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本文系统地介绍了地震区三角网平差和利用平差结果反演断层参数的“随机尝试——动态平差”方法.通过新丰江水库5.3级地震区三角测量资料的处理,进一步阐述如何应用这种方法,并给出反演5.3级地震断层参数结果:断层走向北东62°,倾向南东,倾角59°,断层长4.7公里,上界面深0.45公里,下界面深4.5公里,倾向滑距73.4毫米,走向滑距25.5毫米,为正断右旋走滑断层,地震矩 m_0=2.0×10~(24)达因·厘米,应力降σ=12巴,释放的应变能下限 E=1.2×10~(19)尔格.文中依据所得结果,结合地震机制和构造资料讨论了新丰江水库地震的力源问题,指出区域应力场是主要力源,水压应力场是主要的诱发力源。
This paper systematically introduces the “random try-dynamic adjustment” method of triangulation adjustment in seismic area and inversion of fault parameters by using the adjustment results.Through the processing of the triangulation data of the 5.3-magnitude earthquake area in Xinfengjiang Reservoir, we further elaborate how Applying this method, the fault parameters of the 5.3-magnitude earthquake inversion are given. As a result, the fault is 62 ° N to the east, with a dip of 59 ° and a dip of 4.7 km. The upper boundary is 0.45 km deep and the lower boundary is 4.5 km deep. The slip distance is 73.4 mm and the strike slip is 25.5 mm, which is the normal-fault dextral strike-slip fault. The seismic moment m_0 = 2.0 × 10 ~ (24) dyne · cm, the stress drop σ = 12 bar, and the lower limit of strain energy released E = 1.2 × 10 ~ (19) erg. According to the results obtained, the paper discussed the source of earthquake in Xinfengjiang Reservoir with the seismic mechanism and tectonic data. It is pointed out that the regional stress field is the main force source and the hydraulic stress field is the main force source.