Design and implementation of a traffic light system for deep geothermal well stimulation in Finland

Thomas Ader, Michael Chendorain, Matthew Free, Tero Saarno, Pekka Heikkinen, Peter Eric Malin, Peter Leary, Grzegorz Kwiatek, Georg Dresen, Felix Bluemle, Tommi Vuorinen

Tutkimustuotos: ArtikkelijulkaisuArtikkeliTieteellinenvertaisarvioitu

Kuvaus

We describe the design and implementation of a traffic light system (TLS) created for the stimulation phase of a 6.1-km-deep geothermal well in the Helsinki area, Finland. Because of the lack of local seismic data to calibrate the TLS, the TLS thresholds have been proposed on the basis of two parameters: acceptable ground motion levels and probabilities to reach these levels, which were then used to establish TLS magnitudes. A peak ground velocity (PGV) of 1 mm/s associated with a ML ≥ 1 event, or a ML ≥ 1.2 event alone, triggered an Amber alert. A PGV of 7.5 mm/s associated with a ML ≥ 2.1 event triggered a Red alert, where ML was a local “Helsinki” magnitude. Specific thresholds based on PGV and peak ground acceleration were gathered for critical infrastructure sites and related to earthquake magnitudes in a probabilistic way. The implementation of the TLS during the stimulation showed that the selected thresholds were reasonably conservative. Some of the Amber events were reportedly felt or heard, but the public opinion remained very favourable to the project. Measured ground motions were too low to have any impact on the built environment and the stimulation was able to proceed without being impaired by the occurrence of a Red event. Seismic data acquired during the stimulation and lessons learnt are presented and used to revisit the TLS thresholds for potential future stimulations.
Alkuperäiskielienglanti
LehtiJournal of Seismology
ISSN1573-157X
DOI - pysyväislinkit
TilaJulkaistu - 29 elokuuta 2019
OKM-julkaisutyyppiA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä, vertaisarvioitu

Lainaa tätä

Ader, Thomas ; Chendorain, Michael ; Free, Matthew ; Saarno, Tero ; Heikkinen, Pekka ; Malin, Peter Eric ; Leary, Peter ; Kwiatek, Grzegorz ; Dresen, Georg ; Bluemle, Felix ; Vuorinen, Tommi. / Design and implementation of a traffic light system for deep geothermal well stimulation in Finland. Julkaisussa: Journal of Seismology. 2019.
@article{658055c1d18a4448bfb35905eac38ace,
title = "Design and implementation of a traffic light system for deep geothermal well stimulation in Finland",
abstract = "We describe the design and implementation of a traffic light system (TLS) created for the stimulation phase of a 6.1-km-deep geothermal well in the Helsinki area, Finland. Because of the lack of local seismic data to calibrate the TLS, the TLS thresholds have been proposed on the basis of two parameters: acceptable ground motion levels and probabilities to reach these levels, which were then used to establish TLS magnitudes. A peak ground velocity (PGV) of 1 mm/s associated with a ML ≥ 1 event, or a ML ≥ 1.2 event alone, triggered an Amber alert. A PGV of 7.5 mm/s associated with a ML ≥ 2.1 event triggered a Red alert, where ML was a local “Helsinki” magnitude. Specific thresholds based on PGV and peak ground acceleration were gathered for critical infrastructure sites and related to earthquake magnitudes in a probabilistic way. The implementation of the TLS during the stimulation showed that the selected thresholds were reasonably conservative. Some of the Amber events were reportedly felt or heard, but the public opinion remained very favourable to the project. Measured ground motions were too low to have any impact on the built environment and the stimulation was able to proceed without being impaired by the occurrence of a Red event. Seismic data acquired during the stimulation and lessons learnt are presented and used to revisit the TLS thresholds for potential future stimulations.",
author = "Thomas Ader and Michael Chendorain and Matthew Free and Tero Saarno and Pekka Heikkinen and Malin, {Peter Eric} and Peter Leary and Grzegorz Kwiatek and Georg Dresen and Felix Bluemle and Tommi Vuorinen",
year = "2019",
month = "8",
day = "29",
doi = "10.1007/s10950-019-09853-y",
language = "English",
journal = "Journal of Seismology",
issn = "1383-4649",
publisher = "Springer Netherlands",

