Machine learning reveals cyclic changes in seismic source spectra in Geysers geothermal field
The earthquake rupture process comprises complex interactions of stress, fracture, and frictional properties. New machine learning methods demonstrate great potential to reveal patterns in time-dependent spectral properties of seismic signals and enable identification of changes in faulting processe...
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| Veröffentlicht in: | Science advances 2018-05, Vol.4 (5), p.eaao2929-eaao2929 |
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| creator | Holtzman, Benjamin K Paté, Arthur Paisley, John Waldhauser, Felix Repetto, Douglas |
| description | The earthquake rupture process comprises complex interactions of stress, fracture, and frictional properties. New machine learning methods demonstrate great potential to reveal patterns in time-dependent spectral properties of seismic signals and enable identification of changes in faulting processes. Clustering of 46,000 earthquakes of 0.3 <
< 1.5 from the Geysers geothermal field (CA) yields groupings that have no reservoir-scale spatial patterns but clear temporal patterns. Events with similar spectral properties repeat on annual cycles within each cluster and track changes in the water injection rates into the Geysers reservoir, indicating that changes in acoustic properties and faulting processes accompany changes in thermomechanical state. The methods open new means to identify and characterize subtle changes in seismic source properties, with applications to tectonic and geothermal seismicity. |
| doi_str_mv | 10.1126/sciadv.aao2929 |
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| subjects | Geology GEOTHERMAL ENERGY SciAdv r-articles Science & Technology - Other Topics |
| title | Machine learning reveals cyclic changes in seismic source spectra in Geysers geothermal field |
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