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GEOLOGIC EVIDENCE FOR LATE QUATERNARY MOVEMENT ON THE CLAN ALPINE FAULT, WEST-CENTRAL NEVADA—TRENCH LOGS, SCARP PROFILES, LOCATION MAPS, AND SAMPLE AND SOIL DESCRIPTIONS

By Michael N. Machette1, Kathleen M. Haller1, Cal A. Ruleman2, Shannon A. Mahan1, and Koji Okumura3

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As part of regional studies of paleoseismology in the northern Great Basin, we are studying selected major extensional Quaternary faults in a traverse from Reno, Nev., to Salt Lake City, Utah, between latitudes 39° and 41° N. In 2001, we trenched the southern part of the Clan Alpine fault (CAF) about 2 km northwest of the Alpine Ranch (see fig. 1). The fault separates the Edwards Creek Valley (on the east) from the impressive front of the uplifted Clan Alpine Mountains (on the west); faceted spurs along the front suggest substantial Quaternary movement along the CAF (dePolo, 1998). Based on the tectonic geomorphology of the mountain front, dePolo (1998) estimated a long-term slip rate of 0.15 mm/yr for the CAF. Conversely, conspicuous fault scarps exist along only part of the range front, suggesting that little movement has occurred on the CAF in late Quaternary time.

The purpose of this map product is to present stratigraphic, geomorphic, and structural evidence for interpreting the late Quaternary movement history of the CAF. The interpretive data will be presented elsewhere, pending results of further dating studies. Nevertheless, the stratigraphic relations shown on this map demonstrate two latest Quaternary surface-faulting earthquakes in the past 30 k.y., and suggest that latest Quaternary slip rates near the southern end of the fault zone are slower than previously suggested for the whole fault zone.

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1U.S. Geological Survey, Denver, Colorado;
2University of Montana, Bozeman, Montana;
3University of Hiroshima, Hiroshima, Japan

Version 1.0

Posted August 2005

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