Timing and displacement of holocene faulting on the median tectonic line in central shikoku, southwest japan
Timing and displacement of holocene faulting on the median tectonic line in central shikoku, southwest japan
复制标题
日本西南部四国中部中部构造线上全新世断层活动的时间和位移
DOI：
10.1016/0191-8141(91)90069-u
复制
发表时间：
1991
影响因子：
3.1
通讯作者：
T. Tsukuda
中科院分区：
文献类型：
--
作者：
H. Tsutsumi;A. Okada;T. Nakata;M. Ando;T. Tsukuda
中央构造线（MTL）平行于日本西南岛弧的总趋势延伸约900公里。在第四纪，MTL的中段一直处于活动状态。虽然平均滑动率沿着的MTL是几毫米a-1，有没有破坏性地震的历史记录沿着它。为了收集数据的行为MTL在晚全新世时代，特别是在地震事件的时间和位移量在每个事件，沟槽研究进行了在四国中部的活动段在1984年和1988年。结果表明：（1）四国中部MTL上最近的两次滑动地震发生在公元世纪初，距今3250 ~ 2820年; (2)最近一次地震的位移量约为5.7m;（3）最近一次地震的震级估计为7.9级（4）四国中部晚第四纪MTL活动轨迹的平均滑动速率沿着为5-8 mm a ~（-1）。
The Median Tectonic Line (MTL) extends about 900 km parallel to the general trend of the southwest Japan island arc. The central segment of the MTL has been active during the Quaternary. Although the average slip-rate along the MTL is up to several mm a-1, there is no historical record of destructive earthquakes along it. In order to collect data on the behavior of the MTL during late Holocene times, especially on the timing of seismic events and the amount of displacement during each event, trench studies were conducted on the active segment in central Shikoku in 1984 and 1988. The results are summarized as follows: (1) the latest two seismic events produced by slip on the MTL in central Shikoku occurred during the early 8th century A.D., and between 3250 and 2820 years B.P.; (2) the amount of displacement during the latest event is inferred to have been about 5.7 m; (3) the earthquake magnitude for the latest event is estimated at 7.9 (Richter scale), and a fault-segment trace about 70 km long ruptured during that event; (4) an average slip-rate along the active trace of the MTL in central Shikoku during the late Quaternary is estimated to be 5–8 mm a-1.