Tectonic evolution of the Salton Sea inferred from seismic reflection data
Nature Geoscience
By: D.S. Brothers, N. W. Driscoll, G.M. Kent, A.J. Harding, J.M. Babcock, and R. L. Baskin
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Abstract
Oblique extension across strike-slip faults causes subsidence and leads to the formation of pull-apart basins such as the Salton Sea in southern California. The formation of these basins has generally been studied using laboratory experiments or numerical models. Here we combine seismic reflection data and geological observations from the Salton Sea to understand the evolution of this nascent pull-apart basin. Our data reveal the presence of a northeast-trending hinge zone that separates the sea into northern and southern sub-basins. Differential subsidence (10 mm yr 1) in the southern sub-basin suggests the existence of northwest-dipping basin-bounding faults near the southern shoreline, which may control the spatial distribution of young volcanism. Rotated and truncated strata north of the hinge zone suggest that the onset of extension associated with this pull-apart basin began after 0.5 million years ago. We suggest that slip is partitioned spatially and temporally into vertical and horizontal domains in the Salton Sea. In contrast to previous models based on historical seismicity patterns, the rapid subsidence and fault architecture that we document in the southern part of the sea are consistent with experimental models for pull-apart basins. ?? 2009 Macmillan Publishers Limited.
Suggested Citation
Brothers, D., Driscoll, N.W., Kent, G., Harding, A., Babcock, J., Baskin, R.L., 2009, Tectonic evolution of the Salton Sea inferred from seismic reflection data: Nature Geoscience, v. 2, no. 8, p. 581-584, https://doi.org/10.1038/ngeo590.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Tectonic evolution of the Salton Sea inferred from seismic reflection data |
| Series title | Nature Geoscience |
| DOI | 10.1038/ngeo590 |
| Volume | 2 |
| Issue | 8 |
| Publication Date | July 26, 2009 |
| Year Published | 2009 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Nature Geoscience |
| First page | 581 |
| Last page | 584 |