Evidence of instantaneous dynamic triggering during the seismic sequence of year 2000 in south Iceland
We analyze the coseismic stress perturbation during the 17 June 2000 south Iceland seismic sequence; the main shock (Ms 6.6) was followed by three large events within a few tens of seconds (8, 26, and 30 s) located within 80 km. The aim of this paper is to investigate short-term fault interaction an...
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ftingv:oai:www.earth-prints.org:2122/2417 2023-05-15T16:47:43+02:00 Evidence of instantaneous dynamic triggering during the seismic sequence of year 2000 in south Iceland Antonioli, A. Belardinelli, M. E. Bizzarri, A. Vogfjord, K. S. Antonioli, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia Belardinelli, M. E.; Settore di Geofisica, Dipartimento di Fisica, Universita` di Bologna, Bologna, Italy. Bizzarri, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia Vogfjord, K. S.; Physics Department, Icelandic Meteorological Office, Reykjavik, Iceland. Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia Settore di Geofisica, Dipartimento di Fisica, Universita` di Bologna, Bologna, Italy. Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia Physics Department, Icelandic Meteorological Office, Reykjavik, Iceland. 2006 http://hdl.handle.net/2122/2417 https://doi.org/10.1029/2005JB003935 en eng Agu J. Geophys. Res. /111 (2006) http://hdl.handle.net/2122/2417 doi:10.1029/2005JB003935 restricted seismic sequence Iceland 2000 04. Solid Earth::04.06. Seismology::04.06.01. Earthquake faults: properties and evolution 04. Solid Earth::04.06. Seismology::04.06.02. Earthquake interactions and probability 04. Solid Earth::04.06. Seismology::04.06.03. Earthquake source and dynamics article 2006 ftingv https://doi.org/10.1029/2005JB003935 2022-07-29T06:04:26Z We analyze the coseismic stress perturbation during the 17 June 2000 south Iceland seismic sequence; the main shock (Ms 6.6) was followed by three large events within a few tens of seconds (8, 26, and 30 s) located within 80 km. The aim of this paper is to investigate short-term fault interaction and instantaneous triggering. This happens when a fault perturbed by a stress change fails before the end of the transient stress perturbation. We compute the shear, normal, and Coulomb stress changes as functions of time in a stratified elastic half-space by using discrete wave number and reflectivity methods. We calculate dynamic stresses caused by the main shock at the hypocenters of these three subsequent events. Our numerical results show that the onset of the last two events is slightly delayed with respect to the arrival time of the second positive peak of Coulomb stress variation, while the first event occurred after the first positive stress peak. We have also analyzed the response of a spring slider system representing a fault governed by a rate- and state-dependent friction law, perturbed by shear and normal stress variations caused by the main shock. The fault response to the computed stress perturbations is always clock advanced. We have found suitable constitutive parameters of the modeled fault that allow the instantaneous dynamic triggering of these three earthquakes. If the initial sliding velocity is comparable with the tectonic loading velocity, we obtained failure times close to the observed origin times for low values of the initial effective normal stress. Published B03302 JCR Journal reserved Article in Journal/Newspaper Iceland Earth-Prints (Istituto Nazionale di Geofisica e Vulcanologia) Journal of Geophysical Research: Solid Earth 111 B3 n/a n/a |
institution |
Open Polar |
collection |
Earth-Prints (Istituto Nazionale di Geofisica e Vulcanologia) |
op_collection_id |
ftingv |
language |
English |
topic |
seismic sequence Iceland 2000 04. Solid Earth::04.06. Seismology::04.06.01. Earthquake faults: properties and evolution 04. Solid Earth::04.06. Seismology::04.06.02. Earthquake interactions and probability 04. Solid Earth::04.06. Seismology::04.06.03. Earthquake source and dynamics |
spellingShingle |
