【摘要】 概述了双差定位方法及其基本原理,并运用该方法对1979～2009年澜沧—耿马地区发生的4279个中小地震进行精确定位,获得了4124个地震基本参数,走时残差均方根的平均值由定位前的0.502s降到了0.086s。定位结果显示震中沿北北西向的构造呈明显的条带状分布,且更加集中于断层附近,在深度上改变了定位前的层状分布现象,震源深度的优势分布为3～15km,表明该区的发震层较浅。虽然地表显示有部分段落不连续,但从深度剖面和震源机制等结果来看,该北北西向的断裂在地下可能是相通的。更多还原

【Abstract】 After outlining the double-difference earthquake location algorithm,we applied it to the accurate relocation of 4279 small-and medium-earthquakes occurred in Lancang and Gengma area in Yunnan Province from 1979 to 2009,and obtained the parameters of 4124 earthquakes.We found that the root mean square of the travel-time residuals reduced from 0.502 s to 0.086 s.The results displayed that the epicenters were stripedly distributed along the NNW-trend structure.The distribution the earthquake focuses were mainly distributed in the range of 3-15 km,which proves that the seismogenic layer in this area was relatively shallow.The original NNW-trend structure seemed discontinuous in the Earth’s surface,but judging from the depth profile and the focal mechanism,we thought that this structure may be linked together underground.更多还原