1) first arrival
初至时
2) first breaks
初至时间
1.
To overcome the shortcomings of traditional static correction, a new method for static correction on ground surface by fitting the first breaks of direct waves using polynomial was put forward.
针对常规静校正方法的不足 ,提出了一种利用多项式拟合单炮记录初至时间作地表静校正的方法 。
2.
On the basis of method presented by predecessor that computing the time of first breaks at fourth point by eikonal equation when knowing the times of fi.
本文在前人提出的已知三点初至时间用程函方程求第四点初至时间的基础上,提出一种新的已知两点初至时间用程函方程求相邻第三点初至时间的计算方法,并将扩展波阵面法与局部算法综合应用,使算法更加稳健。
3) initial arriving moment
初至时刻
1.
When stress wave is used to inverse joint s attitude,the key problem is judge the initial arriving moment of reflected P-wave from the tested vibration signal.
节理产状应力波反演时,关键问题在根据测试振动信号判断出节理面反射纵波初至时刻。
2.
So we can judge the initial arriving moment for reflected wave through signal comparison.
在地表波动测试中,若不考虑上部岩层不均匀性,与发射点距离相等的测点上测得的振动信号理应吻合,而当某测点最先有节理面反射纵波传播至时,其振动信号就与其它测点振动信号发生偏离,故可通过信号对比判断出该测点处节理反射波初至时刻,该方法应用于实测信号,判断出的节理反射波初至时刻误差<1%。
4) first break time
初至时间
1.
Tomographic static correction technology of Greenmountain is a non-linear inversion method, which inverses the near surface velocity structure by means of first break time and ray path gained by ray-tracing method, calculates the stat.
绿山层析静校正是一种非线性反演技术,利用地震波初至时间和射线路径反演出近地表速度模型,然后求取静校正值,从而消除静校正影响,提高地震剖面的分辨率。
5) Moveout of first break time
初至时差
6) Seismic first arrivals time
地震初至时间
补充资料：观时至未至
【观时至未至】
谓如来将欲降生，先观众生可度之时至与未至。以度生时至，故现降生也。
谓如来将欲降生，先观众生可度之时至与未至。以度生时至，故现降生也。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。