Tsunami-generated magnetic fields have primary and secondary arrivals like seismic waves

Abstract A seafloor geomagnetic observatory in the northwest Pacific has provided very long vector geomagnetic time-series. It was found that the time-series include significant magnetic signals generated by a few giant tsunami events including the 2011 Tohoku Tsunami. Here we report that the tsunam...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Takuto Minami, Neesha R. Schnepf, Hiroaki Toh
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/3d6f76e2369e4f49b3056805f22e0c34
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:3d6f76e2369e4f49b3056805f22e0c34
record_format	dspace
spelling	oai:doaj.org-article:3d6f76e2369e4f49b3056805f22e0c342021-12-02T14:16:26ZTsunami-generated magnetic fields have primary and secondary arrivals like seismic waves10.1038/s41598-021-81820-52045-2322https://doaj.org/article/3d6f76e2369e4f49b3056805f22e0c342021-01-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-81820-5https://doaj.org/toc/2045-2322Abstract A seafloor geomagnetic observatory in the northwest Pacific has provided very long vector geomagnetic time-series. It was found that the time-series include significant magnetic signals generated by a few giant tsunami events including the 2011 Tohoku Tsunami. Here we report that the tsunami-generated magnetic fields consist of the weak but first arriving field, and the strong but second arriving field—similar to the P- and S-waves in seismology. The latter field is a result of coupling between horizontal particle motions of the conductive seawater and the vertical component of the background geomagnetic main field, which have been studied well so far. On the other hand, the former field stems from coupling between vertical particle motions and the horizontal component of the geomagnetic main field parallel to tsunami propagation direction. The former field has been paid less attention because horizontal particle motions are dominant in the Earth’s oceans. It, however, was shown that not only the latter but also the former field is significant especially around the magnetic equator where the vertical component of the background magnetic field vanishes. This implies that global tsunami early warning using tsunami-generated magnetic fields is possible even in the absence of the background vertical geomagnetic component.Takuto MinamiNeesha R. SchnepfHiroaki TohNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-8 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Takuto Minami Neesha R. Schnepf Hiroaki Toh Tsunami-generated magnetic fields have primary and secondary arrivals like seismic waves
description	Abstract A seafloor geomagnetic observatory in the northwest Pacific has provided very long vector geomagnetic time-series. It was found that the time-series include significant magnetic signals generated by a few giant tsunami events including the 2011 Tohoku Tsunami. Here we report that the tsunami-generated magnetic fields consist of the weak but first arriving field, and the strong but second arriving field—similar to the P- and S-waves in seismology. The latter field is a result of coupling between horizontal particle motions of the conductive seawater and the vertical component of the background geomagnetic main field, which have been studied well so far. On the other hand, the former field stems from coupling between vertical particle motions and the horizontal component of the geomagnetic main field parallel to tsunami propagation direction. The former field has been paid less attention because horizontal particle motions are dominant in the Earth’s oceans. It, however, was shown that not only the latter but also the former field is significant especially around the magnetic equator where the vertical component of the background magnetic field vanishes. This implies that global tsunami early warning using tsunami-generated magnetic fields is possible even in the absence of the background vertical geomagnetic component.
format	article
author	Takuto Minami Neesha R. Schnepf Hiroaki Toh
author_facet	Takuto Minami Neesha R. Schnepf Hiroaki Toh
author_sort	Takuto Minami
title	Tsunami-generated magnetic fields have primary and secondary arrivals like seismic waves
title_short	Tsunami-generated magnetic fields have primary and secondary arrivals like seismic waves
title_full	Tsunami-generated magnetic fields have primary and secondary arrivals like seismic waves
title_fullStr	Tsunami-generated magnetic fields have primary and secondary arrivals like seismic waves
title_full_unstemmed	Tsunami-generated magnetic fields have primary and secondary arrivals like seismic waves
title_sort	tsunami-generated magnetic fields have primary and secondary arrivals like seismic waves
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/3d6f76e2369e4f49b3056805f22e0c34
work_keys_str_mv	AT takutominami tsunamigeneratedmagneticfieldshaveprimaryandsecondaryarrivalslikeseismicwaves AT neesharschnepf tsunamigeneratedmagneticfieldshaveprimaryandsecondaryarrivalslikeseismicwaves AT hiroakitoh tsunamigeneratedmagneticfieldshaveprimaryandsecondaryarrivalslikeseismicwaves
_version_	1718391661429522432

Tsunami-generated magnetic fields have primary and secondary arrivals like seismic waves

Ejemplares similares