岩浆抬升，在火山内部累积以及被挤压到地层的破裂位置——这些事件都会在岩浆从地表露头之前引发化学信号。
The rise of magma, its accumulation in Chambers, its propulsion into fractures-these events produce chemical signals that reach the surface well ahead of the magma itself.
介绍了一种利用DDS技术设计的复杂结构信号模拟器，它可以模拟多种地层回声或复杂结构的信号。
A complex structure signal simulator designed by DDS technique is introduced. It can simulate several kinds of strata echo waves or complex structure signals.
低分辨率和高分辨率声波曲线实际上可以理解为幅度随地层深度或时间变化的信号或函数。
In fact, one can believe that the low resolution and high resolution sound wave curves are the signals or function which scope changes with the stratum depth and time.
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