Work Description

Title: Seismograms of earthquake pairs in the injection experiment Open Access Deposited

http://creativecommons.org/licenses/by-nc/4.0/
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Methodology
  • The seismic data is collected from an injection experiment at 280 m depth within the Low Noise Underground Laboratory facility (LSBB,  http://lsbb.eu) in France (Guglielmi et al, 2015). A series of eleven injection tests were performed to reactivate selected geological features belonging to the damaged zone (20 m thick) of a kilometer-long inactive fault (Figure 1). A borehole probe, called SIMFIP (Guglielmi et al., 2014), was used to inject water into 2.4 m long sections isolated between packers in vertical boreholes. At the injection point, this probe was also used to monitor the fluid pressure, the flowrate and the deformation through optical fiber sensors. To monitor seismicity, 14 vertical and 8 3-component accelerometers were set on the gallery floor and on adjacent boreholes, respectively, at distances of 3-20 meters from the injection. These 10Hz-4kHz sensors allow the analysis of the seismicity in a broad frequency range. For more details about this experiment, we refer the reader to Duboeuf et al. (2017) and De Barros et al. (2018). We use seismic data recorded by the vertical component of the 22 sensors at a rate of 10000 samples/s to carry out a spectral ratio analysis of events with highly-similar waveforms (Abercrombie, 2015; Huang et al., 2016). We cross-correlate waveforms of previously detected earthquakes, including both P– and S– waves filtered between 200 and 2000 Hz, and identify pairs of earthquakes that have cross-correlation coefficients higher than 0.8 at more than 3 stations.
Description
  • Numerous small and moderate injection-induced earthquakes have been recorded in North America, Europe and Asia. Here we present a detailed analysis about microearthquakes in an in-situ injection-induced earthquake experiment, which provides an unprecedented opportunity to investigate the mechanisms of induced earthquakes. Our analysis illuminates meter-scale earthquake sources distributed in a network of preexisting rock fractures. The majority of induced earthquakes in our analysis happened when injection pressure reached a peak, indicating a direct response of rock fractures to fluid pressure perturbation. But the relatively low ratio of stress drop to crustal strength reveals that a very small fraction of the crustal shear strength is released by earthquakes, supporting the previous notion that fluid injection induces large aseismic deformation during the experiment.

  • Citation for dataset: Huang, Y., De Barros, L. (2019). Seismograms of earthquake pairs in the injection experiment [Data set]. University of Michigan - Deep Blue.
Creator
Depositor
  • yiheh@umich.edu
Contact information
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Funding agency
  • Other Funding Agency
Other Funding agency
  • French government, through the HYDROSEIS project under contract ANR-13-JS06-0004-01
Keyword
Citations to related material
  • Huang, Y., De Barros, L., Cappa, F. (2019). Illuminating the Rupturing of Microseismic Sources in an Injection‐Induced Earthquake Experiment. Geophysical Research Letters, 46(16), 9563-9572. https://doi.org/10.1029/2019GL083856
Resource type
Curation notes
  • Nov. 18 2019: added citation to related material to record.
Last modified
  • 11/18/2019
Published
  • 11/14/2019
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To Cite this Work:
Huang, Y. (2019). Seismograms of earthquake pairs in the injection experiment [Data set]. University of Michigan - Deep Blue.

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