Photomosaics and event evidence from the Frazier Mountain paleoseismic site, trench 1, cuts 5–24, San Andreas Fault Zone, southern California (2010–2012)
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Abstract
The Frazier Mountain paleoseismic site is located within the northern Big Bend of the southern San Andreas Fault (lat 34.8122° N., lon 118.9034° W.), in a small structural basin formed by the fault (fig. 1). The site has been the focus of over a decade of paleoseismic study due to high stratigraphic resolution and abundant dateable material. Trench 1 (T1) was initially excavated as a 50-m long, fault-perpendicular trench crossing the northern half of the basin (Lindvall and others, 2002; Scharer and others, 2014a). Owing to the importance of a high-resolution trench site at this location on a 200-km length of the fault with no other long paleoseismic records, later work progressively lengthened and deepened T1 in a series of excavations, or cuts, that enlarged the original excavation. Scharer and others (2014a) provide the photomosaics and event evidence for the first four cuts, which largely show the upper section of the site, represented by alluvial deposits that date from about A.D. 1500 to present. Scharer and others (2014b) discuss the earthquake evidence and dating at the site within the context of prehistoric rupture lengths and magnitudes on the southern San Andreas Fault. Here we present the photomosaics and event evidence for a series of cuts from the lower section, covering sediments that were deposited from about A.D. 500 to 1500 (fig. 2).
Suggested Citation
Scharer, K.M., Fumal, T.E., Weldon, R.J., II, Streig, A.R., 2015, Photomosaics and event evidence from the Frazier Mountain paleoseismic site, trench 1, cuts 5–24, San Andreas Fault Zone, southern California (2010–2012): U.S. Geological Survey Open-File Report 2015–1147, 25 p., 3 sheets, http://dx.doi.org/10.3133/ofr20151147.
ISSN: 2331-1258 (online)
Study Area
Table of Contents
- Introduction
- Trenching Methodology
- Site Structure and Stratigraphy
- Event Evidence
- Acknowledgments
- References
- Appendix
- Figures (5)
- Tables (2)
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Photomosaics and event evidence from the Frazier Mountain paleoseismic site, trench 1, cuts 5–24, San Andreas Fault Zone, southern California (2010–2012) |
| Series title | Open-File Report |
| Series number | 2015-1147 |
| DOI | 10.3133/ofr20151147 |
| Year Published | 2015 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Publisher location | Reston, VA |
| Contributing office(s) | Earthquake Science Center |
| Description | Pamphlet: iii, 28 p.; 6 Sheets: 36.0 x 38.9 inches or smaller |
| Time Range Start | 2010-01-01 |
| Time Range End | 2012-12-31 |
| Country | United States |
| State | California |
| Other Geospatial | Frazier Mountain, San Andreas Fault |
| Online Only (Y/N) | Y |
| Additional Online Files (Y/N) | N |
| Google Analytic Metrics | Metrics page |