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

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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.

Citation Formats

Lawrence Berkeley National Laboratory. (2018). EGS Collab Experiment 1: In-situ observation of pre-, co- and post-seismic shear slip preceding hydraulic fracturing [data set]. Retrieved from https://dx.doi.org/10.15121/1768008.
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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., 22 May, 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. https://dx.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. https://dx.doi.org/10.15121/1768008. https://gdr.openei.org/submissions/1289.
@div{oedi_4048, title = {EGS Collab Experiment 1: In-situ observation of pre-, co- and post-seismic shear slip preceding hydraulic fracturing }, author = {Guglielmi, Yves, Schoenball, Martin, Cook, Paul, Soom, Florian, Ulrich, Craig, Hopp, Chet, Kneafsey, Timothy, 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}, url = {https://gdr.openei.org/submissions/1289}, journal = {}, number = , volume = , place = {United States}, year = {2018}, month = {05}}
https://dx.doi.org/10.15121/1768008

Details

Data from May 22, 2018

Last updated Jul 16, 2021

Submitted Feb 26, 2021

Organization

Lawrence Berkeley National Laboratory

Contact

Yves Guglielmi

510.486.7626

Authors

Yves Guglielmi

Lawrence Berkeley National Laboratory

Martin Schoenball

NAGRA

Paul Cook

Lawrence Berkeley National Laboratory

Florian Soom

Lawrence Berkeley National Laboratory

Craig Ulrich

Lawrence Berkeley National Laboratory

Chet Hopp

Lawrence Berkeley National Laboratory

Timothy Kneafsey

Lawrence Berkeley National Laboratory

Jonathan Ajo-Franklin

Rice University

Patrick Dobson

Lawrence Berkeley National Laboratory

Research Areas

DOE Project Details

Project Name EGS Collab

Project Lead Lauren Boyd

Project Number EE0032708

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