Vertical deformation of the Japanese islands, 1996–1999
Vertical deformation of the Japanese islands, 1996–1999
复制标题
日本列岛的垂直变形，1996-1999
DOI：
10.1029/2002jb002129
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发表时间：
2003
影响因子：
--
通讯作者：
C. Scholz
中科院分区：
文献类型：
--
作者：
Y. Aoki;C. Scholz
[1]日本岛屿的震间垂直形变场是根据1996年至1999年的全球定位系统(GPS)数据得出的。虽然GPS速度的垂直分量由于噪声水平较高而很少被用作重要信息，但垂直形变场的信息将使我们能够将刚性板的运动与板间耦合引起的变形分开，因为水平位移包含两者的影响，而垂直位移仅包含板间耦合效应。结果表明：(1)垂直速度的精度一般好于2 mm/年；(2)四国和东海地区存在约8 mm/年的明显隆起峰，与南开和Suruga海槽的脆塑性渐变带强耦合；(3)东北地区由于日本海沟板块边界距离GPS测点太远，似乎不存在明显的隆起峰；(4)北海道西部有明显的隆起。这可能与1983年日本海和1993年北海道-南海(M=7.6)地震的长期震后形变有关。(5)日本东北部沿日本海沿岸的隆升明显与早期俯冲造成的分布挤压有关。
[1] The interseismic vertical deformation field of the Japanese islands is derived from the Global Positioning System (GPS) data between 1996 and 1999. Although vertical components of the GPS velocities have rarely been used as important information because of their higher noise level, information on the vertical deformation field will enable us to separate rigid plate motions from deformation due to interplate coupling because horizontal displacements contain both effects, whereas vertical displacements contain only the interplate coupling effect. The results show that (1) the precision of the vertical velocity is generally better than 2 mm/yr, (2) the existence of clear uplift peaks of about 8 mm/yr in the Shikoku and Tokai regions is consistent with strong coupling with a gradual brittleplastic transition zone at the Nankai and the Suruga trough, respectively, (3) clear uplift peaks do not seem to exist in the Tohoku region because the Japan trench plate boundary is too far oceanward from the GPS sites, (4) significant uplift is obtained in the western part of Hokkaido, which may be associated with the long-term postseismic deformation due to the 1983 Japan Sea and the 1993 Hokkaido-nansei-oki (M = 7.6) earthquakes, and (5) uplift in northeastern Japan along the Japan Sea coast is apparently associated with distributed compression due to incipient subduction.