When do we use a seismograph?

Sometimes there is a big news story about an earthquake that happened in some distant part of the world. Although people living in that area didn’t feel the earth shake, scientists probably made a complete and exact have special instruments called seismology. The seismograph picks up the one rock mass rubbing against the other. The energy of this rubbing is changed to vibration in the rocks. This vibration can travel many thousands of miles.

Fact File:

The edges of the Pacific plate are surrounded by earthquakes, volcanic activity and hot springs, caused by the crust shifts and hot lava rises near the surface.


Picture Credit : Google