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1997年翁布里亚—马尔凯地震序列期间进行的野外测量,发现了与3次最大地震(M_w≥5.7)有关的地面和路面上产生的破裂。破裂集中发生在几个狭长的条带上,这些条带部分处于或邻近原来标绘出的大倾角的正断层。地面形变的几何形态与主震的矩心矩张量震源机制解所得出的北东走向的延长线是一致的。余震的分布表明,3个主震发生在南西向倾斜约40°的正断层上。地质调查、预期的同震高程变化模拟以及地震资料都表明;地面形变并不是深处的断层起始破裂直接造成的。
Field surveys conducted during the Umbria-Marche earthquake sequence in 1997 found cracks on the ground and the road surface associated with the three largest earthquakes (M_w ≥ 5.7). The ruptures occurred concentrated on several narrow strips that were at or near the normal, large dip normal fault. The geometry of the ground deformation is consistent with the extension of the NE strike derived by the solution of the focal mechanism of the centroid moment tensor of the main shock. The distribution of aftershocks indicates that the three main earthquakes occurred on the normal fault inclined about 40 ° in the southwest direction. Geological surveys, simulations of expected coseismic elevation changes, and seismic data suggest that ground deformation is not a direct result of the initial rupture of faults in the depths.