Hillshade raster (235-degree azimuth, 20-degree sun angle) derived from lidar data collected after the August 24, 2014 South Napa earthquake

Publication Date

2019-03-08

Time Period

2014-09-09

Ponti, D.J., Rosa, C.M., and Blair, J.L., 2019, Digital datasets documenting fault rupture and ground deformation features produced by the Mw 6.0 South Napa Earthquake of August 24, 2014: U.S. Geological Survey data release, https://doi.org/10.5066/F7P26W84.

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Because most fault rupture produces small-scale micro-topography, the detailed elevation data obtained from the September 9, 2014 USGS/Towill LiDAR acquisition proved extremely valuable for identifying fault rupture that could not be observed on imagery. This was especially true where strike-slip faulting in unconsolidated material produced characteristic “mole tracks” (linear mounded zones that develop owing to off-strike shears) or where several cm or more of vertical offset was observed across the rupture. We found low sun angle hillshades of lidar data best portrayed small-scale faulting features, whereas typical high-angle hillshading techniques "wash out" such features.

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