Projekt per år
Sammanfattning
A seismic network was installed in Helsinki, Finland to monitor the response to an similar to 6-kilometer-deep geothermal stimulation experiment in 2018. We present initial results of multiple induced earthquake seismogram and ambient wavefield analyses. The used data are from parts of the borehole network deployed by the operating St1 Deep Heat Company, from surface broadband sensors and 100 geophones installed by the Institute of Seismology, University of Helsinki, and from Finnish National Seismic Network stations. Records collected in the urban environment contain many signals associated with anthropogenic activity. This results in time- and frequency-dependent variations of the signal-to-noise ratio of earthquake records from a 260-meter-deep borehole sensor compared to the combined signals of 24 collocated surface array sensors. Manual relocations of similar to 500 events indicate three distinct zones of induced earthquake activity that are consistent with the three clusters of seismicity identified by the company. The fault-plane solutions of 14 selected ML 0.6-1.8 events indicate a dominant reverse-faulting style, and the associated SH radiation patterns appear to control the first-order features of the macroseismic report distribution. Beamforming of earthquake data from six arrays suggests heterogeneous medium properties, in particular between the injection site and two arrays to the west and southwest. Ambient-noise cross-correlation functions reconstruct regional surface-wave propagation and path-dependent body-wave propagation. A 1D inversion of the weakly dispersive surface waves reveals average shear-wave velocities around 3.3 km/s below 20 m depth. Consistent features observed in relative velocity change time series and in temporal variations of a proxy for wavefield partitioning likely reflect the medium response to the stimulation. The resolution properties of the obtained data can inform future monitoring strategies and network designs around natural laboratories.
Originalspråk | engelska |
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Tidskrift | Seismological Research Letters |
Volym | 91 |
Nummer | 2 |
Sidor (från-till) | 770-786 |
Antal sidor | 17 |
ISSN | 0895-0695 |
DOI | |
Status | Publicerad - mars 2020 |
MoE-publikationstyp | A1 Tidskriftsartikel-refererad |
Vetenskapsgrenar
- 1171 Geovetenskaper
Projekt
- 1 Slutfört
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SEISMIC RISK - Mitigation of induced seismic risk in urban environments
Korja, A. (Principal Investigator), Fülöp, L. (Co-Principal Investigator), Putkinen, N. (Co-Principal Investigator), Junno, N. (Projektledare), Hillers, G. (Deltagare), Mäntyniemi, P. (Deltagare), Vuorinen, T. (Deltagare), Veikkolainen, T. (Deltagare), Bäcklund, P. (Deltagare), Oinonen, K. (Deltagare), Tuomisaari, J. M. (Deltagare), Tiira, T. (Deltagare), Rintamäki, A. E. (Deltagare), Voutilainen, A. I. (Deltagare), Sadeghibagherabadi, A. (Deltagare), Oksanen, T. J. (Deltagare), Rantanen, A. M. (Projektledare), Metsalo, K. V. A. (Projektledare) & Makkonen, E. I. A. (Deltagare)
21/08/2020 → 30/11/2023
Projekt: Forskningsprojekt
Forskningsdatauppsättningar
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A 100 3-component sensor deployment to monitor the 2018 EGS stimulation in Espoo/Helsinki, southern Finland - Datasets
Hillers, G. (Skapad av), Vuorinen, T. (Skapad av), Arola, E. (!!Data Collector), Katajisto, V. (!!Data Collector), Koskenniemi, P. (Medverkande), McKevitt, B. (!!Data Collector), Rezaei, S. (!!Data Collector), Rinne, L. A. (!!Data Collector), Salmenperä, I. E. (!!Data Collector), Seipäjärvi, P. J. (!!Data Collector), Väkevä, S. (!!Data Collector), Voutilainen, A. I. (!!Data Collector), Arhe, K. (Medverkande), Juntunen, A. K. (Medverkande), Keskinen, J. (Medverkande), Lindblom, P. (Medverkande), Oinonen, K. (Medverkande) & Tiira, T. (!!Other), GFZ Data Services, 2 okt. 2019
Datauppsättning
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ISUH waveform, time and location data products from stimulations of deep geothermal wells in Espoo in 2018
Vuorinen, T. (Skapad av), Veikkolainen, T. (Skapad av), Oinonen, K. (Skapad av), Hällsten, J. M. A. (Skapad av), Uski, M. (Skapad av), Heikkilä, T. M. (Medverkande), Koskenniemi, P. (!!Data Collector), Rintamäki, A. E. (!!Data Collector), Voutilainen, A. I. (Skapad av), Salmenperä, I. E. (Medverkande), Kortström, J. (Skapad av) & Tiira, T. (!!Other), Fairdata.fi, 13 jan. 2023
DOI: 10.23729/39cfac4f-4d0d-4fb4-83dc-6f67e8ba8dce
Datauppsättning
Utrustning
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Institute of Seismology's Network of Seismic Stations
Tiira, T. (Chef), Keskinen, J. (Operatör), Kortström, J. (Operatör), Lindblom, P. (Operatör), Seipäjärvi, P. J. (Operatör) & Juntunen, A. K. (Operatör)
Seismologiska institutetUtrustning/facilitet: Utrustning
Aktiviteter
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37th General Assembly of the European Seismological Commission
Mäntyniemi, P. (Poster presentation) & Uski, M. (Poster presentation)
20 sep. 2021 → 24 sep. 2021Aktivitet: Typer för deltagande i eller organisering av evenemang › Arrangemang av och deltagande i konferens/workshop/kurs/seminarium
Fil -
Geoterminen energia ja maanjäristykset Etelä-Suomessa
Vuorinen, T. (!!Speaker)
2 maj 2019Aktivitet: Typer för tal eller presentation › !!Invited talk
Fil -
Monitoring an Enhanced Geothermal System in Downtown Helsinki
Vuorinen, T. (!!Speaker), Hillers, G. (!!Speaker), Mäntyniemi, P. (!!Speaker), Uski, M. (!!Speaker), Oinonen, K. (!!Speaker) & Kortström, J. (!!Speaker)
15 okt. 2019Aktivitet: Typer för tal eller presentation › !!Oral presentation
Fil