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/2122/15764 https://doi.org/10.1002/2016GL072272 |
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ftingv:oai:www.earth-prints.org:2122/15764 2023-05-15T16:50:11+02:00 Locating tremor using stacked products of correlations Li, Ka Lok Sadeghisorkhani, Hamzeh Sgattoni, Giulia Gudmundsson, Ólafur Roberts, Roland #PLACEHOLDER_PARENT_METADATA_VALUE# 2017 http://hdl.handle.net/2122/15764 https://doi.org/10.1002/2016GL072272 en eng Wiley-AGU Geophysical Research Letters /44 (2017) 0094-8276 1944-8007 http://hdl.handle.net/2122/15764 doi:10.1002/2016GL072272 restricted article 2017 ftingv https://doi.org/10.1002/2016GL072272 2022-12-27T23:26:23Z 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. Published 3156–3164 3T. Fisica dei terremoti e Sorgente Sismica 4V. Processi pre-eruttivi 5V. Processi eruttivi e post-eruttivi JCR Journal Article in Journal/Newspaper Iceland Katla Earth-Prints (Istituto Nazionale di Geofisica e Vulcanologia) Katla ENVELOPE(-19.062,-19.062,63.631,63.631) Geophysical Research Letters 44 7 3156 3164 |
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Open Polar |
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Earth-Prints (Istituto Nazionale di Geofisica e Vulcanologia) |
op_collection_id |
ftingv |
language |
English |
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. Published 3156–3164 3T. Fisica dei terremoti e Sorgente Sismica 4V. Processi pre-eruttivi 5V. Processi eruttivi e post-eruttivi JCR Journal |
author2 |
#PLACEHOLDER_PARENT_METADATA_VALUE# |
format |
Article in Journal/Newspaper |
author |
Li, Ka Lok Sadeghisorkhani, Hamzeh Sgattoni, Giulia Gudmundsson, Ólafur Roberts, Roland |
spellingShingle |
Li, Ka Lok Sadeghisorkhani, Hamzeh Sgattoni, Giulia Gudmundsson, Ólafur Roberts, Roland Locating tremor using stacked products of correlations |
author_facet |
Li, Ka Lok Sadeghisorkhani, Hamzeh Sgattoni, Giulia Gudmundsson, Ólafur 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 |
publisher |
Wiley-AGU |
publishDate |
2017 |
url |
http://hdl.handle.net/2122/15764 https://doi.org/10.1002/2016GL072272 |
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 |
Geophysical Research Letters /44 (2017) 0094-8276 1944-8007 http://hdl.handle.net/2122/15764 doi:10.1002/2016GL072272 |
op_rights |
restricted |
op_doi |
https://doi.org/10.1002/2016GL072272 |
container_title |
Geophysical Research Letters |
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44 |
container_issue |
7 |
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3156 |
op_container_end_page |
3164 |
_version_ |
1766040359675101184 |