Injection‐Induced Seismicity Size Distribution Dependent on Shear Stress
Name
Geophysical Research Letters - 2021 - Mukuhira - Injection‐Induced Seismicity Size Distribution Dependent on Shear Stress.pdf
Description
Published version
Size
1.74 MB
Format
Adobe PDF
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Author(s)
Mukuhira, Y
Fehler, MC
Ito, T
Asanuma, H
Häring, MO
Date Issued
March 10, 2021
Journal
Geophysical Research Letters
Publisher
American Geophysical Union
Citation
Mukuhira, Y., Fehler, M. C., Ito, T., Asanuma, H., & Häring, M. O. (2021). Injection-induced seismicity size distribution dependent on shear stress. Geophysical Research Letters, 48, e2020GL090934.
Version
Final published version
Abstract
Like natural seismicity, induced seismicity caused by injection also shows a power law size distribution, and its gradient b-value is used for seismic hazard analysis. Despite the well-known result that b-value is negatively correlated with differential stress for natural earthquakes, there is no similar correlation for b-value variations because the differential stress is nearly constant for injection-induced seismicity, we thus investigate the b-value dependence on the relative shear stress acting on existing fractures, using the fault orientation and in situ stress information. The seismicity occurring along existing fractures having high shear stress has significantly lower b-values than does that associated with lower shear stress fractures. We examine the b-value dependency on slightly changing differential stress, but the relationship is not clear. The b-value for injection-induced seismicity is dependent on relative shear stress on faults, which is a novel physical explanation for the b-value variations of induced seismicity.
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Creative Commons Attribution-NonCommercial
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DOI of Published Version
https://doi.org/10.1029/2020gl090934
