Fault mechanism and recurrence time of major earthquakes in southern Kanto district, Japan, as deduced from coastal terrace data
Fault mechanism and recurrence time of major earthquakes in southern Kanto district, Japan, as deduced from coastal terrace data
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从海岸阶地资料推论日本关东南部地区大地震的断层机制及重现时间
DOI：
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发表时间：
1978
期刊：
影响因子：
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通讯作者：
N. Yonekura
中科院分区：
文献类型：
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作者：
T. Matsuda;Y. Ota;M. Ando;M. Ando;N. Yonekura
在过去的1000年中，关东南部地区的8级或更大的冲击。它们是1703年和1923年的地震，发生在萨加米谷（Sagami Wolf），这是菲律宾海壳板的东北边界，与亚洲板块接触。尽管它们发生在几乎同一地区，但1703年的地震与1923年沿海隆起和海啸高度的地震有显着不同。 1703年的地震变形是根据南部关东南部海岸海洋露台的高度进行了描述的。由于低角度右侧断层和板边界处的推力分量，地震和1923年的地震也是1923年的地震。但是，1703年的断层表面更长（约200公里），比1923年地震较远。根据沿海隆升的模式和萨加米槽的趋势，1703地震的断层表面可以分为三个平面，这涉及西部1923年地震的源区域的东部地区（平面A A ），中间的川川潜艇悬崖（平面B），以及1953年Boso-Oki地震的源区域附近的一部分（m等于8.0）向东（平面C）。至少在过去的6，000年中，在关东酸味地区的Boso和Miura Peninsulas受到了振奋，并且多次伴随着1703年和1923年的地震伴随着大量的地震。根据Boso Peninsula隆升的全新世露台的数量，在过去6000年中的动荡速度以及当前的大地测量数据的基础上，类似隆起的复发时间估计为800至1,500年。因此，在不久的将来，诸如1703年和1923年地震等主要地震不太可能发生。然而在过去6，000年中，那里的平均隆起率明显少得多。 /作者/
The southern Kanto region has had two shocks of magnitude 8 or greater during the past 1,000 years. They were the 1703 and 1923 earthquakes, which occurred along the Sagami trough, a northeastern boundary of the Philippine Sea crustal plate in contact with the Asian plate. Although they occurred in nearly the same region, the 1703 earthquake was significantly different from the 1923 earthquake in the distribution of coastal uplift and tsunami height. The 1703 earthquake deformation is described on the basis of the height of the marine terraces along the coast of the southern Kanto region. The 1703 earthquake is interpreted, as is the 1923 earthquake, as the result of low-angle right-lateral faulting with a thrust component at the plate boundary. However, the fault surface in 1703 was longer (about 200 km) and was located farther east than that of the 1923 earthquake. On the basis of the pattern of coastal uplift and the trend of the Sagami trough, the fault surface of the 1703 earthquake can be divided into three planes, which involve the eastern part of the source region of the 1923 earthquake to the west (plane A), the Kamogawa submarine cliff in the middle (plane B), and a segment near the source region of the 1953 Boso-Oki earthquake (M equals 8.0) to the east (plane C). The Boso and Miura Peninsulas in the sourthern Kanto region have been uplifted during at least the last 6,000 years, and major uplifts have been accompained by earthquakes like those of 1703 and 1923 many times. The recurrence time of similar uplifts is estimated at 800 to 1,500 years on the basis of the numbers of the uplifted Holocene terraces in the Boso Peninsula, the rate of upheaval during the last 6,000 years, and the present geodetic data. Thus, it is unlikely that major earthquakes such as the 1703 and 1923 earthquakes will occur in the same segments in the near future. The Oiso area, however, which is located west of the western end of the 1703 faulting, seems higher in seismic risk than the other parts of the Sagami trough fault, because the sum of the recent uplift in the 1703 and 1923 earthquakes in that area is significantly less than the average rate of uplift there during the past 6,000 years. /Author/