Statistical Studies of Induced and Triggered Seismicity at The Geysers, California

Hawkins, Angela; Turcotte, Donald L.; Yıkılmaz, M. B.; Rundle, John B.

doi:10.1007/s00024-017-1569-z

Cited by 3 publications

(1 citation statement)

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“…Since b value is dependent upon magnitudes sampled, we adjust event magnitudes in the EGS catalog to be comparable to the ANSS/ComCat reported magnitudes by M ANSS = M EGS -0.66 before our b value analysis (for more details see supplementary material). This magnitude adjustment is similar to Hawkins et al [2017]. We use the combined, magnitude-adjusted catalogs for the b value calculation because our matched filter detections were made up to 12 hours prior to the mainshocks, and in most cases, there were not enough detections for an adequate frequency-magnitude distribution.…”

Section: Localized Stress Changesmentioning

confidence: 99%

Testing for the ‘predictability’ of dynamically triggered earthquakes in The Geysers geothermal field

Aiken

Meng

Hardebeck

2018

Earth and Planetary Science Letters

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The Geysers geothermal field is well known for being susceptible to dynamic triggering of earthquakes by large distant earthquakes, owing to the introduction of fluids for energy production. Yet, it is unknown if dynamic triggering of earthquakes is 'predictable' or whether dynamic triggering could lead to a potential hazard for energy production. In this paper, our goal is to investigate the characteristics of triggering and the physical conditions that promote triggering to determine whether or not triggering is in anyway foreseeable. We find that, at present, triggering in The Geysers is not easily 'predictable' in terms of when and where based on observable physical conditions. However, triggered earthquake magnitude positively correlates with peak imparted dynamic stress, and larger dynamic stresses tend to trigger sequences similar to mainshock-aftershock sequences. Thus, we may be able to 'predict' what size earthquakes to expect at The Geysers following a large distant earthquake. Highlights ► Template matching event detection enhances statistical triggering test quality. ► Maximum triggered earthquake size positively correlates with dynamic stress. ► However, when and where triggering will occur is not easily 'predictable'.

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Section: Localized Stress Changesmentioning

confidence: 99%