Analytical prediction of seismicity rate due to tides and other oscillating stresses

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Authors

Elias Rafn Heimisson , Jean-Philippe Avouac

Abstract

Oscillatory stresses are ubiquitous on earth and other solid-surface bodies. Tides and seasonal signals perpetually stress faults in the crust. Relating seismicity to these stresses offers fundamental insight into earthquake triggering. We present a simple model that describes seismicity rate due to perpetual oscillatory stresses. The model applies to large amplitude, non-harmonic, and quasi-periodic stressing. However, it is not valid for periods larger than the characteristic time $t_a$. We show that seismicity rate from short-period stressing scales with the stress amplitude, but for long-periods with the stressing rate. Further, that background seismicity rate $r$ is equal to the average seismicity rate during short-period stressing. We suggest $A\sigma_0$ may be underestimated if stresses are approximated by a single harmonic function. We revisit Manga et al. (2019), which analyzed the tidal triggering of Marsquakes, and provide a re-scaling of their seismicity rate response that offers a self-consistent comparison of different hydraulic conditions.

DOI

https://doi.org/10.31223/osf.io/duvq2

Subjects

Earth Sciences, Geophysics and Seismology, Physical Sciences and Mathematics, Planetary Geophysics and Seismology, Planetary Sciences, Tectonics and Structure

Keywords

Tides, earthquake triggering, Marsquakes, rate-and-state friction, seasonal seismicity

Dates

Published: 2020-03-03 05:07

Last Updated: 2020-06-23 12:44

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License

CC BY Attribution 4.0 International

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