论文部分内容阅读
一、引言 1976年唐山7.8级地震是我国大陆上发生的一次地震序列十分复杂的浅源强震,详细地研究该序列的时空强分布特征,找出它们之间的某些规律性,有助于认识其成因、类型和发震过程。本文将以唐山7.8级地震为中心,采用平面直角坐标系旋转变换方法,定量地给出唐山余震区长、短轴方向不同距离不同时间的地震分布指标,借以研究唐山地震的性质、序列特征和发展演化过程。
I. INTRODUCTION The 1976 Tangshan 7.8-magnitude earthquake is a very strong earthquake of shallow origin with a very complicated earthquake sequence in mainland China. It is of great help to study the temporal-spatial distribution of the sequence and find out some regularities between them. In understanding its causes, types and seismogenic processes. In this paper, the earthquakes with magnitude 7.8 Tangshan earthquake as the center and the plane rectangular coordinate system are used in this paper to quantitatively give the earthquake distribution indexes of Tangshan aftershocks at different distances in different directions at different distances, so as to study the characteristics of Tangshan earthquake, sequence features and Development and evolution.