Small-aperture-array translational and rotational seismograms from distant sources - An example of the Jan Mayen Mw 6.8 of 30 August 2012 earthquake
We present the seismic rotation rate due to the earthquake of Mw 6.7 at the Jan Mayen island, obtained from broad-band seismograms at a distance of about 2740 km. The order of magnitude of the rotation rate amplitude is only 10-9 rad/s in this case. It is studied with a focus on rotation-to-translat...
Published in: | Physics of the Earth and Planetary Interiors |
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Online Access: | https://doi.org/10.1016/j.pepi.2016.03.013 http://hdl.handle.net/11104/0265172 |
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ftczacademyscien:oai:asep.lib.cas.cz:CavUnEpca/0467005 2024-02-11T10:05:21+01:00 Small-aperture-array translational and rotational seismograms from distant sources - An example of the Jan Mayen Mw 6.8 of 30 August 2012 earthquake Brokešová, J. Málek, J. (Jiří) 2016 https://doi.org/10.1016/j.pepi.2016.03.013 http://hdl.handle.net/11104/0265172 eng eng doi:10.1016/j.pepi.2016.03.013 urn:pissn: 0031-9201 urn:eissn: 1872-7395 http://hdl.handle.net/11104/0265172 seismic rotation true backazimuth apparent seismic phase velocity Rayleigh-wave dispersion info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2016 ftczacademyscien https://doi.org/10.1016/j.pepi.2016.03.013 2024-01-16T17:17:10Z We present the seismic rotation rate due to the earthquake of Mw 6.7 at the Jan Mayen island, obtained from broad-band seismograms at a distance of about 2740 km. The order of magnitude of the rotation rate amplitude is only 10-9 rad/s in this case. It is studied with a focus on rotation-to-translation relations. A joint analysis of the rotational and translational data allowed us to determine the true backazimuth and phase velocity of S- and Rayleigh waves. For the surface waves, we studied the frequency dependence of both the backazimuth and phase velocity (wave dispersion). The results are independently confirmed by a method based on time delays between translational records within a small-aperture array. Both methods revealed an unusual velocity drop in the dispersion curve between the periods of 18 and 22 s. This feature may be an indication of a low-velocity zone in the lower crust. Article in Journal/Newspaper Jan Mayen Jan Mayen Island The Czech Academy of Sciences: Publication Activity (ASEP) Jan Mayen Physics of the Earth and Planetary Interiors 256 1 12 |
institution |
Open Polar |
collection |
The Czech Academy of Sciences: Publication Activity (ASEP) |
op_collection_id |
ftczacademyscien |
language |
English |
topic |
seismic rotation true backazimuth apparent seismic phase velocity Rayleigh-wave dispersion |
spellingShingle |
seismic rotation true backazimuth apparent seismic phase velocity Rayleigh-wave dispersion Brokešová, J. Málek, J. (Jiří) Small-aperture-array translational and rotational seismograms from distant sources - An example of the Jan Mayen Mw 6.8 of 30 August 2012 earthquake |
topic_facet |
seismic rotation true backazimuth apparent seismic phase velocity Rayleigh-wave dispersion |
description |
We present the seismic rotation rate due to the earthquake of Mw 6.7 at the Jan Mayen island, obtained from broad-band seismograms at a distance of about 2740 km. The order of magnitude of the rotation rate amplitude is only 10-9 rad/s in this case. It is studied with a focus on rotation-to-translation relations. A joint analysis of the rotational and translational data allowed us to determine the true backazimuth and phase velocity of S- and Rayleigh waves. For the surface waves, we studied the frequency dependence of both the backazimuth and phase velocity (wave dispersion). The results are independently confirmed by a method based on time delays between translational records within a small-aperture array. Both methods revealed an unusual velocity drop in the dispersion curve between the periods of 18 and 22 s. This feature may be an indication of a low-velocity zone in the lower crust. |
format |
Article in Journal/Newspaper |
author |
Brokešová, J. Málek, J. (Jiří) |
author_facet |
Brokešová, J. Málek, J. (Jiří) |
author_sort |
Brokešová, J. |
title |
Small-aperture-array translational and rotational seismograms from distant sources - An example of the Jan Mayen Mw 6.8 of 30 August 2012 earthquake |
title_short |
Small-aperture-array translational and rotational seismograms from distant sources - An example of the Jan Mayen Mw 6.8 of 30 August 2012 earthquake |
title_full |
Small-aperture-array translational and rotational seismograms from distant sources - An example of the Jan Mayen Mw 6.8 of 30 August 2012 earthquake |
title_fullStr |
Small-aperture-array translational and rotational seismograms from distant sources - An example of the Jan Mayen Mw 6.8 of 30 August 2012 earthquake |
title_full_unstemmed |
Small-aperture-array translational and rotational seismograms from distant sources - An example of the Jan Mayen Mw 6.8 of 30 August 2012 earthquake |
title_sort |
small-aperture-array translational and rotational seismograms from distant sources - an example of the jan mayen mw 6.8 of 30 august 2012 earthquake |
publishDate |
2016 |
url |
https://doi.org/10.1016/j.pepi.2016.03.013 http://hdl.handle.net/11104/0265172 |
geographic |
Jan Mayen |
geographic_facet |
Jan Mayen |
genre |
Jan Mayen Jan Mayen Island |
genre_facet |
Jan Mayen Jan Mayen Island |
op_relation |
doi:10.1016/j.pepi.2016.03.013 urn:pissn: 0031-9201 urn:eissn: 1872-7395 http://hdl.handle.net/11104/0265172 |
op_doi |
https://doi.org/10.1016/j.pepi.2016.03.013 |
container_title |
Physics of the Earth and Planetary Interiors |
container_volume |
256 |
container_start_page |
1 |
op_container_end_page |
12 |
_version_ |
1790602372258463744 |