北京的地震

1.緒言北京地区自古以来曾遭受多次剧烈地震的影响,迄今仍未趋于稳定。为了保障人民生命、財产和建設事業的安全,研究北京的地震現象,确定地震危險性的程度,以便采取适当的抗震措施,显然是当前刻不容緩的任务。远在1954年春,在中国科学院地震工作委員会的領导下,即开展了北京地震的研究。在工作过程中,經地球物理研究所和历史研究所第三所的密切配合并得到北京市

EARTHQUAKES OF PEKING

As far as historical records are concerned, Peking has been effected by at least 170 earthquakes of which 11 are damaging. The most destructive earthquakes effecting Peking are the San-Ho earthquake of Sept. 2, 1679 and the earthquake of Sept. 80, 1780 occurring in the Hsi-Shan area. The frequency of occurrence of earthquakes in Peking is not uniform. It seems to have reached a maximum in the 17th century and is comparatively low at the present time. However, instrumental observations showed that the Hsi-Shan area is not stable. In this paper, several of the important historical earthquakes are described in detail, especially those of 1679 and 1780. Particular attention has been paid to the damages done to structures by these earthquakes. The regional division into seismic zones of the whole Chinese territory has been carried out by Professor G. P. Gorshkov and Peking is located in an 8-degree zone. However, for construction purposes, the variation in seismicity in the Peking area is required. Without adequate instrumental data, this can best be obtained by taking account of the hydrogeological conditions and characteristics of the ground. The method was originally examined by A. Sieberg, but has since been greatly extended and made more definite by Professor S. V. Medvedev. This method is described in detail in the present paper and a micro-seismic map of the Peking area is given.