and there were no shocks such as usually accompany earthquakes. It was an easy swing, which produced dizziness and nausea. As recorded by bracket seismographs this continued for ten or twelve minutes.
called seismometers, spread across the world. Those instruments record the waves of shaking from the quake’s point of origin moving through the earth. Worldwide, the frequency of earthquakes has ...
WELLINGTON, Dec. 4 (Xinhua) -- New Zealand scientists called for increased seismometer coverage to prepare for the next big earthquake, according to a study released on Wednesday. Monitoring of ...