What are earthquakes ? Why do they occur ?
and Why can't we predict them ?
Although we still can't predict when an earthquake will happen, we have learned much about earthquakes as well as the Earth itself from studying them. We have learned how to pinpoint the locations of earthquakes, how to accurately measure their sizes, and how to build flexible structures that can withstand the strong shaking produced by earthquakes and protect our loved ones.
An earthquake is a sudden shaking of the ground. They generate seismic waves which can be recorded on a sensitive instrument called a seismograph.
Earthquakes generate seismic waves which can be detected with a sensitive instrument called a seismograph.
Advances in seismograph technology have increased our understanding of both earthquakes and the Earth itself.