摘要
对中国大陆地震的空间分布进行了仔细的探讨，发现6级以上强震在西部（东经105°线以西）有三组近似是对称分布的空带现象，每组平行空带相邻带间距为5°，带宽约为1°；而东部则有两组NE、NW向空带将其分割成若干强震块体，相邻空带宽约700km，带宽约为150km。6级以下地震在空间上几乎随机分布。理论推导证明：强震空带现象其实质为一些不连续块状分布的强震区在空间的有序排列，且控制东西两部分构造运动的构造波波长均约1000km，并在同一机理下还统一地解释了强震等间距及构造带等间距现象。应力场反演表明，大陆西部受三组主次不同的边界力源作用。在研究过程中还发现气、油等轻而易于流动的物质的聚集区多分布在强震空带内，而金属矿藏多分布在强震块体内，同时从空带分布图即简单的地震危险区划图上可以看到，千百年来已发展建设成的大型城市多位于“安全岛”内。
The authors discuss in detail the seismic spatial distribution in China continent, they findthat the strong earthquakes with Ms ≥6. 0 in western China distribute in three groups ofsymmitry gap belts, the space length of each group of parallel belts is 5°, wideth of the belt is1°, and two groups of NE and NW gap belts in eastern China divide the symmitry gap belts inseveral parts of strong earthquakes. The length of adjacent belts is 700km, the wideth is150km. The earthquakes with Ms≥6. 0 are random distribution in the space. Theoretical derivation proofs that the strong earthquake gap belts arrange ordered in the space, and the lengthof tectonic wave which controls the structure movement in eastern and western China is about1000km. And the authors explain the equally spaces of the strong earthquakes and tectonicbelts under the same mechanism.Inversion of stress field shows that the western China is acted by three groups of boundaryforce sources. The authors find that the fluid matter, such as gas and oil, distribute in thestrong earthquake gap belts, metal mineral in the strong earthquake zones, and the big citiesin the 'safty' places.
出处
《高原地震》
1997年第1期1-11,共11页
Plateau Earthquake Research
基金
地震科学联合基金!95127
关键词
强震空带
构造波
应力场
矿藏
Strong earthquake gap
Tectonic wave
Stress field
Mine
