1918年南澳7.5级地震构造应力场的光弹模拟  

PHOTOELASTIC SIMULATION ON TECTONIC STRESS FIELD OF THE 1918 M7.5 NANAO EARTHQUAKE

作　　者：颜玉定[1] 陈恩民[1] 

机构地区：[1]广东省地震局,广州510070

出　　处：《华南地震》1997年第3期81-86,共6页South China Journal of Seismology

摘　　要：通过光弹模拟实验，获得了1918年南澳7.5级地震震源区及其邻区的构造应力标。结果表明：本区在290°方向的外场力（压力）作用下，南澳附近区域性应力集中范围最大；岩体同时沿NNW和NEE向两条断裂破裂，前者破裂深度约9．5km，后者约18．1km；地震的最大震级为7．7级。地震的剪切应变能NEE向断裂占92％；NNW向断裂只占8％。模拟实验结果与实地考察的结果基本一致。The Tectonic stree field in the seismic source zone of the 1918 M7. 5 Nanao earthquake and its neighbouring region is simulated by photoelastic experiment. The test result shows that by the action of the external field force, which is in the derection of 290°and uniformly distributed compression, the range of regional stress concentration near Nanao is largest;the rock mass cracked simultaneously along two breaks in the directions of NNW and NEE, their rupture depth were about 9. 5km and 18. 1km respectively; the maximum magnitude of this earthquake was 7. 7, and its shearing strain energy at the NEE-oriented break was in possesson of 92 %, but at the NNW only 8 %, so it is shown that this earthquake was chiefly in NEE-oriented. The result from the simulation experiment was basically in agreement with that of site investigation-

关 键 词：构造应力场 光弹性实验 震级 地震预报 

分 类 号：P315.7[天文地球—地震学] P315.2[天文地球—固体地球物理学]