The seismological signature of cyclonic storms through the ears of a sensor array
Under certain conditions, ocean surface gravity waves (SGW) interact with the seafloor underneath to trigger relatively faint but measurable seismic waves known as ocean microseisms. Cyclonic storms (e.g. hurricanes, typhoons) wandering over the ocean are major (non-stationary) sources of the former,...
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ftsubggeo:oai:e-docs.geo-leo.de:11858/8340 2023-05-15T17:35:58+02:00 The seismological signature of cyclonic storms through the ears of a sensor array Pelaez, Julián Becker, Dirk Hadziioannou, Céline 2021 https://doi.org/10.23689/fidgeo-4000 http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/8340 eng eng 81. Jahrestagung der Deutschen Geophysikalischen Gesellschaft, 1-5.03.2021 Kiel, Germany. doi:10.23689/fidgeo-4000 http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/8340 CC BY 4.0 CC-BY ddc:550 ddc:621 ddc:004 ddc:534 Ambient seismic noise Seismology Oceanography Microseisms Cyclones Hurricanes Marine Geophysics Beamforming doc-type:conferenceObject 2021 ftsubggeo https://doi.org/10.23689/fidgeo-4000 2022-11-09T06:51:38Z Under certain conditions, ocean surface gravity waves (SGW) interact with the seafloor underneath to trigger relatively faint but measurable seismic waves known as ocean microseisms. Cyclonic storms (e.g. hurricanes, typhoons) wandering over the ocean are major (non-stationary) sources of the former, thus opening the possibility of tracking and studying cyclones by means of their corresponding microseims. For this purpose, we identified storm-related microseisms hidden in the ambient seismic wavefield via array processing. Polarization beamforming, a robust and well-known technique is implemented. The analyses hinge on surface waves (Love and Rayleigh) which, in contrast to P-waves, are stronger but only constrain direction of arrival (without source remoteness). We use a few land-based virtual seismic arrays surrounding the North Atlantic to investigate the signatures of major hurricanes in the microseismic band (0.05-0.16 Hz), in a joint attempt to continuously triangulate their tracks. Our findings show that storm microseisms are intermittently excited with modulated amplitude at localized oceanic regions, particularly over the shallow continental shelves and slopes, having maximum amplitudes virtually independent of storm category. In most cases no detection was possible over deep oceanic regions, nor at distant arrays. Additionally, the rear quadrants and trailing swells of the cyclone provide the optimum SGW spectrum for the generation of microseisms, often shifted more than 500 km off the "eye". As a result of the aforementioned and added to the strong attenuation of storm microseisms, the inversion of tracks or physical properties of storms using a few far-field arrays is discontinuous in most cases, being reliable only if benchmark atmospheric and/or oceanic data is available for comparison. Even if challenging due to the complexity of the coupled phenomena responsible for microseisms, the inversion of site properties, such as bathymetric parameters (e.g. depth, seabed geomorphology), near- bottom geology ... Conference Object North Atlantic GEO-LEOe-docs (FID GEO) |
institution |
Open Polar |
collection |
GEO-LEOe-docs (FID GEO) |
op_collection_id |
ftsubggeo |
language |
English |
topic |
ddc:550 ddc:621 ddc:004 ddc:534 Ambient seismic noise Seismology Oceanography Microseisms Cyclones Hurricanes Marine Geophysics Beamforming |
spellingShingle |
ddc:550 ddc:621 ddc:004 ddc:534 Ambient seismic noise Seismology Oceanography Microseisms Cyclones Hurricanes Marine Geophysics Beamforming Pelaez, Julián Becker, Dirk Hadziioannou, Céline The seismological signature of cyclonic storms through the ears of a sensor array |
topic_facet |
ddc:550 ddc:621 ddc:004 ddc:534 Ambient seismic noise Seismology Oceanography Microseisms Cyclones Hurricanes Marine Geophysics Beamforming |
description |
Under certain conditions, ocean surface gravity waves (SGW) interact with the seafloor underneath to trigger relatively faint but measurable seismic waves known as ocean microseisms. Cyclonic storms (e.g. hurricanes, typhoons) wandering over the ocean are major (non-stationary) sources of the former, thus opening the possibility of tracking and studying cyclones by means of their corresponding microseims. For this purpose, we identified storm-related microseisms hidden in the ambient seismic wavefield via array processing. Polarization beamforming, a robust and well-known technique is implemented. The analyses hinge on surface waves (Love and Rayleigh) which, in contrast to P-waves, are stronger but only constrain direction of arrival (without source remoteness). We use a few land-based virtual seismic arrays surrounding the North Atlantic to investigate the signatures of major hurricanes in the microseismic band (0.05-0.16 Hz), in a joint attempt to continuously triangulate their tracks. Our findings show that storm microseisms are intermittently excited with modulated amplitude at localized oceanic regions, particularly over the shallow continental shelves and slopes, having maximum amplitudes virtually independent of storm category. In most cases no detection was possible over deep oceanic regions, nor at distant arrays. Additionally, the rear quadrants and trailing swells of the cyclone provide the optimum SGW spectrum for the generation of microseisms, often shifted more than 500 km off the "eye". As a result of the aforementioned and added to the strong attenuation of storm microseisms, the inversion of tracks or physical properties of storms using a few far-field arrays is discontinuous in most cases, being reliable only if benchmark atmospheric and/or oceanic data is available for comparison. Even if challenging due to the complexity of the coupled phenomena responsible for microseisms, the inversion of site properties, such as bathymetric parameters (e.g. depth, seabed geomorphology), near- bottom geology ... |
format |
Conference Object |
author |
Pelaez, Julián Becker, Dirk Hadziioannou, Céline |
author_facet |
Pelaez, Julián Becker, Dirk Hadziioannou, Céline |
author_sort |
Pelaez, Julián |
title |
The seismological signature of cyclonic storms through the ears of a sensor array |
title_short |
The seismological signature of cyclonic storms through the ears of a sensor array |
title_full |
The seismological signature of cyclonic storms through the ears of a sensor array |
title_fullStr |
The seismological signature of cyclonic storms through the ears of a sensor array |
title_full_unstemmed |
The seismological signature of cyclonic storms through the ears of a sensor array |
title_sort |
seismological signature of cyclonic storms through the ears of a sensor array |
publishDate |
2021 |
url |
https://doi.org/10.23689/fidgeo-4000 http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/8340 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
81. Jahrestagung der Deutschen Geophysikalischen Gesellschaft, 1-5.03.2021 Kiel, Germany. doi:10.23689/fidgeo-4000 http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/8340 |
op_rights |
CC BY 4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.23689/fidgeo-4000 |
_version_ |
1766135290875871232 |