Morphologic dating of fault scarps using airborne laser swath mapping (ALSM) data
Geophysical Research Letters
By: G.E. Hilley, S. Delong, C. Prentice, K. Blisniuk, and J.R. Arrowsmith Jr.
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Abstract
Models of fault scarp morphology have been previously used to infer the relative age of different fault scarps in a fault zone using labor-intensive ground surveying. We present a method for automatically extracting scarp morphologic ages within high-resolution digital topography. Scarp degradation is modeled as a diffusive mass transport process in the across-scarp direction. The second derivative of the modeled degraded fault scarp was normalized to yield the best-fitting (in a least-squared sense) scarp height at each point, and the signal-to-noise ratio identified those areas containing scarp-like topography. We applied this method to three areas along the San Andreas Fault and found correspondence between the mapped geometry of the fault and that extracted by our analysis. This suggests that the spatial distribution of scarp ages may be revealed by such an analysis, allowing the recent temporal development of a fault zone to be imaged along its length.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Morphologic dating of fault scarps using airborne laser swath mapping (ALSM) data |
| Series title | Geophysical Research Letters |
| DOI | 10.1029/2009GL042044 |
| Volume | 37 |
| Issue | 4 |
| Year Published | 2010 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Geophysical Research Letters |
| Google Analytic Metrics | Metrics page |