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Original text - English - seismic signals

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Category Science

Šis tulkojums pieprasa tikai nozīmi.
Title
seismic signals
Text to be translated
Submitted by arifejeo
Source language: English

Before it erupts, a volcano produces many thousands of earthquakes. Some of these happen when rock inside the volcano cracks or slips along a fault. Others are caused by magma (molten rock) and gases trying to move under pressure within channels and cracks.
Select from the links below to find out about the four primary types of volcano-related earthquakes and to see the seismic signals that they produce. (The movement of a signal from one peak to the next is equal to one cycle.)
4 May 2007 10:18