近场地震权重定位方法研究

摘要

通过轴对称映射,计算震中距定位权重,建立了权重定位方法.该方法充分考虑了台网中震中距长短不同的台站对定位贡献差异,计算的事件位置精度明显提高.该方法对台站或观测点的数量没有限制,对台网布局并不过于苛刻.特别是台网布局不合理时,盖革二乘与虚波速度法往往无法给出可靠的定位数据,而权重定位方法能够给出较好的结果.%Epicenter distance-weighing is calculated through the use of axis-symmetry image, and a location method of weighting-azimuth is established. This method takes into full account different contributions of various epicenter distances to seismic locations. Precision calculated by the weighted method is distinctly improved compared with other methods. This method does not have a limit on station numbers, and the requirement for the layout of the seismologic observation network is low. In the case of the unreasonable layout of seismic network when Geiger method and virtual wave method of velocity fail to provide reliable data, weighting-azimuth method can give better location results.