【摘要】 从历史地震来看,智利及其周边地区的历史强震主要集中在Nazca板块和南美洲板块之间的俯冲带上,该区也是7级以上大震频发的地区,所以对于该地区的断层结构和震源机制的研究就显得十分有必要。大地震发生后,大量余震在断层面上发生。因此余震震源位置的空间分布可以较为精确地勾画出断层面的位置。假定地震的发震断层可以用一个平面来模拟,且设大多数余震发生在这个平面断层的附近,则可以通过余震震源位置参数来求解发震断层的参数。本文主要是利用大震后震中附近会出现频繁的余震这个特点,利用模拟退火算法求出智利地区的主要断裂面并加以验证,并说明该地区的主要地质构造及地震成因。更多还原

【Abstract】 From a historical perspective,the earthquake in Chile and its surrounding areas are mainly concentrated in the historical earthquake Nazca plate subduction plates and South America plate.So the research of strong earthquakes in the areas of fault structure and focal mechanism is very necessary.After the earthquake,large aftershocks hit at fault surface.Therefore the spatial distribution of hypocenters aftershocks could more accurately delineate the fault location.Suppose the seismogenic faults can be simulated in a plane and most aftershocks hit the graphic fault nearby,the parameter of seismogenic fault can be acquired through the aftershock focal position parameter.There are frequent aftershocks near the epicenter of strong earthquakes.Based on the characteristics,the simulated annealing algorithm is used to figure out the main fault lines,geological structure and seismic causes.更多还原