著者
山中 浩明 瀬尾 和大 佐間野 隆憲 翠川 三郎
出版者
公益社団法人 日本地震学会
雑誌
地震 第2輯 (ISSN:00371114)
巻号頁・発行日
vol.39, no.4, pp.607-620, 1986-12-25 (Released:2010-03-11)
参考文献数
21

The seismic refraction prospecting was carried out in the southwestern part of the Tokyo Metropolitan area, to clarify the deep underground structure down to uppermost layer of the Earth's crust. The explosions were denoted at Nagatsuta, Kurokawa, Okazu and Yumenoshima. The explosion at Nagatsuta was planned to make clear the existence of vertical discontinuity of the basement between Nagatsuta and Yumenoshima, which has been suggested from the observation of Yumenoshima explosion. The underground structure was revealed by the travel time analysis. The main features of the underground structure are as follows:1) The underground structure consists of 4 layers. The P wave velocities of these layers are 1.8 to 2.0, 2.9, 4.8 and 5.5km/s, respectively.2) The thickness of the third leyer is several kilometers in this area, however this layer doesn't exist in the central part of the Kanto plain.3) The first layer is thinner than the second one in contrast with the underground structure of Yumenoshima situated on the center of the Kanto plain.4) The vertical discontinuity of the basement was not confirmed from Nagatsuta explosion, because the refracted wave from the basement was not observed as an initial motion at the expected stations.

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大学がダイナマイト発破実験でつくった 人工地震なんて普通の話で いくらでも論文にもなってるの知ってるよね? これと報道の自由と何の関係があるの? 陰謀論界隈のデマと混同してない? https://t.co/n5b971fDqh
@soupgrande001 @hiyo_hairyheart 人工地震のデマってこういうのちゃんと読まない人の積み重ねなんだよね。 実際は「発破」とか「エアガン」とかが使われるけど妄想の中でどんどん育ってるみたい。 https://t.co/BqJsWZptA0
https://t.co/GFrAuOnCbL
人工地震ってほんとにあるのね https://t.co/vRAuPDCNlW

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