The paper studied the issue of low frequency in shallow parts of cross-hole seismic reflection sections using imaging principle and deduced frequency variation factor.
本文利用成像原理对井间地震反射剖面的浅部频率变低问题进行了研究，导出了频率变化因子。
Field experimental seismic sounding permitted us to obtain optimal shallow seismic reflection sounding parameters.
在现场实验探测的基础上，获得了最佳浅层地震反射探测参数。
The shallow seismic reflection prospecting have much advantages, therefore it has the wide applicating ranges in the shallow engineering geophysical prospecting.
浅层工程物探中，地震浅反勘探因其优点颇多而具广阔的应用范围。
The illustrated shallow seismic reflection method has achieved good results in detecting hidden caves. Some applied examples of engineering prospecting are enumerated in the paper.
文中的工程勘察实例说明，浅层地震反射法探测隐伏洞穴效果良好。
The variation of seismic velocity in shallow levels has important influence on velocity modelling and reflection imaging, which is confirmed by borehole data.
这一变化对建立地下速度模型及反射构造成象有较大影响，钻井资料证实了这一结果。
The shallow seismic reflection, as a primary physical prospecting method, is widely applied in engineering investigation.
浅层地震反射勘探作为工程勘察的一种主要物探手段，广泛应用于工程勘察中。
The shallow seismic reflection, as a primary physical prospecting method, is widely applied in engineering investigation.
浅层地震反射勘探作为工程勘察的一种主要物探手段，广泛应用于工程勘察中。
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