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Re: 100 Year Anniversary SF Quake!
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Posted by Canie on April 20, 2006 at 09:10:13:
Hey Chris - good work! I found an abstract speaking of the new fault: New Coastal Strike-Slip Faults with Relatively High Rates of Slip and Deformation between the Offshore San Andreas and Onshore Maacama Faults, Northern Coastal California, Mendocino County (oral presentation Wed. 11:15 a.m.) Our analysis of 10-m digital elevation models combined with GPS ground surveying of marine terraces, mapping from large-scale air photos, and field work reveals at least three previously unmapped strike-slip faults with 1) lengths of at least 5–10 km each, 2) relatively high slip rates (4–6 mm/yr estimated on one fault), 3) significant amounts of cumulative right-lateral strike-slip fault offset, and 4) shear zones ranging from 1–5 m in width. One of the faults, here named the Pacific Star fault, strikes parallel to the SAF; the other two strike ~N10-20W and bound an ~3-km long coastal zone of transtensional subsidence in which the 125-ka marine terrace is warped downward to the west and buried beneath a repeated sequence of peats and beach sands with radiocarbon dates spanning the late Pleistocene to Holocene. And there's a press release on the fault linked below Thanks for the info! Canie
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