Crustal deformation of northeastern Japan based on geodetic data for recent 120 years
Crustal deformation of northeastern Japan based on geodetic data for recent 120 years
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基于近120年大地测量数据的日本东北部地壳形变
DOI：
10.5575/geosoc.2012.0027
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
Takuya Nishimura
中科院分区：
文献类型：
--
作者：
Takuya Nishimura
我们收集了大地三角测量、三边测量、水准测量、验潮仪以及连续GPS数据，以阐明2011年日本东北海域9.0级地震前120年期间日本东北部地壳变形的性质和时间变化。水平区域应变的特征是南北向拉伸和东西向压缩，分别持续了约90年和10年。在日本东北部中轴线的变形带以及日本海东部边缘观测到了东西向的大压缩应变。垂直变形是太平洋沿岸下沉的结果。除了福岛县太平洋一侧从1939年开始约20年观测到上升外，下沉速率在120年里大致保持不变。从1994年开始收集连续GPS观测数据，这些数据显示2000年左右福岛县东西向压缩速度减慢。板块间耦合估计表明，这种减速是由福岛县和茨城县近海耦合减弱引起的。这意味着东北 - 冲绳地震震源区部分的板块界面解锁，促成了地震破裂。大地测量变形和地质变形之间存在众所周知的差异；即使在大地测量应变率内部也存在较大的时间变化。东北 - 冲绳大地震事件并没有解决应变率之间的差异。持续的震后变形可能是解决这一差异的关键。
We accumulated geodetic triangulation, trilateration, leveling, tide-gauge, and continuous GPS data to clarify the nature and temporal variation of crustal deformation in northeastern Japan for the 120-year period preceding the 2011 Mw 9.0 Tohoku-Oki earthquake. Horizontal, regional strain is characterized by north–south extension and east–west compression for ~90 and 10 years, respectively. Large compressional strain in an east–west direction was observed in the deformation zone in the central axis of northeastern Japan and along the eastern margin of the Japan Sea. Vertical deformation is the result of subsidence along the Pacific coast. The subsidence rate was roughly constant for 120 years, except for the Pacific side of the Fukushima prefecture where uplift was observed for ~20 years beginning from 1939. Continuous GPS observations were collected from 1994 and show deceleration of east–west compressional velocity in the Fukushima prefecture around 2000. Interplate coupling estimates suggest that deceleration was caused by weakening of the coupling offshore of Fukushima and Ibaraki prefectures. This implies that the plate interface in part of the source region to the Tohoku-Oki earthquake was unlocked, contributing to the seismic rupture. There is a well-known discrepancy between geodetic deformation and geological deformation; there is also a large temporal variation even within geodetic strain rate. The giant Tohoku-Oki earthquake event did not resolve the discrepancy between strain rates. Ongoing post-seismic deformation may be the key to resolving this discrepancy.
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影响因子：
3
作者：
Fujii, Yushiro;Satake, Kenji;Kanazawa, Toshihiko
通讯作者：
Kanazawa, Toshihiko
DOI：
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发表时间：
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期刊：
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影响因子：
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DOI：
--
发表时间：
2009
期刊：
影响因子：
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作者：
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通讯作者：
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