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Title: インドネシア・スメル火山における小規模爆発に伴う地震およおび空気振動観測
Other Titles: Observation of Eruption Earthquakes and Air-shocks Accompanied with Small Explosive Eruptions at Semeru Volcano, East Jawa, Indonesia
Authors: 為栗, 健  kyouindb  KAKEN_id
井口, 正人  kyouindb  KAKEN_id
TRIASTUTY, Hetty
MULYANA, Iyan
HENDRASTO, Muhammad
WIRAKUSUMAH, Achmad Djumarma
Author's alias: TAMEGURI, Takeshi
IGUCHI, Masato
TRIASTUTY, Hetty
MULYANA, Iyan
HENDRASTO, Muhammad
WIRAKUSUMAH, Achmad Djumarma
Keywords: スメル火山
爆発的噴火
噴火地震
空気振動
Semeru volcano
explosive eruption
eruption earthquake
air-shock
Issue Date: 1-Apr-2003
Publisher: 京都大学防災研究所
Journal title: 京都大学防災研究所年報. B = Disaster Prevention Research Institute Annuals. B
Volume: 46
Issue: B
Start page: 779
End page: 786
Abstract: インドネシア・スメル火山において爆発的噴火に伴う爆発地震と空気振動の観測を行った。2002年9月14日~23日の観測期間中に872回の爆発的噴火が発生し,観測された爆発地震の地震波形の特徴,地震動と空気振動の関係を調べた。爆発地震の初動部分は押し波のP波,振幅の大きな引き波のP波に続き,初動の約1.5秒後にRayleigh波からなる1Hzの長周期振動が現れる。桜島火山においても同様な3つの位相が見られ,押し波のP波の特徴は桜島火山と類似している。引き波のP波に関しては,スメル火山においては上下動成分,桜島火山については水平動成分が卓越している。空気振動の振幅は地震動のRayleigh波の振幅と良い相関が見られた。観測された地震動および空気振動の振幅は桜島火山の振幅より1~2桁程度,諏訪之瀬島火山の振幅より1桁程度小さい。
Semeru volcano, an andesitic stratovolcano in East Java, Indonesia has continued eruptive activitywith frequent minor explosion at the summit crater. Seismic and infrasonic observations wereconducted at the volcano during the period from September 14-23, 2002. Eruption earthquakes andair-shocks were analyzed and compared with those of Sakurajima and Suwanosejima volcanoes.P-wave first motion is compression and is followed by a dilatational P-wave motion with largeramplitude. Rayleigh wave with longer period (Pulse width: 1.2 s) appear 1.5 s after the arrival of thefirst motion. The three phases are also observed at Sakurajima volcano. The characteristics ofcompressional P-wave first motion at Semeru volcano are similar to that of Sakurajima volcano.Radial component of a dilatational P-wave motion at Sakurajima volcano is dominant. In contrast, vertical component is dominant at Semeru volcano. Pulse width of Rayleigh wave at Semeru volcanois shorter than that of Sakurajima volcano. Amplitudes of Rayleigh waves correlate with theamplitudes of the air-shock. The amplitudes of the Rayleigh wave and air-shock at Semeru volcanoare 1-2 orders smaller than those of Sakurajima volcano and 1 order smaller than that ofSuwanosejima.
URL: http://www.dpri.kyoto-u.ac.jp/nenpo/nenpo.html
URI: http://hdl.handle.net/2433/129110
Appears in Collections:No.46 B

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