eprintid: 2333 rev_number: 9 eprint_status: archive userid: 6 dir: disk0/00/00/23/33 datestamp: 2021-12-15 08:06:04 lastmod: 2021-12-15 08:06:04 status_changed: 2021-12-15 08:06:04 type: article metadata_visibility: show creators_name: Staszek, Monika creators_name: Rudzinski, Lukasz creators_name: Kwiatek, Grzegorz creators_id: mstaszek@igf.edu.pl creators_id: rudzin@igf.edu.pl creators_id: kwiatek@gfz-potsdam.de corp_creators: Institute of Geophysics, Polish Academy of Sciences, Warsaw, Poland corp_creators: Institute of Geophysics, Polish Academy of Sciences, Warsaw, Poland corp_creators: Helmholtz-Centre Potsdam, GFZ German Research Centre for Geosciences, Section 4.2: Geomechanics and Scientific Drilling, Potsdam, Germany title: Spatial and temporal multiplet analysis for identification of dominant fluid migration path at The Geysers geothermal field, California subjects: RU1_1 subjects: SG divisions: IP13 full_text_status: none abstract: Multiplet analysis is based on the identification of seismic events with very similar waveforms which are used then to enhance seismological analysis e.g. by precise relocation of sources. In underground fluid injection conditions, it is a tool frequently used for imaging of subsurface fracture system. We identify over 150 repeatedly activated seismic sources within seismicity cluster induced by fluid injection in NW part of The Geysers geothermal field (California). Majority of multiple events (ME) occur along N–S oriented planar structure which we interpret as a fault plane. Remaining ME are distributed along structures interpreted as fractures, forming together a system of interconnected cracks enabling fluid migration. Temporal analysis reveals that during periods of relatively low fluid injection the proportion of ME to non-multiple events is higher than during periods of high injection. Moreover, ME which occur within the fault differ in activity rate and source properties from ME designating the fractures and non-multiple events. In this study we utilize observed differences between ME occurring within various structures and non-multiple events to describe hydraulic conditions within the reservoir. We show that spatial and temporal analysis of multiplets can be used for identification and characterization of dominant fluid migration paths. date: 2021 date_type: published publication: Scientific Reports volume: 11 number: 1 publisher: Nature Publishing Group id_number: doi:10.1038/s41598-021-03267-y issn: 2045-2322 official_url: https://doi.org/10.1038/s41598-021-03267-y access_IS-EPOS: limited owner: Publisher acknowledgments2: IS-EPOS_platform citation: Staszek, Monika and Rudzinski, Lukasz and Kwiatek, Grzegorz (2021) Spatial and temporal multiplet analysis for identification of dominant fluid migration path at The Geysers geothermal field, California. Scientific Reports, 11 (1). DOI: https://doi.org/10.1038/s41598-021-03267-y