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.
原始的地点或位置。如未经断层或滑坡扰动过的大片露头区。
In the original location or position, such as a large outcrop that has not been disturbed by faults or landslides.
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