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Title: EGS Collab Experiment 1: In-situ observation of pre-, co- and post-seismic shear slip preceding hydraulic fracturing

Abstract

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 amore » manuscript submitted to GRL, linked in this submission.« less

Authors:
; ; ; ; ; ; ; ;
Publication Date:
Other Number(s):
1289
DOE Contract Number:  
EE0032708
Research Org.:
USDOE Geothermal Data Repository (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Geothermal Technologies Program (EE-4G)
Collaborations:
Lawrence Berkeley National Laboratory
Subject:
15 Geothermal Energy
Keywords:
geothermal; energy; EGS; EGS Collab; SURF; Sanford Underground Research Facility; seismic; injection test; stimulation; slip vector; shear; axial; displacement; pressure; borehole displacement; deformation; SIMFIP; probe; borehole; E1-I; pre-slip; co-seismic; slip; post-seismic; afterslip; hydraulic; fracturing; in-situ
Geolocation:
44.3544, (-103.7465
OSTI Identifier:
1768008
DOI:
https://doi.org/10.15121/1768008
Project Location:

DOE DataExplorer Dataset Location Google Map

Citation Formats

Guglielmi, Yves, Schoenball, Martin, Cook, Paul, Soom, Florian, Ulrich, Craig, Hopp, Chet, Kneafsey, Timothy, Ajo-Franklin, Jonathan, and Dobson, Patrick. EGS Collab Experiment 1: In-situ observation of pre-, co- and post-seismic shear slip preceding hydraulic fracturing. United States: N. p., 2018. Web. doi:10.15121/1768008.
Guglielmi, Yves, Schoenball, Martin, Cook, Paul, Soom, Florian, Ulrich, Craig, Hopp, Chet, Kneafsey, Timothy, Ajo-Franklin, Jonathan, & Dobson, Patrick. EGS Collab Experiment 1: In-situ observation of pre-, co- and post-seismic shear slip preceding hydraulic fracturing. United States. doi:https://doi.org/10.15121/1768008
Guglielmi, Yves, Schoenball, Martin, Cook, Paul, Soom, Florian, Ulrich, Craig, Hopp, Chet, Kneafsey, Timothy, Ajo-Franklin, Jonathan, and Dobson, Patrick. 2018. "EGS Collab Experiment 1: In-situ observation of pre-, co- and post-seismic shear slip preceding hydraulic fracturing". United States. doi:https://doi.org/10.15121/1768008. https://www.osti.gov/servlets/purl/1768008. Pub date:Tue May 22 00:00:00 EDT 2018
@article{osti_1768008,
title = {EGS Collab Experiment 1: In-situ observation of pre-, co- and post-seismic shear slip preceding hydraulic fracturing},
author = {Guglielmi, Yves and Schoenball, Martin and Cook, Paul and Soom, Florian and Ulrich, Craig and Hopp, Chet and Kneafsey, Timothy and Ajo-Franklin, Jonathan and Dobson, Patrick},
abstractNote = {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.},
doi = {10.15121/1768008},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {5}
}