THE BOHAI EARTHQUAKE IS A MANTLE EARTHQUAKE
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摘要: 1969年7月18日13时24分50秒,渤海发生了一次7.4(MB)级地震,震源深度35km,从地壳厚度分布来看,震中区地壳厚度为29km.所以渤海地震很可能是一次地幔地震.本文从地震活动性、宏观特征分析开始,结合地壳厚度、居里等温面起伏以及地壳上地幔的电性结构和岩石实验材料,对这次地震的深部构造做了论述.Abstract: At 13:24:50 on July 18, 1969, an earthquake with magnitude of 7.4 (Mb) occurred in the Bohai sea, with its focal depth being 35 km. From the distribution of crustal thickness, it can be seen that the crustal thickness in the epicentral area is 29 km. So the Bohai earthquake is quite possibly a mantal earthquake. The deep structure of this earthquake has been discussed by analysis of seismic activity and macroscopic characteristics, combining with crustal thickness, the undulation of Curie's isotherm surface, the electrical structure of upper mantal of the crust and rock experiment material.
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Key words:
- Bohai /
- stress accumalation /
- upper mantal
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