氏名歌田久司
職名教授
所属海半球観測研究センター
専門地球電磁気学

最終更新日 04/06 2007

研究内容

(1) グローバルスケールからローカルスケールまでの地球内部の電気伝導度構造の研究 (2) グローバルな観測網と海底ケーブルネットワークによる地球磁場と電場の長期変動の研究 (3) 海底電磁気観測 (4) コアおよびコアーマントルダイナミクスの研究 (5) 電磁誘導法による地球内部構造解析手法の開発 (6) さまざまな地球電磁気観測装置の開発 (7) 電磁気的手法による火山活動の研究 (8) 地震に関連した電磁気現象の研究

主要論文・著書

Utada, H., On the physical background of the VAN earthquake prediction method, Tectonophysics, 224, 153--160, 1993.

Utada, H., T. Yoshino, T. Okubo, and T. Yukutake, Seismic resistivity changes observed at Aburatsubo, central Japan, revisited, Tectonophysics, 299, 317--331, 1998.

Utada, H., M. Neki, and T. Kagiyama, A study of annual variations in the geomagnetic total intensity with special attention to detecting volcanomagnetic signals, Earth Planets Space, 52, 91--103, 2000.

Utada, H., and H. Munekane, On galvanic distortion of regional three-dimensional magnetotelluric impedances, Geophys. J. Int., 140, 2, 385--398, 2000.

Ogawa, T, and H. Utada, Coseismic piezoelectric effects due to a dislocation 1. An analytic far and early-time field solution in a homogeneous whole space, Phys. Earth Planet. Inter., 121, 273--288, 2000.

Koyama, T., H. Shimizu, and H. Utada, Possible effects of lateral heterogeneity in the D'' layer on electromagnetic variations of core origin, Phys. Earth Planet. Inter., 129, 99--116, 2002.

Utada, H., Koyama, T., Shimizu, H., and Chave, A. D, A semi-global reference model for electrical conductivity in the mid-mantle beneath the north Pacific region, Geophys. Res. Lett., 30, 4, doi:10.102--1194, 2003.

Utada, H., Interpretation of time changes in the apparent resistivity observed prior to the 1986 eruption of Izu-Oshima volcano, Japan, J. Volcanol. Geotherm. Res., 126, 97--107, 2003.

Fukao, Y., T. Koyama, M. Obayashi, and H. Utada, Trans-pacific temperature field in the mantle transition region derived from seismic and electromagnetic tomography, Earth Planet. Sci. Lett., 217, 425--434, 2004.

Shimizu, H., and H. Utada, The feasibility of using decadal cahnges in the geoelectric field to probe Earth's core, Phys. Earth Planet. Inter., 142, 297--319, 2004.

Koyama, T., H. Shimizu, H. Utada, M. Ichiki, E. Ohtani, and R. Hae, Water Content in the Mantle Transition Zone Beneath the North Pacific Derived From the Electrical Conductivity Anomaly, AGU Geophys. Monogr. Ser., 168, 171--179, 2006.