The life span of fault-crossing channels.

Autor: Dascher-Cousineau K; Department of Earth and Planetary Sciences, University of California, Santa Cruz, CA, USA. kdascher@ucsc.edu., Finnegan NJ; Department of Earth and Planetary Sciences, University of California, Santa Cruz, CA, USA., Brodsky EE; Department of Earth and Planetary Sciences, University of California, Santa Cruz, CA, USA.
Jazyk: angličtina
Zdroj: Science (New York, N.Y.) [Science] 2021 Jul 09; Vol. 373 (6551), pp. 204-207.
DOI: 10.1126/science.abf2320
Abstrakt: Successive earthquakes can drive landscape evolution. However, the mechanism and pace with which landscapes respond remain poorly understood. Offset channels in the Carrizo Plain, California, capture the fluvial response to lateral slip on the San Andreas Fault on millennial time scales. We developed and tested a model that quantifies competition between fault slip, which elongates channels, and aggradation, which causes channel infilling and, ultimately, abandonment. Validation of this model supports a transport-limited fluvial response and implies that measurements derived from present-day channel geometry are sufficient to quantify the rate of bedload transport relative to slip rate. Extension of the model identifies the threshold for which persistent change in transport capacity, obliquity in slip, or advected topography results in reorganization of the drainage network.
(Copyright © 2021 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works.)
Databáze: MEDLINE
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