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{"_buckets": {"deposit": "511c9ad0-b0e8-4ad1-9cea-6e57dba54427"}, "_deposit": {"id": "4425", "owners": [1], "pid": {"revision_id": 0, "type": "depid", "value": "4425"}, "status": "published"}, "_oai": {"id": "oai:nied-repo.bosai.go.jp:00004425", "sets": []}, "author_link": [], "item_10001_biblio_info_7": {"attribute_name": "書誌情報", "attribute_value_mlt": [{"bibliographicIssueDates": {"bibliographicIssueDate": "2001-01"}, "bibliographicIssueNumber": "1-2", "bibliographicPageEnd": "182", "bibliographicPageStart": "163", "bibliographicVolumeNumber": "105", "bibliographic_titles": [{"bibliographic_title": "Journal of Volcanology and Geothermal Research", "bibliographic_titleLang": "en"}]}]}, "item_10001_description_5": {"attribute_name": "抄録", "attribute_value_mlt": [{"subitem_description": "N-type earthquakes sometimes occur before the eruption of andesitic volcanoes, but their source mechanism has not been understood well. Their waveforms have stationary periods and decay slowly resembling to damped oscillation. They have common characteristics of spectra among the different stations\n these spectral peaks appear at almost equal intervals of 1.0 Hz with common sharpness. We made detailed analysis on the N-type earthquakes observed at Asama volcano in July 1995. During 10 days activity, the duration of each earthquake increased gradually from 40 s to 3 min, while the peak frequency decreased from 2.7 to 0.8 Hz. Hypocenters are distributed slightly west under the summit crater with 0.4-1.7 km above sea-level. Source mechanism of the N-type earthquake is determined using a waveform inversion technique. Synthetic waveforms are calculated using 2D finite difference method. Surface topography is included in the calculation to incorporate the case that the source region is higher than the stations. Since the optimum solution has a large volumetric component, we approximated the volumetric part as a volume change of fluid filled sphere or cylinder or plane crack, and decomposed the solution into volumetric and non-volumetric part. Consequently, it is revealed that the optimum solution can be expressed as \"crack expansion (contraction) + small fault slip\", because the spectral peak distribution advocates the crack expansion model among these three candidates. The frequency change during this activity may be explained by the time variation of the sound speed of inner fluid from 300 to 100 m/s. The change of the void fraction of water-steam phase might have caused the decrease of the sound speed. © 2001 Elsevier Science B.V. All rights reserved.", "subitem_description_language": "en", "subitem_description_type": "Other"}]}, "item_10001_relation_14": {"attribute_name": "DOI", "attribute_value_mlt": [{"subitem_relation_type_id": {"subitem_relation_type_id_text": "10.1016/S0377-0273(00)00223-7"}}]}, "item_10001_source_id_9": {"attribute_name": "ISSN", "attribute_value_mlt": [{"subitem_source_identifier": "0377-0273", "subitem_source_identifier_type": "ISSN"}]}, "item_creator": {"attribute_name": "著者", "attribute_type": "creator", "attribute_value_mlt": [{"creatorNames": [{"creatorName": "H. Aoyama", "creatorNameLang": "en"}]}, {"creatorNames": [{"creatorName": "M. Takeo", "creatorNameLang": "en"}]}]}, "item_language": {"attribute_name": "言語", "attribute_value_mlt": [{"subitem_language": "eng"}]}, "item_title": "Wave properties and focal mechanisms of N-type earthquakes at Asama volcano", "item_titles": {"attribute_name": "タイトル", "attribute_value_mlt": [{"subitem_title": "Wave properties and focal mechanisms of N-type earthquakes at Asama volcano", "subitem_title_language": "en"}]}, "item_type_id": "40001", "owner": "1", "path": ["1670839190650"], "permalink_uri": "https://nied-repo.bosai.go.jp/records/4425", "pubdate": {"attribute_name": "PubDate", "attribute_value": "2023-03-30"}, "publish_date": "2023-03-30", "publish_status": "0", "recid": "4425", "relation": {}, "relation_version_is_last": true, "title": ["Wave properties and focal mechanisms of N-type earthquakes at Asama volcano"], "weko_shared_id": -1}
  1. 防災科研関係論文

Wave properties and focal mechanisms of N-type earthquakes at Asama volcano

https://nied-repo.bosai.go.jp/records/4425
https://nied-repo.bosai.go.jp/records/4425
10bdc72d-7df3-4504-8637-d22cbafdc4ae
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル Wave properties and focal mechanisms of N-type earthquakes at Asama volcano
言語
言語 eng
著者 H. Aoyama

× H. Aoyama

en H. Aoyama

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M. Takeo

× M. Takeo

en M. Takeo

Search repository
抄録
内容記述タイプ Other
内容記述 N-type earthquakes sometimes occur before the eruption of andesitic volcanoes, but their source mechanism has not been understood well. Their waveforms have stationary periods and decay slowly resembling to damped oscillation. They have common characteristics of spectra among the different stations
these spectral peaks appear at almost equal intervals of 1.0 Hz with common sharpness. We made detailed analysis on the N-type earthquakes observed at Asama volcano in July 1995. During 10 days activity, the duration of each earthquake increased gradually from 40 s to 3 min, while the peak frequency decreased from 2.7 to 0.8 Hz. Hypocenters are distributed slightly west under the summit crater with 0.4-1.7 km above sea-level. Source mechanism of the N-type earthquake is determined using a waveform inversion technique. Synthetic waveforms are calculated using 2D finite difference method. Surface topography is included in the calculation to incorporate the case that the source region is higher than the stations. Since the optimum solution has a large volumetric component, we approximated the volumetric part as a volume change of fluid filled sphere or cylinder or plane crack, and decomposed the solution into volumetric and non-volumetric part. Consequently, it is revealed that the optimum solution can be expressed as "crack expansion (contraction) + small fault slip", because the spectral peak distribution advocates the crack expansion model among these three candidates. The frequency change during this activity may be explained by the time variation of the sound speed of inner fluid from 300 to 100 m/s. The change of the void fraction of water-steam phase might have caused the decrease of the sound speed. © 2001 Elsevier Science B.V. All rights reserved.
言語 en
書誌情報 en : Journal of Volcanology and Geothermal Research

巻 105, 号 1-2, p. 163-182
ISSN
収録物識別子タイプ ISSN
収録物識別子 0377-0273
DOI
関連識別子 10.1016/S0377-0273(00)00223-7
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