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除了通常熟知的震源深度和介质吸收系数对烈度分布有较大影响外,震源的破裂方式(单侧或双侧),破裂速度的大小和方向,断层长度,断层面倾角和错动方式都对烈度分布有较大影响。尤其是破裂速度的大小和方向对烈度分布的影响更大。破裂速度大,而且方向向上,可使震中烈度增高一度多,极震区面积扩大1—2倍;反之,可使震中裂度降低一度、极震区面积减小许多。 根据震源参数对烈度分布影响的分析,可由历史地震的等震线反推其震源参数。 文中试行反推了三个历史地震的震源参数。
In addition to the commonly known focal depth and medium absorption coefficient have a greater impact on the intensity distribution, the source of the rupture mode (unilateral or bilateral), the size and direction of the rupture velocity, fault length, fault dip angle and the wrong way Intensity distribution has a greater impact. In particular, the magnitude and direction of the rupture velocity have a greater impact on the intensity distribution. The rupture speed is large and the direction is upward, which can increase the intensity of the epicenter more than once and enlarge the area of the epicenter 1-2 times. On the contrary, it can reduce the epicenter rupture for a while and the area of the epicenter can decrease a lot. According to the analysis of the influence of source parameters on the intensity distribution, the seismic source parameters can be deduced from the isoseismic lines of historical earthquakes. The paper tries to inverse the hypocenter parameters of three historical earthquakes.