中文版 | English
Title

S-wave modelling of the Showa-Shinzan lava dome in Usu Volcano, Northern Japan, from seismic observations

Author
Corresponding AuthorTakeo,Akiko; Takeo,Akiko
Publication Years
2022-09-01
DOI
Source Title
ISSN
0956-540X
EISSN
1365-246X
Volume230Issue:3Pages:1662-1678
Abstract

To obtain an internal S-wave velocity structure, we conducted a passive seismic campaign with 21 1-Hz seismometers on and around the Showa-Shinzan lava dome, which emerged during the 1943-1945 eruption of Usu Volcano, Japan. Before the campaign, we calibrated seismometers and found slight phase-response differences between seismometers of less than 1-2°. After the campaign, we extracted seismic wavefield by taking cross-correlations of vertical-component ambient noise records between seismic sites. We developed a new method to measure phase velocities of the Rayleigh wave automatically by assuming layered structure and finally obtained 1-D S-wave velocity models in summit, roof and base regions. The obtained S-wave velocity right beneath the intruded lava dome is higher than that in surrounding areas by a few tens of per cent down to a few hundred metres below sea level, indicating narrow but deep existence of the root of the lava dome. The obtained S-wave velocity at depths shallower than ∼50 m inside the lava dome in the summit area was ∼1 km s-1, significantly lower than that predicted from the density of 2.3 × 103 kg m-3 estimated in previous muon-radiography studies and a conventional scaling, indicating the effect of cracking in the lava dome.

Keywords
URL[Source Record]
Indexed By
SCI ; EI
Language
English
SUSTech Authorship
Others
WOS Accession No
WOS:000797638800001
EI Accession Number
20222612273131
EI Keywords
Acoustic Wave Velocity ; Domes ; Roofs ; Sea Level ; Seismology ; Shear Waves ; Surface Waves ; Volcanoes
ESI Classification Code
Structural Members And Shapes:408.2 ; Oceanography, General:471.1 ; Seismology:484 ; Earthquake Measurements And Analysis:484.1 ; Acoustic Waves:751.1 ; Mechanics:931.1
ESI Research Field
GEOSCIENCES
Scopus EID
2-s2.0-85132791621
Data Source
Scopus
Citation statistics
Cited Times [WOS]:2
Document TypeJournal Article
Identifierhttp://kc.sustech.edu.cn/handle/2SGJ60CL/352471
DepartmentDepartment of Earth and Space Sciences
Affiliation
1.Earthquake Research Institute,The University of Tokyo,Tokyo,1130032,Japan
2.Institute of Seismology and Volcanology,Faculty of Science,Hokkaido University,Hokkaido,0600810,Japan
3.Graduate School of Science and Technology,Hirosaki University,Aomori,0368561,Japan
4.Department of Earth and Space Sciences,Southern University of Science and Technology,Shenzhen,518055,China
5.Tokyo Metropolitan Government Bureau of Construction,Tokyo,Japan
6.JX Nippon Oil & Gas Exploration Corp,Tokyo,Japan
7.Kobe University,Hyogo,Japan
8.Earthquake Research Institute,The University of Tokyo,Tokyo,1130032,Japan
9.Institute of Seismology and Volcanology,Faculty of Science,Hokkaido University,Hokkaido,0600810,Japan
10.Graduate School of Science and Technology,Hirosaki University,Aomori,0368561,Japan
11.Department of Earth and Space Sciences,Southern University of Science and Technology,Shenzhen,518055,China
12.Tokyo Metropolitan Government Bureau of Construction,Tokyo,Japan
13.JX Nippon Oil & Gas Exploration Corp,Tokyo,Japan
14.Kobe University,Hyogo,Japan
Recommended Citation
GB/T 7714
Takeo,Akiko,Nishida,Kiwamu,Aoyama,Hiroshi,et al. S-wave modelling of the Showa-Shinzan lava dome in Usu Volcano, Northern Japan, from seismic observations[J]. GEOPHYSICAL JOURNAL INTERNATIONAL,2022,230(3):1662-1678.
APA
Takeo,Akiko.,Nishida,Kiwamu.,Aoyama,Hiroshi.,Ishise,Motoko.,Kai,Takeru.,...&Aoki,Yosuke.(2022).S-wave modelling of the Showa-Shinzan lava dome in Usu Volcano, Northern Japan, from seismic observations.GEOPHYSICAL JOURNAL INTERNATIONAL,230(3),1662-1678.
MLA
Takeo,Akiko,et al."S-wave modelling of the Showa-Shinzan lava dome in Usu Volcano, Northern Japan, from seismic observations".GEOPHYSICAL JOURNAL INTERNATIONAL 230.3(2022):1662-1678.
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