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

DOI 10.15121/1768008

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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

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
A2  - Schoenball, Martin
A3  - Cook, Paul
A4  - Soom, Florian
A5  - Ulrich, Craig
A6  - Hopp, Chet
A7  - Kneafsey, Timothy
A8  - Ajo-Franklin, Jonathan
A9  - 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  -

Export Citation to RIS

Guglielmi, Yves, et al. EGS Collab Experiment 1: In-situ observation of pre-, co- and post-seismic shear slip preceding hydraulic fracturing . Lawrence Berkeley National Laboratory, 22 May, 2018, Geothermal Data Repository. https://doi.org/10.15121/1768008.

Guglielmi, Y., Schoenball, M., Cook, P., Soom, F., Ulrich, C., Hopp, C., Kneafsey, T., Ajo-Franklin, J., & Dobson, P. (2018). EGS Collab Experiment 1: In-situ observation of pre-, co- and post-seismic shear slip preceding hydraulic fracturing . [Data set]. Geothermal Data Repository. Lawrence Berkeley National Laboratory. https://doi.org/10.15121/1768008

Guglielmi, Yves, Martin Schoenball, Paul Cook, Florian Soom, Craig Ulrich, Chet Hopp, Timothy Kneafsey, Jonathan Ajo-Franklin, and Patrick Dobson. EGS Collab Experiment 1: In-situ observation of pre-, co- and post-seismic shear slip preceding hydraulic fracturing . Lawrence Berkeley National Laboratory, May, 22, 2018.  Distributed by Geothermal Data Repository. https://doi.org/10.15121/1768008

@misc{GDR_Dataset_1289,
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.

},
url = {https://gdr.openei.org/submissions/1289},
year = {2018},
howpublished = {Geothermal Data Repository, Lawrence Berkeley National Laboratory, https://doi.org/10.15121/1768008},
note = {Accessed: 2025-04-22},
doi = {10.15121/1768008}
}

https://dx.doi.org/10.15121/1768008

Details

Data from May 22, 2018

Last updated Oct 25, 2023

Submitted Feb 26, 2021