TY - DATA AB - Understanding the initiation and arrest of earthquakes is one of the long-standing challenges of seismology. Here we report on direct observations of borehole displacement by a meter-sized shear rupture induced by pressurization of metamorphic rock at 1.5 km depth. We observed the acceleration of sliding, followed by fast co-seismic slip and a transient afterslip phase. Total displacements were about 7, 5.5 and 9.5 micrometers, respectively for the observed pre-slip, co-seismic slip and afterslip. The observed pre-slip lasted about 0.4 seconds. Co-seismic slip was recorded by the 1 kHz displacement recording and a 12-component array of 3-C accelerometers sampled at 100 kHz. The observed afterslip is consistent with analytical models of arrest in a velocity-strengthening region and subsequent stress relaxation. The observed slip vector agrees with the activation of a bedding plane within the phyllite, which is corroborated by relocated seismic events that were observed during the later stages of the injection experiment. This submission includes the pressure and deformation data recorded by the SIMFIP probe during the first injection at the 164 ft (50 m) notch of borehole E1-I. The injection was performed on on 05/22/2018 as part of Experiment 1 of the EGS Collab project. This data accompanies a manuscript submitted to GRL, linked in this submission. AU - Guglielmi, Yves AU - Schoenball, Martin AU - Cook, Paul AU - Soom, Florian AU - Ulrich, Craig AU - Hopp, Chet AU - Kneafsey, Timothy AU - Ajo-Franklin, Jonathan AU - Dobson, Patrick DB - Geothermal Data Repository DP - Open EI | National Renewable Energy Laboratory DO - 10.15121/1768008 KW - geothermal KW - energy KW - EGS KW - EGS Collab KW - SURF KW - Sanford Underground Research Facility KW - seismic KW - injection test KW - stimulation KW - slip vector KW - shear KW - axial KW - displacement KW - pressure KW - borehole displacement KW - deformation KW - SIMFIP KW - probe KW - borehole KW - E1-I KW - pre-slip KW - co-seismic KW - slip KW - post-seismic KW - afterslip KW - hydraulic KW - fracturing KW - in-situ LA - English DA - 2018/05/22 PY - 2018 PB - Lawrence Berkeley National Laboratory T1 - EGS Collab Experiment 1: In-situ observation of pre-, co- and post-seismic shear slip preceding hydraulic fracturing UR - https://doi.org/10.15121/1768008 ER -