleo-climate related cruise early on Nov 9, until the 20th. If there is satellite internet like 2005 and if I have any time I'll try and report a little on what we are up to, from the ship. If no internet, or no time, or both, you'll hear from me later. Our surveying and coring will be of the sediments involved in folding above various active faults: mainly the Oak Ridge fault in the middle of the Channel (south dipping), and the north dipping North Channel-Pitas Point fault system (which intersects the Red Mountain fault at depth: the Red Mountain fault may be the main deep fault). The Red Mountain fault extends from onshore (east) to offshore (west) just east of Carpinteria. Its shallow part is then rather close to the coast of Santa Barbara and also the UCSB campus, and it dips beneath the coast (north), so earthquakes on it would be right beneath the populated coastal belt, including UCSB campus. Follow Ups: ● Re: M3.3 central valley beneath anticline - PennyB 12:03:58 - 11/5/2008 (74442) (1) ● want to trade? - heartland chris 17:46:41 - 11/5/2008 (74443) (1) ● Re: want to trade? - PennyB 18:05:45 - 11/5/2008 (74444) (0) |
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