In Situ Vp/Vs ratios beneath the Salton Sea Geothermal Field, southern California

Guoqing Lin

Submitted October 2018, SCEC Contribution #8919

The Salton Sea Geothermal Field is located on the southeastern shore of Salton Sea and has been facilitated with many geothermal units in the past few decades. In order to investigate possible effect of pore fluid pressure on seismic parameters due to the long-term production process, I apply a high-resolution method to estimate the compressional- to shear-wave velocity ratios Vp/Vs for similar earthquake clusters using waveform cross-correlation data. The in situ Vp/Vs ratios for the six selected clusters vary from 1.510 to 1.811 with the calculated uncertainties below 0.02. Correlations with the heat flow and well production data indicate that the near-source Vp/Vs ratios strongly depend on the subsurface natural properties, but are influenced by the amount of injection volume throughout the production period.

Citation
Lin, G. (2018). In Situ Vp/Vs ratios beneath the Salton Sea Geothermal Field, southern California. Scientific Reports, (submitted).