Thus, the cables act as arrays of hundreds of seismometers. Now ... waves of seismic energy radiate outward from its hypocenter, an earthquake's point of origin underground.

There are a number of ways to measure the magnitude of an earthquake. Most scales are based on the amplitude of seismic waves recorded on seismometers. These scales account for the distance between ...

But he said the breakage in the February 2021 quake occurred in bedrock located south of the hypocenter. In the March 16 quake, the break in the bedrock was located north of the hypocenter.

Takashi Furumura, a professor at Tokyo University’s Earthquake Research Institute, said the Nov. 14 earthquake is classified as a “deep-focus earthquake” because its hypocenter was deep ...