@article{oai:nipr.repo.nii.ac.jp:00009155, author = {宮町, 宏樹 and 村上, 寛史 and 筒井, 智樹 and 戸田, 茂 and 民田, 利明 and 柳澤, 盛雄 and Miyamachi, Hiroki and Murakami, Hiroshi and Tsutsui, Tomoki and Toda, Shigeru and Minta, Toshiaki and Yanagisawa, Morio}, issue = {1}, journal = {南極資料, Antarctic Record}, month = {Mar}, note = {P(論文), JARE-41(1999-2000夏期間)において, 東南極のみずほルート上のS17からZ20にかけ, 屈折法地震探査を実施した。測線長約180kmの測線上に160台の地震観測点を配置し, 5カ所で薬量600kg程度の大発破, 他の2カ所でそれぞれ薬量250kgの中発破および薬量25kgの小発破を行った。大発破点からの距離が100km以下では, 明瞭な初動が観測された。また, 氷床中を伝播して来た波, 分散波および後続波(反射波)も観測された。初動走時から, 氷床の地震波速度が3.6-3.8km/s, 氷床直下の基盤層(岩盤)のみかけ速度がほぼ6.2km/sであることがわかった。本報告は, 実験の概要と得られたデータについて述べる。, A seismic refraction experiment was successfully conducted along the S17-Z20 profile on the Mizuho route, in East Antarctica, in the austral summer season of 1999-2000 (JARE-41). One hundred sixty seismic stations were temporarily installed along the profile about 180km long and five large shots with dynamite of about 600kg were fired. In addition, two shots with charge sizes of 250kg and 25kg were arranged along the profile. The obtained seismic records show the clear onsets of the first arrivals in a distance range of less than 100km from each large shot. In particular, seismic waves traveling through the ice sheet and the dispersed surface waves are distinctly observed. Some later phases are also detected. The first travel time data obtained show that a P-wave velocity in the ice sheet is 3.6-3.8km/s and an apparent velocity in the rock basement just beneath the ice sheet is almost 6.2km/s. This report describes the basic outline of the experiment and the seismic data obtained.}, pages = {101--147}, title = {東南極みずほ高原における屈折法地震探査実験-第41次夏期観測概要-}, volume = {45}, year = {2001}, yomi = {ミヤマチ, ヒロキ and ムラカミ, ヒロシ and ツツイ, トモキ and トダ, シゲル and ミンタ, トシアキ and ヤナギサワ, モリオ} }