seismic sequence Iceland 2000 04. Solid Earth::04.06. Seismology::04.06.01. Earthquake faults: properties and evolution 04. Solid Earth::04.06. Seismology::04.06.02. Earthquake interactions and probability 04. Solid Earth::04.06. Seismology::04.06.03. Earthquake source and dynamics Antonioli, A. Belardinelli, M. E. Bizzarri, A. Vogfjord, K. S. Evidence of instantaneous dynamic triggering during the seismic sequence of year 2000 in south Iceland |
topic_facet |
seismic sequence Iceland 2000 04. Solid Earth::04.06. Seismology::04.06.01. Earthquake faults: properties and evolution 04. Solid Earth::04.06. Seismology::04.06.02. Earthquake interactions and probability 04. Solid Earth::04.06. Seismology::04.06.03. Earthquake source and dynamics |
description |
We analyze the coseismic stress perturbation during the 17 June 2000 south Iceland seismic sequence; the main shock (Ms 6.6) was followed by three large events within a few tens of seconds (8, 26, and 30 s) located within 80 km. The aim of this paper is to investigate short-term fault interaction and instantaneous triggering. This happens when a fault perturbed by a stress change fails before the end of the transient stress perturbation. We compute the shear, normal, and Coulomb stress changes as functions of time in a stratified elastic half-space by using discrete wave number and reflectivity methods. We calculate dynamic stresses caused by the main shock at the hypocenters of these three subsequent events. Our numerical results show that the onset of the last two events is slightly delayed with respect to the arrival time of the second positive peak of Coulomb stress variation, while the first event occurred after the first positive stress peak. We have also analyzed the response of a spring slider system representing a fault governed by a rate- and state-dependent friction law, perturbed by shear and normal stress variations caused by the main shock. The fault response to the computed stress perturbations is always clock advanced. We have found suitable constitutive parameters of the modeled fault that allow the instantaneous dynamic triggering of these three earthquakes. If the initial sliding velocity is comparable with the tectonic loading velocity, we obtained failure times close to the observed origin times for low values of the initial effective normal stress. Published B03302 JCR Journal reserved |
author2 |
Antonioli, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia Belardinelli, M. E.; Settore di Geofisica, Dipartimento di Fisica, Universita` di Bologna, Bologna, Italy. Bizzarri, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia Vogfjord, K. S.; Physics Department, Icelandic Meteorological Office, Reykjavik, Iceland. Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia Settore di Geofisica, Dipartimento di Fisica, Universita` di Bologna, Bologna, Italy. Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia Physics Department, Icelandic Meteorological Office, Reykjavik, Iceland. |
format |
Article in Journal/Newspaper |
author |
Antonioli, A. Belardinelli, M. E. Bizzarri, A. Vogfjord, K. S. |
author_facet |
Antonioli, A. Belardinelli, M. E. Bizzarri, A. Vogfjord, K. S. |
author_sort |
Antonioli, A. |
title |
Evidence of instantaneous dynamic triggering during the seismic sequence of year 2000 in south Iceland |
title_short |
Evidence of instantaneous dynamic triggering during the seismic sequence of year 2000 in south Iceland |
title_full |
Evidence of instantaneous dynamic triggering during the seismic sequence of year 2000 in south Iceland |
title_fullStr |
Evidence of instantaneous dynamic triggering during the seismic sequence of year 2000 in south Iceland |
title_full_unstemmed |
Evidence of instantaneous dynamic triggering during the seismic sequence of year 2000 in south Iceland |
title_sort |
evidence of instantaneous dynamic triggering during the seismic sequence of year 2000 in south iceland |
publisher |
Agu |
publishDate |
2006 |
url |
http://hdl.handle.net/2122/2417 https://doi.org/10.1029/2005JB003935 |
genre |
Iceland |
genre_facet |
Iceland |
op_relation |
J. Geophys. Res. /111 (2006) http://hdl.handle.net/2122/2417 doi:10.1029/2005JB003935 |
op_rights |
restricted |
op_doi |
https://doi.org/10.1029/2005JB003935 |
container_title |
Journal of Geophysical Research: Solid Earth |
container_volume |
111 |
container_issue |
B3 |
container_start_page |
n/a |
op_container_end_page |
n/a |
_version_ |
1766037818568605696 |