Häge, Martin and Blascheck, Patrick and Joswig, Manfred (2013) EGS hydraulic stimulation monitoring by surface arrays - location accuracy and completeness magnitude: the Basel Deep Heat Mining Project case study. Journal of Seismology, 17 (1). pp. 51-61. DOI: https://doi.org/10.1007/s10950-012-9312-9
Full text not available from this repository.Abstract
The potential and limits of monitoring induced seismicity by surface-based mini arrays was evaluated for the hydraulic stimulation of the Basel Deep Heat Mining Project. This project aimed at the exploitation of geothermal heat from a depth of about 4,630 m. As reference for our results, a network of borehole stations by Geothermal Explorers Ltd. provided ground truth information. We utilized array processing, sonogram event detection and outlier-resistant, graphical jackknife location procedures to compensate for the decrease in signal-to-noise ratio at the surface. We could correctly resolve the NNW–SSE striking fault plane by relative master event locations. Statistical analysis of our catalog data resulted in M L 0.36 as completeness magnitude, but with significant day-to-night dependency. To compare to the performance of borehole data with M W 0.9 as completeness magnitude, we applied two methods for converting M L to M W which raised our M C to M W in the range of 0.99–1.13. Further, the b value for the duration of our measurement was calculated to 1.14 (related to M L), respectively 1.66 (related to M W), but changes over time could not be resolved from the error bars.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Geothermal Enhanced geothermal systems Deep Heat Mining Basel Induced seismicity Mini arrays |
| Subjects: | Region > Switzerland > Basel Inducing technology > Geothermal energy production Methodology > Method and procesing |
| Project: | IS-EPOS project |