Currently browsing tag

The Geysers

The Geysers geothermal field

Paper in GRL on non-double-couple components at The Geysers geothermal field

Finally we published a paper related to investigation of seismic moment tensors of microseismic events at The Geysers geothermal field.

Reference

Martínez-Garzón, P., Kwiatek, G., Bohnhoff, M., and G. Dresen (2017). Volumetric components in the earthquake source related to fluid injection and stress state. Geophys. Res. Lett. 44, DOI: 10.1002/2016GL071963. [ Article Page ]

Abstract

We investigate source processes of fluid-induced seismicity from The Geysers geothermal
reservoir in California to determine their relation with hydraulic operations and improve the corresponding seismic hazard estimates. Analysis of 869 well-constrained full moment tensors (Mw 0.8–3.5) reveals significant non-double-couple components (>25%) for about 65% of the events. Volumetric deformation is governed by cumulative injection rates with larger non-double-couple components observed near the wells and during high injection periods. Source mechanisms are magnitude dependent and vary significantly between faulting regimes. Normal faulting events (Mw<2) reveal substantial volumetric components indicating dilatancy in contrast to strike-slip events that have a dominant double-couple source. Volumetric components indicating closure of cracks in the source region are mostly found for reverse faulting events with Mw>2.5. Our results imply that source processes and magnitudes of fluid-induced seismic events are strongly affected by the hydraulic operations, the reservoir stress state, and the faulting regime.

New paper on fault instability at The Geysers

We published a new paper in Journal of Geophysical Research: Solid Earth that discusses the influence of long-term fluid injection on fault reactivation potential at The Geysers geothermal field, California.

References:

Martínez-Garzón, P., Kwiatek, G., Bohnhoff, M., and G. Dresen (2016). Impact of fluid injection on fracture reactivation at The Geysers geothermal field. J. Geophys. Res. 121, DOI: 10.1002/2016JB013137. [ Article Page ]

Paper on the influence of pore pressure changes on stress tensor inversion parameters

Another paper! This time we discuss the influence of temporal changes in pore pressure on the results of stress tensor inversion from focal mechanisms, with the special focus on stress shape ratio coefficient. There is also a neat presentation of the effects using the data from The Geysers geothermal field. The paper has been published in Geophysical Research Letters. Have fun!

Reference:

Martínez-Garzón, P., Vavryčuk, V., Kwiatek, G., and M. Bohnhoff. Sensitivity of stress inversion of focal mechanisms to pore pressure changes (2016). Geophys. Res. Lett., 43, 8441-8450, DOI: 10.1002/2016GL070145. [ Article Page ]

Two new papers on Induced Seismicity

We just published two new papers related to analysis of induced seismicity. First paper discusses the effects of long-term fluid injection on induced seismicity parameters and maximum likely magnitude at The Geysers geothermal field. In the second paper we perform the statistical analysis of couple of induced seismicity datasets and discuss the violations of Gutenberg-Richter relation in anthropocentric seismicity.

References:

  • Urban, P., S. Lasocki, P. Blascheck, A. F. do Nascimento, N. Van Giang, and G. Kwiatek (2015). Violations of Gutenberg–Richter Relation in Anthropogenic Seismicity, Pure Appl. Geophys. 1–21, DOI: 10.1007/s00024-015-1188-5. [ Article page ]
  • Kwiatek, G., P. Martínez-Garzón, G. Dresen, M. Bohnhoff, H. Sone, and C. Hartline (2015). Effects of long-term fluid injection on induced seismicity parameters and maximum magnitude in northwestern part of The Geysers geothermal field, J. Geophys. Res. 120, (submitted), DOI: 10.1002/2015JB012362. [ Article Page ]

 

New JGR paper on The Geysers

We published another paper on analysis of induced seismicity in The Geysers geothermal field in California, United States:

Martínez-Garzón, P., Kwiatek, G., Sone, H., Bohnhoff, M., Dresen, G., and C. Hartline (2014). Spatiotemporal changes, faulting regimes and source-parameters of induced seismicity: A case study from The Geysers geothermal field, J. Geophys. Res. 119, DOI: 10.1002/2014JB011385