鈴鹿山地東縁断層のP波浅層反射法地震探査 : 2005年西野尻測線

概要

論文の詳細を見る
We present new, high-resolution seismic reflection data (2005 Nishi-Nojiri profile) acquired across the forelimb of the Suzuka basement-involved fold and Ichinohara flexure to further image their subsurface geometries. A seismic source (mini-vibrator) and 180-channel digital telemetry recording system were used in an off-end configuration with the nearest receiver adjacent to the source to record seismic waves from deeper reflection points. A 10-m source and geophone spacing give a 5-m CMP (common midpoint) spacing on the final section. The nominal CMP stacking fold had 90 traces. We also suppressed coherent noise by repeating source points 5 times. After data processing including surface-consistent statics, velocity analysis, normal moveout (NMO) correction, residual statics, CMP stack, and migration, the section was finally depth-converted using stacking velocities. Reflectors imaged on the seismic profile Illuminate that the forelimb composed of Pliocene-Pleistocene Tokai Group and underlying Mesozoic basement rocks are thrust over the Tokai Group in the footwall.
東京大学の論文
2007-08-20