The unit is a horizontal beam seismograph that is designed to continuously record vertical changes in ground movement. The seismogram below is refreshed once every five minutes. The seismogram above ...

The term seismograph usually refers to the combined seismometer and recording device. The first known earthquake detector was invented in 132 A.D. by the Chinese astronomer and mathematician Chang ...

This seismogram shows a 24-hour record of how much the ground moves at Weston Observatory in Weston, Massachusetts. Viewing other seismic stations will show you how much the ground moves in those ...

Well, they even have the power to shake the ground in a manner that seismographs can record them. RELATED: Boat and ...

Like a seismograph recording an earthquake in trackless ocean depths, Radio Peking last week revealed a major upheaval in the government of Red China. In the greatest purge in four years ...

Some earthquakes are imperceptibly quiet. We may not feel them, but machines might detect them—and they can point scientists ...

Similar quakes in the region in the future, a seismologist warned, "could maybe focus energy toward population centers." ...

Some initially thought the seismic instruments recording the signal were broken ... they were scratching their heads about ...

So, virtually everything geologists know about Earth's deep structure is from seismographs, which record how seismic waves from earthquakes travel throughout the planet. "It's as if the only way of ...

By the use of the seismograph enemy gun batteries can be ... of delaying attacks by underestimated gun-fire, for it will record the positions where shells are exploding. It was while he was ...

The camera impatiently scurries from house to house in the small New England town, functioning as a kind of sexual seismograph, recording the slightest tremor. Most of them are very slight ...

After a mountaintop collapsed into the sea in Greenland, a 'mega-tsunami' as tall as a skyscraper shook the Earth for nine ...