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利用1966—1978年间华北地区区域地震台记录的5级以下地震的初动方向,通过求平均节面解推断出13个分区的地壳构造应力场的主应力轴方向.通过数值试验论证了利用多个断层面随机取向的地震的 P、B、T 轴推断构造应力主轴方向的可能性.讨论了在推断构造应力场方向时,利用多个小地震资料比利用大地震资料所具有的优越性.用尝试法对所有可能解的三维参数空间以5°×5°×5°的间隔进行了扫描搜索,改进了扫描方法,节省了计算时间.
The direction of the principal stress axis of the crustal tectonic stress field of 13 subareas was deduced by averaging section solutions using the initial moving direction of earthquakes below M5 recorded by regional seismological stations in North China from 1966 to 1978. The numerical experiments demonstrate that using more P, B, T axis of fault with randomly oriented faults can infer the possibility of tectonic stress axis direction.The advantages of using multiple small seismic data compared with large seismic data are deduced in the direction of tectonic stress field. By using the try method, all the possible three-dimensional parametric space of the solution was scanned and searched at an interval of 5 ° × 5 ° × 5 ° to improve the scanning method and save the calculation time.