WEKO3
アイテム
1973年浅間火山噴火に伴う爆発地震について : (第1報)スペクトル解析
https://doi.org/10.15083/0000033119
https://doi.org/10.15083/0000033119c367376c-d314-4d14-90f5-3968ec1d8267
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
ji0541008.pdf (1.4 MB)
|
|
| Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2008-05-30 | |||||
| タイトル | ||||||
| タイトル | 1973年浅間火山噴火に伴う爆発地震について : (第1報)スペクトル解析 | |||||
| 言語 | ja | |||||
| 言語 | ||||||
| 言語 | jpn | |||||
| 資源タイプ | ||||||
| 資源 | http://purl.org/coar/resource_type/c_6501 | |||||
| タイプ | departmental bulletin paper | |||||
| ID登録 | ||||||
| ID登録 | 10.15083/0000033119 | |||||
| ID登録タイプ | JaLC | |||||
| その他のタイトル | ||||||
| その他のタイトル | Explosion Earthquakes Associated with the 1973 Eruptions of Asama Volcano : (Part I) Spectral Studies | |||||
| 著者 |
今井, 博
× 今井, 博× 行田, 紀也× 小山, 悦郎 |
|||||
| 著者別名 | ||||||
| 識別子Scheme | WEKO | |||||
| 識別子 | 129164 | |||||
| 姓名 | Imai, Hiroshi | |||||
| 著者別名 | ||||||
| 識別子Scheme | WEKO | |||||
| 識別子 | 129165 | |||||
| 姓名 | Gyoda, Noriya | |||||
| 著者別名 | ||||||
| 識別子Scheme | WEKO | |||||
| 識別子 | 129166 | |||||
| 姓名 | Koyama, Etsuro | |||||
| 著者所属 | ||||||
| 著者所属 | 地震研究所 | |||||
| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Asama Volcano, located in the central part of Honshu, commenced an eruption at the summit crater on Feb. 1 in 1973 after 11 years'quiescence and a series of explosive eruptions continued until April 26 of the same year. The data of three component seismograms analysed in this paper were recorded by long-period seismographs (T0 = 5.0 sec) at the seismic station NAKANOSAWA located 4.2 km east of the summit crater and were registered on smoked paper recording drums at the Asama Volcano Observatory. Power spectral analyses were carried out separately, by use of the Maximum Entropy method and the Fast Fourier Transform method for both the initial parts and the later parts, of the explosion earthquakes that exceeded 1015 ergs in seismic energy. The results of the spectral studies are as follows: 1) As to the initial parts (5 sec from on-set) of seismic waves, N-S components prevail in longer periods against E-W components. 2) As to the later parts (51.2 sec after 10 sec from on-set), the results are contrary to 1). Moreover, E-W components of Feb. 1 and Mar. 10 resemble each other. The other components (U-D, N-S), however, are different from each other. Particularly, it should be emphasized that the maximum value of the spectrum for the U-D component is found at about 0.2 Hz on Feb. 1 but at about 0.7-1.3 Hz on Mar. 10. 3) Sweep maximum amplitudes (or running diagrams) for E-W components have splittings at about 1.4-1.6 sec. 4) Predominant periods of the initial part of seismic waves on running diagrams change and/or separate into other periods. As the results of these analyses, it is recognized that the explosion earthquake on Feb. 1 is different from others on the mechanism, particularly, from that on Mar. 10. In addition, it is characteristic that the spectra of the later parts for E-W components, which are in a radial direction from the summit crater, are stable in shape. It is obvious that these results give some clue to the knowledge of the mechanism of explosion earthquakes, and of eruptions. | |||||
| 書誌情報 |
東京大學地震研究所彙報 = Bulletin of the Earthquake Research Institute, University of Tokyo 巻 54, 号 1, p. 161-186, 発行日 1979-11-30 |
|||||
| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 00408972 | |||||
| 書誌レコードID | ||||||
| 収録物識別子タイプ | NCID | |||||
| 収録物識別子 | AN00162258 | |||||
| フォーマット | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | application/pdf | |||||
| 日本十進分類法 | ||||||
| 主題Scheme | NDC | |||||
| 主題 | 453 | |||||
| 出版者 | ||||||
| 出版者 | 東京大学地震研究所 | |||||
| 出版者別名 | ||||||
| Earthquake Research Institute, University of Tokyo | ||||||
