Grizzly Valley fault system, Sierra Valley, CA

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The Grizzly Valley fault system (GVFS) strikes northwestward across Sierra Valley, California and is part of a network of active, dextral strike-slip faults in the northern Walker Lane (Figure 1). To investigate Quaternary motion across the GVFS, we analyzed high-resolution (0.25 m) airborne LiDAR data (Figure 2) in combination with six, high-resolution, P-wave, seismic-reflection profiles [Gold and others, 2012]. The 0.5- to 2.0-km-long seismic-reflection profiles were sited orthogonal to suspected tectonic lineaments identified from previous mapping and our analysis of airborne LiDAR data. To image the upper 400–700 m of subsurface stratigraphy of Sierra Valley (Figure 3), we used a 230-kg accelerated weight drop source. Geophone spacing ranged from 2 to 5 m and shots were co-located with the geophones. The profiles reveal a highly reflective, deformed basal marker that we interpret to be the top of Tertiary volcanic rocks, overlain by a 120- to 300-m-thick suite of subhorizontal reflectors we interpret as Plio-Pleistocene lacustrine deposits. Three profiles image the principle active trace of the GVFS, which is a steeply dipping fault zone that offsets the volcanic rocks and the basin fill (Figures 4 & 5).

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Additional publication details

Publication type Report
Publication Subtype Organization Series
Title Grizzly Valley fault system, Sierra Valley, CA
Year Published 2012
Language English
Publisher Friends of the Pleistocene
Contributing office(s) Geologic Hazards Science Center
Description 12 p.
Larger Work Type Report
Larger Work Subtype Organization Series
Larger Work Title Guidebook: neotectonics of the Lake Tahoe and Carson and Sierra Valleys, F.O.P. 2012
First page 214
Last page 225
Country United States
State California
City Sierra Valley
Other Geospatial Grizzly Valley Fault
Online Only (Y/N) N
Additional Online Files (Y/N) N