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震惊中外的唐山大地震,引起了科学界的普遍关注。我国地震地质工作者经过调查研究从中发现,北北东向断裂是其发震构造,力学性质呈现张性;震源机制资料北东节面为顺时针滑动这种现象也曾出现在邢台地震。这些现象所反映的应力作用方式与燕山运动时期的新华夏构造呈压性反扭迥然不同。燕山运动时期的应力作用方式是南北向挤压和南北方向反扭,并导生出北西—南东向挤压和北东—南西向引张。因此发生了北东向压性反扭、北西向张性顺扭的构造形迹。它们从什么时候发生了变化?是局部还是区域的?本文试图从构造形迹、海水进退、现今地形变和天然地震等方面予以探讨。
Tangshan earthquake shocked both at home and abroad, aroused widespread concern in the scientific community. According to the investigation and study of China’s earthquake geologists, it is found that the north-north eastward fault is its seismogenic structure and its mechanical properties are in tension. The focal mechanism data of the northeast section of the southeastern section slides clockwise. This phenomenon has also occurred in the Xingtai earthquake. The stress action mode reflected by these phenomena is quite different from that of the Neo-Huaxia structure during the Yanshan Movement. During the Yanshan movement, the stress mode is north-south extrusion and north-south anti-twist, and leads to NW-NS extrusion and NE-NS westward extension. Therefore, a northerly compressive and anti-torsional, northwest to Zhang Xingshun structural traces. When did they change or are they local or regional? This paper attempts to explore the aspects of structure, seawater, current deformation and natural earthquakes.