Using array‐derived rotational motion to obtain local wave propagation properties from earthquakes induced by the 2018 geothermal stimulation in Finland

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dc.contributor University of Helsinki, Institute of Seismology en
dc.contributor University of Helsinki, Helsinki Institute of Urban and Regional Studies (Urbaria) en
dc.contributor University of Helsinki, Institute of Seismology en
dc.contributor.author Taylor, George
dc.contributor.author Hillers, Gregor
dc.contributor.author Vuorinen, Tommi
dc.date.accessioned 2021-04-29T13:22:03Z
dc.date.available 2021-04-29T13:22:03Z
dc.date.issued 2021-03-28
dc.identifier.citation Taylor , G , Hillers , G & Vuorinen , 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 , vol. 48 , no. 6 , ARTN e2020GL090403 . https://doi.org/10.1029/2020GL090403 en
dc.identifier.issn 0094-8276
dc.identifier.other PURE: 161158063
dc.identifier.other PURE UUID: 5448e2c2-6f7f-4cd6-9560-2bebc9dddbc0
dc.identifier.other WOS: 000635209100088
dc.identifier.other ORCID: /0000-0002-8186-012X/work/93077658
dc.identifier.other ORCID: /0000-0003-2341-1892/work/93077995
dc.identifier.uri http://hdl.handle.net/10138/329522
dc.description.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. en
dc.format.extent 11
dc.language.iso eng
dc.relation.ispartof Geophysical Research Letters
dc.rights en
dc.subject 1171 Geosciences en
dc.subject seismology en
dc.subject array analysis en
dc.subject induced seismicity en
dc.subject rotational motion en
dc.subject seismology en
dc.subject seismic arrays en
dc.subject seismic gradiometry en
dc.title Using array‐derived rotational motion to obtain local wave propagation properties from earthquakes induced by the 2018 geothermal stimulation in Finland en
dc.type Article
dc.description.version Peer reviewed
dc.identifier.doi https://doi.org/10.1029/2020GL090403
dc.type.uri info:eu-repo/semantics/other
dc.type.uri info:eu-repo/semantics/publishedVersion
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