Picking first arrivals in hydroacoustic seismograms from MERMAID floats
Floating seismometers (‘MERMAIDs’) operating in the noisy environment of the world’s oceans pose a challenge for picking the time of earthquake first arrivals. We report on an experiment to estimate the errors in picked arrivals from 49 MERMAIDS operating in the South Pacific, using two independent...
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| Format: | Article |
| Language: | English |
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McGill University
2025-04-01
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| Series: | Seismica |
| Online Access: | https://seismica.library.mcgill.ca/article/view/1505 |
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| author | Guust Nolet Nguyen Ba Hoang Sébastien Bonnieux Yuko Kondo Fanchao Kong Masayuki Obayashi Sirawich Pipatprathanporn Karin Sigloch Joel D. Simon Frederik J. Simons Hiroko Sogioka Junko Yoshimitsu Qinling Zhang |
| author_facet | Guust Nolet Nguyen Ba Hoang Sébastien Bonnieux Yuko Kondo Fanchao Kong Masayuki Obayashi Sirawich Pipatprathanporn Karin Sigloch Joel D. Simon Frederik J. Simons Hiroko Sogioka Junko Yoshimitsu Qinling Zhang |
| author_sort | Guust Nolet |
| collection | DOAJ |
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Floating seismometers (‘MERMAIDs’) operating in the noisy environment of the world’s oceans pose a challenge for picking the time of earthquake first arrivals. We report on an experiment to estimate the errors in picked arrivals from 49 MERMAIDS operating in the South Pacific, using two independent strategies. For 15 events, the same arrivals were redundandly picked by several analysts, allowing for a direct estimate of error distributions. Standard errors in times from MERMAID seismograms vary from 0.2 s for close events at mantle depths in the Kermadec subduction zone to more than 2 s for crustal events at large epicentral distance. In a second experiment we analysed the a posteriori misfits after tomographically inverting all events. The residual traveltime misfit is consistent with the error estimates from the first experiment, but also shows inconsistencies with arrival times from the ISC-EHB and NEIC catalogues, which we attribute to errors in the published hypocentres and/or origin times.
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| format | Article |
| id | doaj-art-d75ebb1caf1c4cc786e582fdd18ef0f4 |
| institution | OA Journals |
| issn | 2816-9387 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | McGill University |
| record_format | Article |
| series | Seismica |
| spelling | doaj-art-d75ebb1caf1c4cc786e582fdd18ef0f42025-08-20T02:18:46ZengMcGill UniversitySeismica2816-93872025-04-014110.26443/seismica.v4i1.1505Picking first arrivals in hydroacoustic seismograms from MERMAID floatsGuust Nolet0Nguyen Ba Hoang1Sébastien Bonnieux2Yuko Kondo3Fanchao Kong4Masayuki Obayashi5Sirawich Pipatprathanporn6Karin Sigloch7Joel D. Simon8Frederik J. Simons9Hiroko Sogioka10Junko Yoshimitsu11Qinling Zhang12Université Côte d'AzurUniversity of Science and Technology, Danang, VietnamUniversité Côte d'AzurKobe UniversitySUSTechResearch Institute for Marine Geodynamics, JAMSTECPrincetonCNRSDepartment of Geosciences, Princeton UniversityDepartment of Geosciences, Princeton UniversityKobe University, Kobe, JapanResearch Institute for Marine Geodynamics, JAMSTECSUSTech Floating seismometers (‘MERMAIDs’) operating in the noisy environment of the world’s oceans pose a challenge for picking the time of earthquake first arrivals. We report on an experiment to estimate the errors in picked arrivals from 49 MERMAIDS operating in the South Pacific, using two independent strategies. For 15 events, the same arrivals were redundandly picked by several analysts, allowing for a direct estimate of error distributions. Standard errors in times from MERMAID seismograms vary from 0.2 s for close events at mantle depths in the Kermadec subduction zone to more than 2 s for crustal events at large epicentral distance. In a second experiment we analysed the a posteriori misfits after tomographically inverting all events. The residual traveltime misfit is consistent with the error estimates from the first experiment, but also shows inconsistencies with arrival times from the ISC-EHB and NEIC catalogues, which we attribute to errors in the published hypocentres and/or origin times. https://seismica.library.mcgill.ca/article/view/1505 |
| spellingShingle | Guust Nolet Nguyen Ba Hoang Sébastien Bonnieux Yuko Kondo Fanchao Kong Masayuki Obayashi Sirawich Pipatprathanporn Karin Sigloch Joel D. Simon Frederik J. Simons Hiroko Sogioka Junko Yoshimitsu Qinling Zhang Picking first arrivals in hydroacoustic seismograms from MERMAID floats Seismica |
| title | Picking first arrivals in hydroacoustic seismograms from MERMAID floats |
| title_full | Picking first arrivals in hydroacoustic seismograms from MERMAID floats |
| title_fullStr | Picking first arrivals in hydroacoustic seismograms from MERMAID floats |
| title_full_unstemmed | Picking first arrivals in hydroacoustic seismograms from MERMAID floats |
| title_short | Picking first arrivals in hydroacoustic seismograms from MERMAID floats |
| title_sort | picking first arrivals in hydroacoustic seismograms from mermaid floats |
| url | https://seismica.library.mcgill.ca/article/view/1505 |
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