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本文通过西藏当雄—崩错一带1951—1952年间8级地震(包括前震和余震)形成的地震形变带的初步考察,对地震形变带通过不同岩性时所产生的形变类型的主要特征、力学性质等进行较详细描述,对形成该期地震的应力场特点及控震、发震构造进行初步探讨。 西藏地区地处地中海-南亚地震带东段,是一个地震频度高、强度大的地震区。该区在1950年以前,历史地震记录不完整,准确性差实地考察资料也不多见。1950年以后才开始有较系统和详细的地震记录资料 1980和1981年,笔者对当雄—崩错一带1951—1952年间,西藏发生最强地震之一(8级)所产生的地震形变带进行了初步考察,虽然从地震发生至考察时,已隔近30年之久,但地震形变仍保存十分完好。通过对它的研究,对于探讨该期地震控震和发震构造的特点,地震破裂的性质与过程,分析地质构造及其应力场的演变,都是十分有意义的珍贵资料。
In this paper, through the preliminary investigation of the seismic deformation zone formed by the M 8-magnitude earthquake (including the foreshocks and aftershocks) between 1951 and 1952 in the area of Dangxiong-Bengbu, Tibet, the main characteristics of the deformation types produced when the seismic deformation zone passes through different lithologies, Nature and so on for a detailed description of the formation of the earthquake stress field characteristics and seismic control, seismogenic structure to conduct a preliminary study. Located in the eastern part of the Mediterranean Sea - South Asia Seismic Belt, Tibet is an earthquake area of high seismic intensity and strong intensity. The area before 1950, the history of the earthquake records are not complete, the accuracy of field visit data is rare. More systematic and detailed records of seismographies began after 1950. In 1980 and 1981, the authors conducted a study of the seismic strain caused by one of the strongest earthquakes in Tibet (Level 8) between 1951 and 1952 during the Dangxiong-Bengbu fault A preliminary survey, although from the time of the earthquake to investigate, nearly 30 years apart, but the earthquake deformation is still well preserved. Through its study, it is very valuable and valuable data to study the characteristics of earthquake-controlled and seismogenic structures, the nature and process of earthquake rupture, the evolution of geological structure and its stress field.