Analytical Prediction of Seismicity Rate Due to Tides and Other Oscillating Stresses

Elías R. Heimisson*, Jean Philippe Avouac

*Fyrsti höfundur fyrir þetta verk

Rannsóknarafurð: Framlag til fræðitímaritsGreinritrýni

Útdráttur

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, nonharmonic, and quasiperiodic stressing. However, it is not valid for periods similar to the characteristic time ta. 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 that Aσ0 may be underestimated if stresses are approximated by a single harmonic function. We revisit Manga et al. (2019, https://doi.org/10.1029/2019GL082892), which analyzed the tidal triggering of marsquakes and provide a rescaling of their seismicity rate response that offers a self-consistent comparison of different hydraulic conditions.

Upprunalegt tungumálEnska
Númer greinare2020GL090827
FræðitímaritGeophysical Research Letters
Bindi47
Númer tölublaðs23
DOI
ÚtgáfustaðaÚtgefið - 16 des. 2020

Athugasemd

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© 2020. American Geophysical Union. All Rights Reserved.

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