Scattering strength at active volcanoes in Japan as inferred from the peak ratio analysis of teleseismic P waves

Abstract Small-scale seismic velocity heterogeneity has been studied through the calculation of peak amplitude ratio as a means to quantify the strength of seismic wave scattering at volcanoes in Japan. This ratio is defined as the ratio of the maximum (peak) P wave energy in the transverse componen...

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Autores principales:	Gugi Ganefianto, Hisashi Nakahara, Takeshi Nishimura
Formato:	article
Lenguaje:	EN
Publicado:	SpringerOpen 2021
Materias:	Heterogeneity Seismic scattering Volcanoes JMA seismometers Hi-net Geography. Anthropology. Recreation G Geodesy QB275-343 Geology QE1-996.5
Acceso en línea:	https://doaj.org/article/573d85a04bad412da04a9190cddf7e46
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spelling	oai:doaj.org-article:573d85a04bad412da04a9190cddf7e462021-11-28T12:27:55ZScattering strength at active volcanoes in Japan as inferred from the peak ratio analysis of teleseismic P waves10.1186/s40623-021-01541-x1880-5981https://doaj.org/article/573d85a04bad412da04a9190cddf7e462021-11-01T00:00:00Zhttps://doi.org/10.1186/s40623-021-01541-xhttps://doaj.org/toc/1880-5981Abstract Small-scale seismic velocity heterogeneity has been studied through the calculation of peak amplitude ratio as a means to quantify the strength of seismic wave scattering at volcanoes in Japan. This ratio is defined as the ratio of the maximum (peak) P wave energy in the transverse component seismogram envelope over that of the three-component sum seismogram envelope (transverse + radial + vertical). According to the previous study using Japan’s Hi-net seismometer network, the peak ratio is observed to be larger near the (active) quaternary volcanoes. However, these Hi-net stations are not positioned on the volcanoes themselves. This study systematically examines the peak ratios at 47 active volcanoes across Japan, using seismometers operated by the Japan Meteorological Agency (JMA). Analyses were performed at four frequency bands: 0.5–1, 1–2, 2–4, and 4–8 Hz. We found that the JMA stations yield higher peak ratios than the Hi-net stations. Their differences are statistically significant at the 99.9% confidence level in all frequency bands. We also examined the differences between the ground surface and borehole stations of the JMA network. The former shows larger peak ratios, and for most frequency bands, the differences are also statistically significant at the 99.9% confidence level. This suggests an intensification of small-scale medium heterogeneities especially at shallow depths at active volcanoes, and that scattering might have been enhanced at the very shallow parts. Graphical AbstractGugi GanefiantoHisashi NakaharaTakeshi NishimuraSpringerOpenarticleHeterogeneitySeismic scatteringVolcanoesJMA seismometersHi-netGeography. Anthropology. RecreationGGeodesyQB275-343GeologyQE1-996.5ENEarth, Planets and Space, Vol 73, Iss 1, Pp 1-10 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Heterogeneity Seismic scattering Volcanoes JMA seismometers Hi-net Geography. Anthropology. Recreation G Geodesy QB275-343 Geology QE1-996.5
spellingShingle	Heterogeneity Seismic scattering Volcanoes JMA seismometers Hi-net Geography. Anthropology. Recreation G Geodesy QB275-343 Geology QE1-996.5 Gugi Ganefianto Hisashi Nakahara Takeshi Nishimura Scattering strength at active volcanoes in Japan as inferred from the peak ratio analysis of teleseismic P waves
description	Abstract Small-scale seismic velocity heterogeneity has been studied through the calculation of peak amplitude ratio as a means to quantify the strength of seismic wave scattering at volcanoes in Japan. This ratio is defined as the ratio of the maximum (peak) P wave energy in the transverse component seismogram envelope over that of the three-component sum seismogram envelope (transverse + radial + vertical). According to the previous study using Japan’s Hi-net seismometer network, the peak ratio is observed to be larger near the (active) quaternary volcanoes. However, these Hi-net stations are not positioned on the volcanoes themselves. This study systematically examines the peak ratios at 47 active volcanoes across Japan, using seismometers operated by the Japan Meteorological Agency (JMA). Analyses were performed at four frequency bands: 0.5–1, 1–2, 2–4, and 4–8 Hz. We found that the JMA stations yield higher peak ratios than the Hi-net stations. Their differences are statistically significant at the 99.9% confidence level in all frequency bands. We also examined the differences between the ground surface and borehole stations of the JMA network. The former shows larger peak ratios, and for most frequency bands, the differences are also statistically significant at the 99.9% confidence level. This suggests an intensification of small-scale medium heterogeneities especially at shallow depths at active volcanoes, and that scattering might have been enhanced at the very shallow parts. Graphical Abstract
format	article
author	Gugi Ganefianto Hisashi Nakahara Takeshi Nishimura
author_facet	Gugi Ganefianto Hisashi Nakahara Takeshi Nishimura
author_sort	Gugi Ganefianto
title	Scattering strength at active volcanoes in Japan as inferred from the peak ratio analysis of teleseismic P waves
title_short	Scattering strength at active volcanoes in Japan as inferred from the peak ratio analysis of teleseismic P waves
title_full	Scattering strength at active volcanoes in Japan as inferred from the peak ratio analysis of teleseismic P waves
title_fullStr	Scattering strength at active volcanoes in Japan as inferred from the peak ratio analysis of teleseismic P waves
title_full_unstemmed	Scattering strength at active volcanoes in Japan as inferred from the peak ratio analysis of teleseismic P waves
title_sort	scattering strength at active volcanoes in japan as inferred from the peak ratio analysis of teleseismic p waves
publisher	SpringerOpen
publishDate	2021
url	https://doaj.org/article/573d85a04bad412da04a9190cddf7e46
work_keys_str_mv	AT gugiganefianto scatteringstrengthatactivevolcanoesinjapanasinferredfromthepeakratioanalysisofteleseismicpwaves AT hisashinakahara scatteringstrengthatactivevolcanoesinjapanasinferredfromthepeakratioanalysisofteleseismicpwaves AT takeshinishimura scatteringstrengthatactivevolcanoesinjapanasinferredfromthepeakratioanalysisofteleseismicpwaves
_version_	1718407953092968448

Scattering strength at active volcanoes in Japan as inferred from the peak ratio analysis of teleseismic P waves

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