Locating tremor using stacked products of correlations
We introduce a back-projection method to locate tremor sources using products of cross-correlation envelopes of time series between seismic stations. For a given subset of n stations, we calculate the (n − 1)th-order product of cross-correlation envelopes and we stack the back-projected products ove...
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Online Access: | http://hdl.handle.net/11585/658102 https://doi.org/10.1002/2016GL072272 http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1944-8007/issues?year=2012 |
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ftunibolognairis:oai:cris.unibo.it:11585/658102 2024-04-14T08:13:43+00:00 Locating tremor using stacked products of correlations Li, Ka Lok Sadeghisorkhani, Hamzeh Sgattoni, Giulia Gudmundsson, Olafur Roberts, Roland Li, Ka Lok* Sadeghisorkhani, Hamzeh Sgattoni, Giulia Gudmundsson, Olafur Roberts, Roland 2017 ELETTRONICO http://hdl.handle.net/11585/658102 https://doi.org/10.1002/2016GL072272 http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1944-8007/issues?year=2012 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000400186500022 volume:44 issue:7 firstpage:3156 lastpage:3164 numberofpages:9 journal:GEOPHYSICAL RESEARCH LETTERS http://hdl.handle.net/11585/658102 doi:10.1002/2016GL072272 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85017518196 http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1944-8007/issues?year=2012 correlation interferometry source location tremor location volcanic tremor Geophysic Earth and Planetary Sciences (all) info:eu-repo/semantics/article 2017 ftunibolognairis https://doi.org/10.1002/2016GL072272 2024-03-21T18:02:12Z We introduce a back-projection method to locate tremor sources using products of cross-correlation envelopes of time series between seismic stations. For a given subset of n stations, we calculate the (n − 1)th-order product of cross-correlation envelopes and we stack the back-projected products over combinations of station subsets. We show that compared to existing correlation methods and for realistic signal and noise characteristics, this way of combining information can significantly reduce the effects of correlated (spurious or irrelevant signals) and uncorrelated noise. Each back-projected product constitutes an individual localized estimate of the source locations, as opposed to a hyperbola for the existing correlation techniques, assuming a uniform velocity in two dimensions. We demonstrate the method with synthetic examples and a real-data example from tremor at Katla Volcano, Iceland, in July 2011. Despite very complex near-surface structure, including strong topography and thick ice cover, the method appears to produce robust estimates of tremor location. Article in Journal/Newspaper Iceland Katla IRIS Università degli Studi di Bologna (CRIS - Current Research Information System) Katla ENVELOPE(-19.062,-19.062,63.631,63.631) Geophysical Research Letters 44 7 3156 3164 |
institution |
Open Polar |
collection |
IRIS Università degli Studi di Bologna (CRIS - Current Research Information System) |
op_collection_id |
ftunibolognairis |
language |
English |
topic |
correlation interferometry source location tremor location volcanic tremor Geophysic Earth and Planetary Sciences (all) |
spellingShingle |
correlation interferometry source location tremor location volcanic tremor Geophysic Earth and Planetary Sciences (all) Li, Ka Lok Sadeghisorkhani, Hamzeh Sgattoni, Giulia Gudmundsson, Olafur Roberts, Roland Locating tremor using stacked products of correlations |
topic_facet |
correlation interferometry source location tremor location volcanic tremor Geophysic Earth and Planetary Sciences (all) |
description |
We introduce a back-projection method to locate tremor sources using products of cross-correlation envelopes of time series between seismic stations. For a given subset of n stations, we calculate the (n − 1)th-order product of cross-correlation envelopes and we stack the back-projected products over combinations of station subsets. We show that compared to existing correlation methods and for realistic signal and noise characteristics, this way of combining information can significantly reduce the effects of correlated (spurious or irrelevant signals) and uncorrelated noise. Each back-projected product constitutes an individual localized estimate of the source locations, as opposed to a hyperbola for the existing correlation techniques, assuming a uniform velocity in two dimensions. We demonstrate the method with synthetic examples and a real-data example from tremor at Katla Volcano, Iceland, in July 2011. Despite very complex near-surface structure, including strong topography and thick ice cover, the method appears to produce robust estimates of tremor location. |
author2 |
Li, Ka Lok* Sadeghisorkhani, Hamzeh Sgattoni, Giulia Gudmundsson, Olafur Roberts, Roland |
format |
Article in Journal/Newspaper |
author |
Li, Ka Lok Sadeghisorkhani, Hamzeh Sgattoni, Giulia Gudmundsson, Olafur Roberts, Roland |
author_facet |
Li, Ka Lok Sadeghisorkhani, Hamzeh Sgattoni, Giulia Gudmundsson, Olafur Roberts, Roland |
author_sort |
Li, Ka Lok |
title |
Locating tremor using stacked products of correlations |
title_short |
Locating tremor using stacked products of correlations |
title_full |
Locating tremor using stacked products of correlations |
title_fullStr |
Locating tremor using stacked products of correlations |
title_full_unstemmed |
Locating tremor using stacked products of correlations |
title_sort |
locating tremor using stacked products of correlations |
publishDate |
2017 |
url |
http://hdl.handle.net/11585/658102 https://doi.org/10.1002/2016GL072272 http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1944-8007/issues?year=2012 |
long_lat |
ENVELOPE(-19.062,-19.062,63.631,63.631) |
geographic |
Katla |
geographic_facet |
Katla |
genre |
Iceland Katla |
genre_facet |
Iceland Katla |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000400186500022 volume:44 issue:7 firstpage:3156 lastpage:3164 numberofpages:9 journal:GEOPHYSICAL RESEARCH LETTERS http://hdl.handle.net/11585/658102 doi:10.1002/2016GL072272 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85017518196 http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1944-8007/issues?year=2012 |
op_doi |
https://doi.org/10.1002/2016GL072272 |
container_title |
Geophysical Research Letters |
container_volume |
44 |
container_issue |
7 |
container_start_page |
3156 |
op_container_end_page |
3164 |
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1796311773710647296 |