ULF GEOMAGNETIC CHANGES ASSOCIATED WITH CRUSTAL ACTIVITY

Proceeding National Seminar on Space Science III, Lapan, Bandung 2007

ULF GEOMAGNETIC CHANGES ASSOCIATED WITH CRUSTAL ACTIVITY

Katsumi Hattori1*, Masashi Hayakawa2, Nobuhiro Isezaki1,
Kiyohumi Yumoto3, Toshiyasu Nagao4, and Seiya Uyeda4
1 Dept. of Earth Sciences, Fac. of Science, Chiba University Japan,
2 The University of Electro-Communications, Japan,
3 Kyushu University, Japan.
4 Earthquake Prediction Research Center, Tokai University, Japan

Abstract
Despite its extreme importance and years of effort, practical short-term earthquake prediction still remains to be achieved in future. However, earthquake- related electromagnetic phenomena are recently considered as a promising candidate for short-term earthquake prediction. There have been accumulated a lot of evidences of precursory signatures in a wide frequency range (DC-VHF). The ULF geomagnetic change is one of the most promising phenomena and it suggests that the short-term prediction is expected to realize. The recent progress and the state of the art in Japan will be present in the talk. Especially, the methodologies to detect abnormal changes in ULF electromagnetic approach are described in this paper.
Key words: earthquake- related electromagnetic phenomena, short-term earthquake prediction, precursory signatures, ULF geomagnetic change, ULF short-term