Title : An extension of lower crust in central Kyushu, Japan,inferred from GPS derived velocity field,“An Implication of Beppu-Shimabara graben structure” ( An extension of lower crust in central Kyushu, Japan, inferred from GPS derived velocity field- An Implication of Beppu-Shimaba ra graben structure (بازشدگی در پوسته تحتانی کیوشو-زاپن) )
Authors: Sayyed Keivan Hosseini , Shoichi Yoshioka , Takeshi Matsushima , Sadaomi Suzuki ,
Full TextAbstract
A dense array of GPS tracking network in Japan provide us a good tool for monitoring crustal deformation. We carried out an inversion analysis of GPS derived velocity vectors, considering different model source regions during the period from Jan. 1, 1998 to Dec. 31, 2002. We proposed a dislocation model for the central Kyushu region where right lateral strike-slip is dominant in the lower crust at depths of 20-30 km. However, a NS oriented extensional model is also partly supported from Mt. Aso to the Shimabara peninsula which may shows the activity of a rift valley forming in the continental crust (Beppu-Shimabara Graben). This is consistent with the result obtained by the triangulation surveys conducted over the last 100 years (Tada, 1984) and the negative gravity anomalies (Komazawa and Kamata, 1985) and focal mechanisms of large earthquakes (Yamashina and Murai, 1975).
Keywords
, Lower crust, Strain, GPS, Kyushu, Extension
@inproceedings{paperid:410,
author = {Hosseini, Sayyed Keivan and Shoichi Yoshioka and Takeshi Matsushima and Sadaomi Suzuki},
title = {An extension of lower crust in central Kyushu, Japan,inferred from GPS derived velocity field,“An Implication of Beppu-Shimabara graben structure”},
booktitle = {همایش بین المللی انجمن ژئوفیزیک و ژئودزی},
year = {2007},
location = {پروگیا, ITALY},
keywords = {Lower crust; Strain; GPS; Kyushu; Extension},
}
%0 Conference Proceedings
%T An extension of lower crust in central Kyushu, Japan,inferred from GPS derived velocity field,“An Implication of Beppu-Shimabara graben structure”
%A Hosseini, Sayyed Keivan
%A Shoichi Yoshioka
%A Takeshi Matsushima
%A Sadaomi Suzuki
%J همایش بین المللی انجمن ژئوفیزیک و ژئودزی
%D 2007
