QuakeMigrate: a Modular, Open-Source Python Package for Automatic Earthquake Detection and Location
Detecting and locating microearthquakes from continuous waveform records is the fundamental step in microseismic processing. Dense local networks and arrays have introduced the possibility to detect large numbers of far weaker events, but when viewed on seismic records from individual stations their...
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ftunivcam:oai:www.repository.cam.ac.uk:1810/335653 2024-01-21T10:01:02+01:00 QuakeMigrate: a Modular, Open-Source Python Package for Automatic Earthquake Detection and Location Winder, Tom Bacon, Conor Smith, Jonathan Hudson, Thomas Greenfield, Tim White, Robert 2022-03-16T17:16:20Z application/pdf https://www.repository.cam.ac.uk/handle/1810/335653 https://doi.org/10.17863/CAM.83083 eng eng Department of Earth Sciences https://www.repository.cam.ac.uk/handle/1810/335653 doi:10.17863/CAM.83083 Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/ earthquake detection earthquake location seismology volcano seismology icequakes open source software Presentation 2022 ftunivcam https://doi.org/10.17863/CAM.83083 2023-12-28T23:22:31Z Detecting and locating microearthquakes from continuous waveform records is the fundamental step in microseismic processing. Dense local networks and arrays have introduced the possibility to detect large numbers of far weaker events, but when viewed on seismic records from individual stations their waveforms are often obscured by noise. Furthermore, areas of interest for microseismic monitoring often feature extremely high event rates, highlighting the limitations of traditional techniques based on phase picking and association. In order to maximise the new insights gained, we require fully automated techniques which can exploit modern recordings to produce highly complete earthquake catalogues containing few artefacts. QuakeMigrate is a new modular, open-source Python package providing a framework to efficiently, automatically and robustly detect and locate microseismicity. The user inputs continuous seismic data, a velocity model or pre-calculated look-up table and list of station locations. Instead of reducing the raw waveforms to discrete time picks, they are transformed (by amplitude, frequency and/or polarisation analysis) to continuous functions representing the probability of a particular phase arrival through time. These ‘onset functions’ from stations across the network are then migrated according to a travel-time look-up table and stacked to perform a grid-search for coherent sources of energy in the subsurface. This enables detection of earthquakes at close to or below the signal-to-noise ratio at individual stations, and implicitly associates phase arrivals even at very small inter-event times. We demonstrate the flexibility and power of this approach with examples of basal icequakes detected at the Rutford Ice Stream, Antarctica, dike- and caldera-collapse induced seismicity at Bárðarbunga central volcano, Iceland, and the aftershock sequence from a M5 earthquake at Mt. Kinabalu, northern Borneo. The modular nature of the workflow and wide range of automatic plotting options makes parameter choice ... Conference Object Antarc* Antarctica Iceland Rutford Ice Stream Apollo - University of Cambridge Repository Rutford ENVELOPE(-85.300,-85.300,-78.600,-78.600) Rutford Ice Stream ENVELOPE(-80.000,-80.000,-79.167,-79.167) |
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Open Polar |
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Apollo - University of Cambridge Repository |
op_collection_id |
ftunivcam |
language |
English |
topic |
earthquake detection earthquake location seismology volcano seismology icequakes open source software |
spellingShingle |
earthquake detection earthquake location seismology volcano seismology icequakes open source software Winder, Tom Bacon, Conor Smith, Jonathan Hudson, Thomas Greenfield, Tim White, Robert QuakeMigrate: a Modular, Open-Source Python Package for Automatic Earthquake Detection and Location |
topic_facet |
earthquake detection earthquake location seismology volcano seismology icequakes open source software |
description |
Detecting and locating microearthquakes from continuous waveform records is the fundamental step in microseismic processing. Dense local networks and arrays have introduced the possibility to detect large numbers of far weaker events, but when viewed on seismic records from individual stations their waveforms are often obscured by noise. Furthermore, areas of interest for microseismic monitoring often feature extremely high event rates, highlighting the limitations of traditional techniques based on phase picking and association. In order to maximise the new insights gained, we require fully automated techniques which can exploit modern recordings to produce highly complete earthquake catalogues containing few artefacts. QuakeMigrate is a new modular, open-source Python package providing a framework to efficiently, automatically and robustly detect and locate microseismicity. The user inputs continuous seismic data, a velocity model or pre-calculated look-up table and list of station locations. Instead of reducing the raw waveforms to discrete time picks, they are transformed (by amplitude, frequency and/or polarisation analysis) to continuous functions representing the probability of a particular phase arrival through time. These ‘onset functions’ from stations across the network are then migrated according to a travel-time look-up table and stacked to perform a grid-search for coherent sources of energy in the subsurface. This enables detection of earthquakes at close to or below the signal-to-noise ratio at individual stations, and implicitly associates phase arrivals even at very small inter-event times. We demonstrate the flexibility and power of this approach with examples of basal icequakes detected at the Rutford Ice Stream, Antarctica, dike- and caldera-collapse induced seismicity at Bárðarbunga central volcano, Iceland, and the aftershock sequence from a M5 earthquake at Mt. Kinabalu, northern Borneo. The modular nature of the workflow and wide range of automatic plotting options makes parameter choice ... |
format |
Conference Object |
author |
Winder, Tom Bacon, Conor Smith, Jonathan Hudson, Thomas Greenfield, Tim White, Robert |
author_facet |
Winder, Tom Bacon, Conor Smith, Jonathan Hudson, Thomas Greenfield, Tim White, Robert |
author_sort |
Winder, Tom |
title |
QuakeMigrate: a Modular, Open-Source Python Package for Automatic Earthquake Detection and Location |
title_short |
QuakeMigrate: a Modular, Open-Source Python Package for Automatic Earthquake Detection and Location |
title_full |
QuakeMigrate: a Modular, Open-Source Python Package for Automatic Earthquake Detection and Location |
title_fullStr |
QuakeMigrate: a Modular, Open-Source Python Package for Automatic Earthquake Detection and Location |
title_full_unstemmed |
QuakeMigrate: a Modular, Open-Source Python Package for Automatic Earthquake Detection and Location |
title_sort |
quakemigrate: a modular, open-source python package for automatic earthquake detection and location |
publisher |
Department of Earth Sciences |
publishDate |
2022 |
url |
https://www.repository.cam.ac.uk/handle/1810/335653 https://doi.org/10.17863/CAM.83083 |
long_lat |
ENVELOPE(-85.300,-85.300,-78.600,-78.600) ENVELOPE(-80.000,-80.000,-79.167,-79.167) |
geographic |
Rutford Rutford Ice Stream |
geographic_facet |
Rutford Rutford Ice Stream |
genre |
Antarc* Antarctica Iceland Rutford Ice Stream |
genre_facet |
Antarc* Antarctica Iceland Rutford Ice Stream |
op_relation |
https://www.repository.cam.ac.uk/handle/1810/335653 doi:10.17863/CAM.83083 |
op_rights |
Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.17863/CAM.83083 |
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1788690778069925888 |