Earth Planets Space, Vol. 52 (No. 8), pp. ix-xviii, 2000

Crustal deformation associated with crustal activities in the northern Izu-islands area during the summer, 2000

Masaru Kaidzu, Takuya Nishimura, Makoto Murakami, Shinzaburo Ozawa, Takeshi Sagiya, Hiroshi Yarai, and Tetsuro Imakiire

Geographical Survey Institute, Kitasato-1, Tsukuba, Ibaraki 305-0811, Japan

(Received September 6, 2000; Revised September 8, 2000; Accepted September 8, 2000)

Abstract: In the end of June, 2000, intense crustal activity took place in Miyake-jima, Niijima, Kozu-shima and their vicinity. Here we report on the crustal deformation in the area during the period from June 24 to September 4, 2000, detected with the nationwide Global Positioning System (GPS) array operated by the Geographical Survey Institute. The deformation in this area during the above period is characterized by the deflation of Miyake-jima and the extension of the crust in the northeast-southwest direction over a wide area.