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首页> 外文期刊>Earth, planets and space: EPS >Revisiting the three M~7 Miyagi-oki earthquakes in the 1930s: possible seismogenic slip on asperities that were re-ruptured during the 1978 M=7.4 Miyagi-oki earthquake
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Revisiting the three M~7 Miyagi-oki earthquakes in the 1930s: possible seismogenic slip on asperities that were re-ruptured during the 1978 M=7.4 Miyagi-oki earthquake

机译：回顾1930年代的3次M〜7宫城地震：可能在1978年M = 7.4宫城地震中再次破裂的粗糙物上发生地震。

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摘要

Hypocenters of main shocks and aftershocks of the 1933 M=7.1, 1936 M=7.4, 1937 M=7.1 and 1978 M=7.4 Miyagi-oki earthquakes are relocated using S-P times reported in the Seismological Bulletin of the Japan Meteorological Agency (JMA) and those re-read from original smoked-paper seismograms observed at the Mizusawa station of the National Astronomical Observatory of Japan (NAOJ) and the Mukaiyama station of Tohoku University. In order to reduce the error caused by inaccuracies of the arrival times and the small number of seismic observation stations, we determined the hypocenters by using a grid search method that assumed that the events occurred at the boundary between the subducting Pacific plate and the overriding plate. The main shock epicenters of these four earthquakes were determined to be close to each other, while the distributions of their aftershocks seem to disperse on the upper boundary of the Pacific plate. These distributions show that aftershock areas of the 1933, 1936 and 1937 events partly overlap with that of the 1978 event and occupy its easternmost, central and westernmost portions, respectively. This result suggests that the 1933, 1936 and 1937 events possibly ruptured a part of the source area of the 1978 event, i.e., its eastern, central and western portions, respectively.
机译：使用 S - P 日本气象厅（JMA）地震通报中报告的时间，以及从日本国立天文台（NAOJ）的水泽站和东北大学的Mukaiyama站观察到的原始烟纸地震图重新读取的时间。为了减少由于到达时间不正确和地震观测台数少而引起的误差，我们使用网格搜索方法确定震源，该方法假定事件发生在俯冲太平洋板块与上覆板块之间的边界处。确定这四次地震的主震震中点彼此接近，而余震的分布似乎分散在太平洋板块的上边界。这些分布表明，1933年，1936年和1937年地震的余震区与1978年地震的余震区有部分重叠，分别占据了最东端，中部和最西端。这一结果表明，1933年，1936年和1937年的事件可能会破坏1978年事件的源区的一部分，即分别是东部，中部和西部。

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