有珠火山における人工地雷探査 : 観測および初動の読み取り

概要

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Seismic exploration using artificial sources was conducted at Usu volcano, Japan in November,2001 by 58 participants from nine national universities, Japan Meteorological Agency, Japan Nuclear Cycle Development, and Institute of Physical and Chemical Research to investigate subsurface seismic structures. The exploration was the eighth joint experiment under the National Project for Prediction of Volcanic Eruptions. A total of 288 temporal stations equipped with a 2Hz vertical component seismometer and a portable data logger were deployed in and around Usu volcano and Toya caldera. Dynamite shots with charges of 200-250kg were detonated at seven locations andseismic signals were successfully recorded. To reveal the P-wave velocity structure, first arrivaltimes were picked from the seismograms and 1877 useful arrival times are listed in this paper. From the record sections and the arrival time data, characteristics reflecting the geological structure of the experimental area were identified.
東京大学地震研究所,Earthquake Research Institute, University of Tokyo,北海道大学大学院理学研究科,Graduate School of Science, Hokkaido University,秋田大学工学資源学部,Faculty of Engineering and Resource Science, Akita University,九州大学大学院理学研究科,Graduate School of Science, Kyushu University,の論文