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对印尼地区3574次M≥5.0地震震源断层面上的海潮负荷应力进行计算,研究了地震断层上的负荷应力随深度变化以及随断层倾角和走向的变化特征.结果表明,地震断层上的负荷正应力大于负荷切应力.逆断层上的负荷应力最大,其它依次为斜滑断层、正断层和走滑断层.倾角范围在0°—50°的断层上的负荷正应力随倾角增大有减小趋势,负荷切应力在30°—50°倾角范围的断层上较大.负荷应力随断层走向的趋势性变化不明显.不同类型断层上的负荷正应力和切应力在震源深度15km处均达到最大,之后随深度增加而减小.当震源深度小于40km时,断层面上的海潮负荷应力的量级与固体潮应力相当.因此指出,在潮汐应力对地震影响的研究中,对震源深度小于40km的海洋和沿海地震,除固体潮汐应力外还需要考虑海潮负荷应力的影响.
The tidal load stress of 3574 M ≥ 5.0 earthquakes in Indonesia was calculated and the variation of load stress with depth and with the change of dip and strike of the fault was studied.The results show that the load on the fault The stress is greater than the load shear stress.The load stress on the reverse fault is the largest, followed by the ramp fault, the normal fault and the strike-slip fault.The positive stress on the fault with the dip angle 0 ° -50 ° decreases with the increase of the dip Trend and load shear stress are large in the range of 30 ° -50 ° inclination.The load stress does not change obviously with the trend of fault.The normal stress and shear stress on different types of faults reach the maximum at the depth of 15 km , And then decreases with depth.When the source depth is less than 40 km, the magnitude of the tidal load stress on the fault plane is comparable to that of solid tide stress.Therefore, it is pointed out that in the study of the impact of tidal stress on the earthquake, Of the ocean and coastal earthquakes, in addition to solid tidal stress also need to consider the impact of tidal load stress.