人工地震による中部日本北部の地殻構造調査 - 富山-上宝測線 -

Abstract

A seismic survey was carried out along a east-west line in northern Chubu district, October, 1991.Seismic waves from four explosions in the experiment were observed along another line of about 70 km extending in north and south directions from Shot-3 at the border of Toyama and Gifu Prefectures.37 temporary stations were set along the line which crosses large active faults of Ushikubi and Atotsugawa faults. Although clear first arrivals from Shot-3 were recorded, no obvious delays in travel times were found at the faults.Records of Shots 1 and 2, about 8S and 135 km away from the line to the east, respectively, show clear later arrivals, which indicate reflected waves from middle of the crust benearth mountaneous region of central Honshu.