Tidal triggering of earthquakes suggests poroelastic behavior on the San Andreas Fault
Abstract
Tidal triggering of earthquakes is hypothesized to provide quantitative information regarding the fault's stress state, poroelastic properties, and may be significant for our understanding of seismic hazard. To date, studies of regional or global earthquake catalogs have had only modest successes in identifying tidal triggering. We posit that the smallest events that may provide additional evidence of triggering go unidentified and thus we developed a technique to improve the identification of very small magnitude events. We identify events applying a method known as inter-station seismic coherence where we prioritize detection and discrimination over characterization. Here we show tidal triggering of earthquakes on the San Andreas Fault. We find the complex interaction of semi-diurnal and fortnightly tidal periods exposes both stress threshold and critical state behavior. Lastly, our findings reveal earthquake nucleation processes and pore pressure conditions – properties of faults that are difficult to measure, yet extremely important for characterizing earthquake physics and seismic hazards.
- Authors:
-
[1];
[1]
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- U.S. Geological Survey, Pasadena, CA (United States)
- Publication Date:
- Research Org.:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1341854
- Alternate Identifier(s):
- OSTI ID: 1413358
- Report Number(s):
- LA-UR-15-26081
Journal ID: ISSN 0012-821X; TRN: US1701079
- Grant/Contract Number:
- AC52-06NA25396
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Earth and Planetary Science Letters
- Additional Journal Information:
- Journal Volume: 460; Journal Issue: C; Journal ID: ISSN 0012-821X
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 58 GEOSCIENCES; Planetary Sciences
Citation Formats
Delorey, Andrew A., van der Elst, Nicholas J., and Johnson, Paul Allan. Tidal triggering of earthquakes suggests poroelastic behavior on the San Andreas Fault. United States: N. p., 2016.
Web. doi:10.1016/j.epsl.2016.12.014.
Delorey, Andrew A., van der Elst, Nicholas J., & Johnson, Paul Allan. Tidal triggering of earthquakes suggests poroelastic behavior on the San Andreas Fault. United States. https://doi.org/10.1016/j.epsl.2016.12.014
Delorey, Andrew A., van der Elst, Nicholas J., and Johnson, Paul Allan. Wed .
"Tidal triggering of earthquakes suggests poroelastic behavior on the San Andreas Fault". United States. https://doi.org/10.1016/j.epsl.2016.12.014. https://www.osti.gov/servlets/purl/1341854.
@article{osti_1341854,
title = {Tidal triggering of earthquakes suggests poroelastic behavior on the San Andreas Fault},
author = {Delorey, Andrew A. and van der Elst, Nicholas J. and Johnson, Paul Allan},
abstractNote = {Tidal triggering of earthquakes is hypothesized to provide quantitative information regarding the fault's stress state, poroelastic properties, and may be significant for our understanding of seismic hazard. To date, studies of regional or global earthquake catalogs have had only modest successes in identifying tidal triggering. We posit that the smallest events that may provide additional evidence of triggering go unidentified and thus we developed a technique to improve the identification of very small magnitude events. We identify events applying a method known as inter-station seismic coherence where we prioritize detection and discrimination over characterization. Here we show tidal triggering of earthquakes on the San Andreas Fault. We find the complex interaction of semi-diurnal and fortnightly tidal periods exposes both stress threshold and critical state behavior. Lastly, our findings reveal earthquake nucleation processes and pore pressure conditions – properties of faults that are difficult to measure, yet extremely important for characterizing earthquake physics and seismic hazards.},
doi = {10.1016/j.epsl.2016.12.014},
journal = {Earth and Planetary Science Letters},
number = C,
volume = 460,
place = {United States},
year = {Wed Dec 28 00:00:00 EST 2016},
month = {Wed Dec 28 00:00:00 EST 2016}
}
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Works referencing / citing this record:
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