一の目潟捕獲岩の弾性波速度測定に基づいた東北本州弧下部地殻の岩石学的モデル

抄録

In this study, we compare the P-wave velocity (Vp) and S-wave velocity (Vs) crustal model of the NE Honshu arc by Nakajima (unpublished) with the laboratory measurements of Vp and Vs values by Nishimoto et al. (this meeting), and interprete petrological/ seismic crustal structure. The Vp and Vs of lower crustal layer beneath the back-arc side are comparable to the measured Vp and Vs values of Ichino-megata mafic xenoliths (hb. (px.) gabbro and/or amphibolite) at solidus conditions (600-700 deg.C).