TY - JOUR
T1 - Analytical Prediction of Seismicity Rate Due to Tides and Other Oscillating Stresses
AU - Heimisson, Elías R.
AU - Avouac, Jean Philippe
N1 - Publisher Copyright:
© 2020. American Geophysical Union. All Rights Reserved.
PY - 2020/12/16
Y1 - 2020/12/16
N2 - 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.
AB - 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.
KW - earthquake triggering
KW - marsquakes
KW - rate-and-state friction
KW - seasonal seismicity
KW - tides
UR - http://www.scopus.com/inward/record.url?scp=85097573594&partnerID=8YFLogxK
U2 - 10.1029/2020GL090827
DO - 10.1029/2020GL090827
M3 - Article
AN - SCOPUS:85097573594
SN - 0094-8276
VL - 47
JO - Geophysical Research Letters
JF - Geophysical Research Letters
IS - 23
M1 - e2020GL090827
ER -