Seismic Reflection Imaging of the Low-Angle Panamint Normal Fault System, Eastern California

Ryan D. Gold, William J. Stephenson, Richard W. Briggs, Christopher B. DuRoss, Eric Kirby, Edward Woolery, Jaime Delano, Jack K. Odum

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Shallowly dipping (<30°) low-angle normal faults (LANFs) have been documented globally; however, examples of active LANFs in continental settings are limited. The western margin of the Panamint Range in eastern California is defined by a LANF that dips west beneath Panamint Valley and has evidence of Quaternary motion. In addition, high-angle dextral-oblique normal faults displace middle to late Quaternary alluvial fans near the range front. To image shallow (<1 km depth), crosscutting relationships between the low- and high-angle faults along the range front, we acquired two high-resolution P wave seismic reflection profiles. The northern, 4.6-km-long profile crosses the 2-km-wide Wildrose graben and the southern, 0.8-km-long profile extends onto the Panamint Valley playa, ~7.5 km S of Ballarat, CA. The profile across the Wildrose graben reveals a robust, low-angle reflector interpreted to represent the LANF separating Plio-Pleistocene alluvial fanglomerate and Proterozoic metasedimentary deposits. High-angle faults interpreted in the seismic profile correspond to fault scarps on Quaternary alluvial fan surfaces. Interpretation of the reflection data suggests that the high-angle faults vertically displace the LANF up to 80 m within the Wildrose graben. Similarly, the profile south of Ballarat reveals a low-angle reflector, which appears both rotated and displaced up to 260 m by high-angle faults. These results suggest that near the Panamint range front, the high-angle faults are the dominant active structures. We conclude that at least at shallow (<1 km) depths, the LANF we imaged is not active today.

Original languageEnglish
Article numbere2020JB020243
JournalJournal of Geophysical Research: Solid Earth
Volume125
Issue number11
DOIs
StatePublished - Nov 2020

Bibliographical note

Publisher Copyright:
Published 2020. This article is a U.S. Government work and is in the public domain in the USA.

Keywords

  • California
  • Panamint Valley
  • Panamint Valley fault zone
  • low-angle normal fault
  • seismic reflection

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

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