SEISMIC OBSERVATIONS AND INFRARED THERMAL SURVEYS OF THE 1990-1993 ERUPTION OF UNZEN VOLCANO :

• UMAKOSHI,Kodo

  Research Associate Shimabara Earthquake and Volcano Observatory, Faculty of Science, Kyushu University

• SHIMIZU,Hiroshi

  Associate Professor Shimabara Earthquake and Volcano Observatory, Faculty of Science, Kyushu University

• MATSUWO,Norimichi

  Research Associate Shimabara Earthquake and Volcano Observatory, Faculty of Science, Kyushu University

• MATSUSHIMA,Takeshi

  Research Associate Shimabara Earthquake and Volcano Observatory, Faculty of Science, Kyushu University

• OHTA,Kazuya

  Professor Shimabara Earthquake and Volcano Observatory, Faculty of Science, Kyushu University

抄録

Mt. Fugen (Unzen Volcano) started to erupt on November 17,1990,after 198 years of dormancy. Since a lava dome started to grow, there have been frequent pyroclastic flows that have caused severe damage to Shimabara City and Fukae Township. The seismic network operated by Kyushu University had detected precursory seismic activity prior to the eruption. After the first eruption, temporary seismic stations were densely deployed near to and around the peak of Mt. Fugen. In addition, new permanent seismic stations were established. The regional seismicity in and around Unzen Volcano has decreased markedly since the emergence of the lava dome. This is probably because excess magma pressure was released due to the lava extrusion. Summit earthquakes often have increased just before lava extrusion from a new vent. In these cases, it has been possible to determine the growth of new lobes in advance. A thermal survey using as infrared thermal video system was begun after the start of lava dome extrusion. It gives the surface temperature distributions of the lava dome and the pyroclastic flow deposits and has proved useful in ascertaining the extrusion of fresh lava and in discriminating the latest pyroclastic flow deposits from previous ones.

収録刊行物

• Journal of natural disaster science

  Journal of natural disaster science 15 (2), 63-77,

  Japanese Group for the Study of Natural Disaster Science

キーワード

• Unzen Volcano
• Mt. Fugen
• Seismic observation
• Infrared thermal survey
• Lava dome
• Pyroclastic flow

詳細情報

• CRID: 1541135670326667136
• NII論文ID: 110002674182
• NII書誌ID: AA10898116
• Web Site: http://dl.ndl.go.jp/info:ndljp/pid/11150278
• 本文言語コード: en
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