Researchers analyzed the data taken from seismographs of that region collected in 2011 and 2012 with a special focus being ... a surge in activity of deep long-period earthquakes at the beginning ...

said the Nov. 14 earthquake is classified as a “deep-focus earthquake” because its hypocenter was deep underground. It struck inside the Pacific Plate, which runs underneath near Japan.

A significant earthquake measuring M6.5 on the Richter scale occurred south of the Fiji Islands on April 13, 2025. This deep-seated tremor, reported by the United States Geological Survey (USGS) and ...