Paragenesis of deep earthquakes and volcanos in Huichun and inland seismic ray
珲春深震火山共生与内陆地震线
The seismic ray tracing method is used to get the theoretical time according to the location and original velocity of each gridding point.
基于初始的每个网格点的位置和速度，通过地震射线追踪方法正演得到理论走时。
A new seismic ray-tracing method was put forward based on parabolic travel-time interpolation ( PTI) method, which is more accurate than the linear travel-time interpolation ( LTI) method.
提出一种对旅行时进行抛物线插值的地震射线追踪方法（简称PTI方法），它比基于旅行时线性插值方法（简称LTI方法）计算结果更准确。
Based on the location results the off-source angle of seismic ray was calculated, the direction distribution was plotted on SCHMIDT net by observed P wave onset directions, and the nodal plane was suggested.
根据定位结果，计算了地震射线的离源角，用观测到的P波初动方向资料在SCHMIDT网上绘制了方向分布图，作出了一组节面。
The nonlinear effect of transmitted rays is presented based on Snell'slaw. It is theoretically proved that when a seismic ray trajectory is a straight line on an interface it may be a curve on another interface.
根据Snell定律提出了透射射线的非线性效应的概念，从理论上证明了当地震射线的轨迹在1个界面上为1条直线时在另1个界面上可为1条曲线；
