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  Using Array‐Derived Rotational Motion to Obtain Local Wave Propagation Properties From Earthquakes Induced by the 2018 Geothermal Stimulation in Finland

Taylor, G., Hillers, G., Vuorinen, T. A. T. (2021): Using Array‐Derived Rotational Motion to Obtain Local Wave Propagation Properties From Earthquakes Induced by the 2018 Geothermal Stimulation in Finland. - Geophysical Research Letters, 48, 6, e2020GL090403.
https://doi.org/10.1029/2020GL090403

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5006298 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5006298_1
Genre: Journal Article

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 Creators:
Taylor, G.1, 2, Author
Hillers, G.1, 2, Author
Vuorinen, T. A. T.1, 2, Author
Affiliations:
1External Organizations, ou_persistent22              
2Publikationen aller GIPP-unterstützten Projekte, Deutsches GeoForschungsZentrum, Potsdam, ou_44021              

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 Abstract: We estimate vertical rotation rates for 204 earthquakes that were induced by the 2018 stimulation of the Espoo/Helsinki geothermal reservoir from wavefield gradients across geophone arrays. The array-derived rotation rates from seismograms recorded at 6–9 km hypocentral distances vary between 10−9 and 10−7 rad s−1, indicating a comparable sensitivity to portable rotational instruments. Using co-located observations of translational and rotational motion, we estimate the local propagation direction and the apparent phase speed of SH waves, and compare these estimates with those obtained by S wave beamforming. Propagation directions generally align with the earthquake back azimuths, but both techniques show deviations indicative of heterogeneous seismic structure. The rotational method facilitates a station-by-station approach that resolves site specific variations that are controlled by the local geology. We measure apparent S wave speeds larger than 5 km s−1, consistent with steep incidence angles and high propagation velocities in the Fennoscandian Shield.

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Language(s): eng - English
 Dates: 2021-03-242021
 Publication Status: Finally published
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1029/2020GL090403
GFZPOF: p4 MESI
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Title: Geophysical Research Letters
Source Genre: Journal, SCI, Scopus, ab 2023 oa
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Pages: - Volume / Issue: 48 (6) Sequence Number: e2020GL090403 Start / End Page: - Identifier: ISSN: 1944-8007
ISSN: 0094-8276
CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/journals182
Publisher: American Geophysical Union (AGU)