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1932年12月25日发生在我国祁连山区的昌马7.5级地震,对于人们研究大地震发生的地质构造条件方面,是一个值得很好总结的震例。1964年时振梁等对该地震的调查研究,提供了很宝贵的资料。1974年原兰州地震大队对这一地震继续开展工作时,笔者参加了半年实地考察。此次考察成果亦有所介绍。笔者至今以为,有关此次地震于地表出现的地震破裂带特征,特别在其空间展布、力学性质以及由此所反映的区域构造应力场特征等方面,尚有值得进一步研究之处。本文拟就一些问题作一探讨,并对前人研究中的某些问题进行商榷。
The 7.5 magnitude Changma earthquake that occurred on December 25, 1932 in the Qilian Mountains of our country is a well-deserved summary of the geological conditions for the study of the major earthquakes. In 1964, Zhenliang and others provided valuable information on the investigation of the earthquake. When the original Lanzhou earthquake brigade continued its work on this earthquake in 1974, I participated in a field survey of six months. The inspection results have also been introduced. The author believes that there are some worthy further studies on the features of the earthquake rupture zone on the earth’s surface, especially its spatial distribution, mechanical properties and the characteristics of the regional tectonic stress field reflected by it. This article intends to make some discussions on some issues and to discuss some of the problems in previous studies.