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

Type Article
Date 2018-03
Language English
Author(s) Aiken ChastityORCID1, 2, Meng Xiaofeng3, 4, 5, Hardebeck Jeanne6
Affiliation(s) 1 : Univ Texas Austin, Austin, TX 78712 USA.
2 : IFREMER, Marine Geosci LAD, Plouzane, France.
3 : Univ Washington, Dept Earth & Space Sci, Seattle, WA 98195 USA.
4 : Univ Washington, eSci Inst, Seattle, WA 98195 USA.
5 : Univ Southern Calif, Southern Calif Earthquake Ctr, Los Angeles, CA USA.
6 : US Geol Survey, 345 Middlefield Rd, Menlo Pk, CA 94025 USA.
Source Earth And Planetary Science Letters (0012-821X) (Elsevier Science Bv), 2018-03 , Vol. 486 , P. 129-140
DOI 10.1016/j.epsl.2018.01.015
WOS© Times Cited 14
Keyword(s) dynamic triggering, template matching, earthquake, stress changes, The Geysers
Abstract

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.

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