本次4.9级地震作出的震源机制解显示为走滑型，与1969年主震的情况较为类似。
The focal mechanism of the M4.9 earthquake shows that it belongs to strike slip type that is similar to the M6.4 earthquake in 1969.
挤压型逆冲断层地震在主震之后，应力传播和释放过程比较缓慢，可能导致余震强度较大，持续时间较长。
Compressive faults occurred after principal earthquake with slow variation in propagation and release of stress wave, this might lead to higher after shock intensity and longer duration.
汶川地震的主震发生在具有右旋性质的仰冲型断层带上，震源深度为15公里左右。
The main shock occurred on the dextral obduction-type fault zone and the hypocenter depth was about 15km .
地震序列类型为前震—主震—余震型；
地震序列类型为前震—主震—余震型；
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