}

Design and implementation of a traffic light system for deep geothermal well stimulation in Finland. / Ader, Thomas; Chendorain, Michael; Free, Matthew; Saarno, Tero; Heikkinen, Pekka; Malin, Peter Eric; Leary, Peter; Kwiatek, Grzegorz; Dresen, Georg; Bluemle, Felix; Vuorinen, Tommi.

julkaisussa: Journal of Seismology, 29.08.2019.

Tutkimustuotos: ArtikkelijulkaisuArtikkeliTieteellinenvertaisarvioitu

TY - JOUR

T1 - Design and implementation of a traffic light system for deep geothermal well stimulation in Finland

AU - Ader, Thomas

AU - Chendorain, Michael

AU - Free, Matthew

AU - Saarno, Tero

AU - Heikkinen, Pekka

AU - Malin, Peter Eric

AU - Leary, Peter

AU - Kwiatek, Grzegorz

AU - Dresen, Georg

AU - Bluemle, Felix

AU - Vuorinen, Tommi

PY - 2019/8/29

Y1 - 2019/8/29

N2 - We describe the design and implementation of a traffic light system (TLS) created for the stimulation phase of a 6.1-km-deep geothermal well in the Helsinki area, Finland. Because of the lack of local seismic data to calibrate the TLS, the TLS thresholds have been proposed on the basis of two parameters: acceptable ground motion levels and probabilities to reach these levels, which were then used to establish TLS magnitudes. A peak ground velocity (PGV) of 1 mm/s associated with a ML ≥ 1 event, or a ML ≥ 1.2 event alone, triggered an Amber alert. A PGV of 7.5 mm/s associated with a ML ≥ 2.1 event triggered a Red alert, where ML was a local “Helsinki” magnitude. Specific thresholds based on PGV and peak ground acceleration were gathered for critical infrastructure sites and related to earthquake magnitudes in a probabilistic way. The implementation of the TLS during the stimulation showed that the selected thresholds were reasonably conservative. Some of the Amber events were reportedly felt or heard, but the public opinion remained very favourable to the project. Measured ground motions were too low to have any impact on the built environment and the stimulation was able to proceed without being impaired by the occurrence of a Red event. Seismic data acquired during the stimulation and lessons learnt are presented and used to revisit the TLS thresholds for potential future stimulations.

AB - We describe the design and implementation of a traffic light system (TLS) created for the stimulation phase of a 6.1-km-deep geothermal well in the Helsinki area, Finland. Because of the lack of local seismic data to calibrate the TLS, the TLS thresholds have been proposed on the basis of two parameters: acceptable ground motion levels and probabilities to reach these levels, which were then used to establish TLS magnitudes. A peak ground velocity (PGV) of 1 mm/s associated with a ML ≥ 1 event, or a ML ≥ 1.2 event alone, triggered an Amber alert. A PGV of 7.5 mm/s associated with a ML ≥ 2.1 event triggered a Red alert, where ML was a local “Helsinki” magnitude. Specific thresholds based on PGV and peak ground acceleration were gathered for critical infrastructure sites and related to earthquake magnitudes in a probabilistic way. The implementation of the TLS during the stimulation showed that the selected thresholds were reasonably conservative. Some of the Amber events were reportedly felt or heard, but the public opinion remained very favourable to the project. Measured ground motions were too low to have any impact on the built environment and the stimulation was able to proceed without being impaired by the occurrence of a Red event. Seismic data acquired during the stimulation and lessons learnt are presented and used to revisit the TLS thresholds for potential future stimulations.

U2 - 10.1007/s10950-019-09853-y

DO - 10.1007/s10950-019-09853-y

M3 - Article

JO - Journal of Seismology

JF - Journal of Seismology

SN - 1383-4649

ER -