Static stress drop of induced earthquakes in seismic hazard assessment: Preliminary results from The Geysers geothermal site

Staszek, Monika and Orlecka-Sikora, Beata and Kwiatek, Grzegorz (2016) Static stress drop of induced earthquakes in seismic hazard assessment: Preliminary results from The Geysers geothermal site. In: 35th General Assembly of the European Seismological Commission, 4-10 September 2016, Trieste, Italy.

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Abstract

Static stress drop of induced earthquakes is a parameter which reflects the influence of induced seismicity on the stress field in reservoir rock. On the other hand, events occurrence time and localization depends on the previous stress distribution in the rock mass. Therefore, we decided to use static stress drop to assign areas of relatively higher probability of future event occurrence with respect to entire area of seismic activity. For analyses 354-event group of earthquakes with spectral parameters determined using spectral ratio method from NW part of The Geysers geothermal site was used. We analyzed distributions of interpolated stress drops, determined on the basis of events from constant moving time window using biharmonic spline interpolation method, for chosen groups and sequences of events. Some of the distributions reveal that events tend to occur in the areas of specific ranges of interpolated stress drop values what indicates a potential for future use of static stress drop in seismic hazard assessment. This work was partially supported within SHEER: "Shale Gas Exploration and Exploitation Induced Risks" project funded from Horizon 2020 – R&I Framework Programme, call H2020-LCE-2014-1.

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Item Type: Conference or Workshop Item (Speech)
Subjects: Methodology > Method and procesing > Stress field modeling > Technology induced stress field redistribution
Methodology > Method and procesing > Stress field modeling > Evolution of stress field changes
Region > USA > California > Geysers
Inducing technology > Geothermal energy production
Project: SHEER project > THE GEYSERS: geothermal energy production