Grizzly Valley fault system, Sierra Valley, CA
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Abstract
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).
Study Area
| 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 |
| Google Analytic Metrics | Metrics page |