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A study of the seismic and volcanic activity of Mount Erebus, Antarctica, 1981-1982
https://nipr.repo.nii.ac.jp/records/1465
https://nipr.repo.nii.ac.jp/records/14657944aa29-2b24-4c47-990c-d29816e6d4ed
名前 / ファイル | ライセンス | アクション |
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KJ00000012098 (1.8 MB)
|
Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
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公開日 | 1983-10-01 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | A study of the seismic and volcanic activity of Mount Erebus, Antarctica, 1981-1982 | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | departmental bulletin paper | |||||
ページ属性 | ||||||
内容記述タイプ | Other | |||||
内容記述 | P(論文) | |||||
著者名(英) |
Shibuya, Kazuo
× Shibuya, Kazuo× Baba, Megumi× Kienle, Juergen× Dibble, Ray R.× Kyle, Philip R. |
|||||
著者所属(英) | ||||||
en | ||||||
National Institute of Polar Research/Department of Earth Science, Faculty of Science, Chiba University/Geophysical Institute, University of Alaska/Department of Geology, Victoria University/Department of Geoscience, New Mexico Institute of Mining and Technology | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | In order to monitor the long-term seismicity of Mount Erebus, Antarctica, seismic observations have been made since 1980 using radio-telemetered and local networks. The observations in the 1981-1982 field season enabled us to determine to hypocenters of 162 local events. The hypocenters can be grouped into two sets, group I with focal depths ranging from the elevation of the summit to sea level, and group II with depths ranging from sea level to 15km. The epicenters of group I earthquakes are concentrated 1 to 2.5km north-northeast of the summit crater, and have a nearly vertical focal depth distribution. They are accompanied by infrasonic signals of two distinct waveform types, which allowed the earthquakes to be classified into two sub-sets, called arbitrarily α-and β-type events. There are about twice as many α-type events than β-Type events. The epicenters of the deeper α-type events are more tightly clustered than those of the shallower β-type events. A comparison of the arrival times of the infrasonic signals with those of the seismic signals at the summit station indicates that infrasonic signals associated with α-type events may be shock waves traveling at a sound speed of around Mach 2. The shock waves may be generated at the surface of the lava lake that occupies an inner summit crater. The different character of α-and β-type infrasonic signals is probably the result of different partitioning of acoustic and seismic energies for the shallower β-type events and the somewhat deeper α-type events. The number of group Ii earthquakes is smaller by one order of magnitude compared to group I earthquakes. The hypocenters are scattered more widely and form an elongated pattern that is slightly inclined to a northeast. Group II earthquakes are not accompanied by infrasonic signals but are characterized by higher-frequency seismic signals at all stations. | |||||
雑誌書誌ID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA00733561 | |||||
書誌情報 |
Memoirs of National Institute of Polar Research. Special issue 巻 28, p. 54-66, 発行日 1983-10 |