Multi-phase seismic source imprint of tropical cyclones
| Autor: | Lucia Gualtieri, Lise Retailleau |
|---|---|
| Přispěvatelé: | Institut de Physique du Globe de Paris (IPGP), Institut national des sciences de l'Univers (INSU - CNRS)-IPG PARIS-Université de La Réunion (UR)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Observatoire Volcanologique du Piton de la Fournaise (OVPF), Institut de Physique du Globe de Paris, Stanford University |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Seismometer
Solid Earth sciences 010504 meteorology & atmospheric sciences Science Ambient noise level General Physics and Astronomy Sea state 010502 geochemistry & geophysics 01 natural sciences Article General Biochemistry Genetics and Molecular Biology Physics::Geophysics Wind wave 14. Life underwater Seismology Physics::Atmospheric and Oceanic Physics 0105 earth and related environmental sciences Multidisciplinary Microseism General Chemistry 13. Climate action [SDU]Sciences of the Universe [physics] Typhoon Reflection (physics) Tropical cyclone Geology |
| Zdroj: | Nature Communications Nature Communications, Nature Publishing Group, 2021, 12 (1), ⟨10.1038/s41467-021-22231-y⟩ Nature Communications, Vol 12, Iss 1, Pp 1-8 (2021) |
| ISSN: | 2041-1723 |
| DOI: | 10.1038/s41467-021-22231-y⟩ |
| Popis: | The coupling between the ocean activity driven by winds and the solid Earth generates seismic signals recorded by seismometers worldwide. The 2–10 s period band, known as secondary microseism, represents the largest background seismic wavefield. While moving over the ocean, tropical cyclones generate particularly strong and localized sources of secondary microseisms that are detected remotely by seismic arrays. We assess and compare the seismic sources of P, SV, and SH waves associated with typhoon Ioke (2006) during its extra-tropical transition. To understand their generation mechanisms, we compare the observed multi-phase sources with theoretical sources computed with a numerical ocean wave model, and we assess the influence of the ocean resonance (or ocean site effect) and coastal reflection of ocean waves. We show how the location and lateral extent of the associated seismic source is period- and phase-dependent. This information is crucial for the use of body waves for ambient noise imaging and gives insights about the sea state, complementary to satellite data. The authors locate the maximum seismic energy imprint and lateral extent of the seismic sources generated by Typhoon Ioke. Based on this data set, they present a new tool to shed light on the generation mechanism of secondary microseisms body waves. |
| Databáze: | OpenAIRE |
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