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Geosphere, GSA's dynamic online-only journal posts 9 new articles in Sept.
Date:9/19/2013

ost consider that extension in the Gulf of California region began as subduction waned and ended about 14 to 12.5 million years ago. A general consensus also exists in considering Early and Middle Miocene volcanism of the Sierra Madre Occidental and Comond Group as subduction related, whereas volcanism after approx. 12.5 million years ago is extension related. Here Luca Ferrari and colleagues present a new regional geologic study of the eastern Gulf of California margin in the states of Nayarit and Sinaloa, Mexico, backed by 43 new Ar-Ar and U-Pb mineral ages, and geochemical data that document an earlier widespread phase of extension.



Matthew W. Blakeslee and Simon A. Kattenhorn, Dept. of Geological Sciences, University of Idaho, 875 Perimeter Drive, MS 3022, Moscow, Idaho 83844-3022, USA. Posted online 13 Sept. 2013; http://dx.doi.org/10.1130/GES00910.1.

The Hat Creek fault is one of the largest active normal faults in northeastern California; however, the seismic hazard of this fault has not been determined with great confidence in the past. Using a combination of field mapping of Late Pleistocene through Holocene earthquake ruptures and theoretical analysis, the active portion of the fault is determined to have a rupture length of at least 30 km and is capable of magnitude 6.7 earthquakes approximately every 667 years (with an uncertainty of plus or minus 167 years). There have been no historical surface-rupturing earthquake events in the past 200 years, implying a moderate near-term seismic hazard. In past events, the fault ruptured through three ages of Late Pleistocene basaltic lavas, producing a surface morphology characteristic of normal faults in analogous environments. Therefore, the seismic hazard analysis method described has general applicability to normal faults that rupture through young lava flows elsewhere.


On the estimation of geological s
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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