沿断裂带滑动速率具明显的非均匀性特点，表现为自东向西水平位移具累积滑动亏损特征，垂直位移则具补偿性。
The horizontal displacement has cumulative slip deficit from east to west, while the vertical displacement has the nature of compensation.
此类地震在构造的压力长年累积、板块突然滑动时发生。
Such quakes occur after tectonic stresses build up for years and the plates abruptly slip.
采用滑动时间窗口生成块运动方向时间序列，在此时间序列的基础上计算块的累积量和主运动方向。
And a time sequence of motion orientation for each block is generated over a sliding time window. Then accumulation and main motion orientation are computed according to the sequence.
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