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晚第四纪期间大盆地地区发生了大规模的地表断层事件,断层长数十公里,包括一米多的位移,并且可能是地震断层(图1,2)。整个区域的断层分布很不均匀:各地方的断层形式既不相同,而且断层的发生在时间上的分布也不均匀。鉴别断层作用的型式,发生地点及大规模断层的重复率或重复率的变化,对于评价地震危险和为预报区内未来地震提供构造背景方面是极端重要的。正如岩石类型的分布以及重力和地磁资料所表明的那样,断层的某些型式看来与一些更为宽阔或更为综合的构造分区有关(图3)。
During the late Quaternary, a large-scale surface fault occurred in the Great Basin. The fault was several tens of kilometers in length, including a displacement of more than one meter, and could be an earthquake fault (Figures 1 and 2). The fault distribution in the whole area is very uneven: the fault patterns are not the same everywhere, and the faults are not evenly distributed in time. Identifying the type of fault, the location of occurrence and the change in repetition rate or repetition rate of a large-scale fault is extremely important for assessing the seismic hazard and providing a tectonic setting for future earthquakes in the prediction area. As the distribution of rock types and gravity and geomagnetic data show, some patterns of faults appear to be related to some of the broader or more complex tectonic zones (Figure 3).