Trench logs from the Dogwood Road paleoseismic site, Imperial fault, Imperial Valley, California
Authors/Creators
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1.
Earth Observatory of Singapore
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2.
Nanyang Technological University
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3.
San Diego State University
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4.
Instituto Dom Luiz
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5.
University of Lisbon
Description
Full-resolution annotated trench logs from the Dogwood Road paleoseismic site along the Imperial fault at Mesquite Basin, Imperial Valley, southeastern California. These logs accompany Meltzner, Rockwell, Tsang, and Figueiredo, “Slip variability and temporal clustering along the Imperial fault at Mesquite Basin, Imperial Valley, California” (Bulletin of the Seismological Society of America, in review), which shows simplified versions of key logs and describes the stratigraphy, event horizons, and radiocarbon samples.
Files include rectified photomosaics of trench exposures, annotated with stratigraphic contacts, faults, event horizons, and radiocarbon sample locations. Exposure names follow the nomenclature in the paper.
Notes
File names give the trench and exposure (e.g., T4D-NW-A is exposure NW-A of trench T4D; see Table 2 of the paper), followed by the date of the log version (YYYYMMDD). Logs marked “refl” show southeast walls reflected so that southwest is on the left, as in the paper’s Figure 7. “ext” denotes a trench extension, “FZ” the fault-zone portion of an exposure, and “Fence” a fence diagram of fault-parallel exposures (T2 and T5 in the hanging wall; T6 and T7 in the footwall). The T9A log was not completed and is not included: its photographs were poorly lit, no radiocarbon samples were taken from it, and the same relationships are clearer in T9B and T9C.
Files
IFD-T1-NW-FZ-20250925.pdf
Files
(8.6 GB)
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Additional details
Funding
- Southern California Earthquake Center
- Late Holocene earthquake history of the Imperial fault: a test of earthquake recurrence models SCEC Award 07007
- United States Geological Survey
- A long record of earthquakes with timing and displacements for the Imperial Fault: a test of earthquake recurrence models NEHRP Award G10AP00003