ABC7

Earthquake scale: How they are measured and what the magnitude and intensity scales mean

Earthquakes and seismic activity often happen with sudden movements underground with tectonic plates. Seismographs are used by scientists to measure the time, location and strength of an earthquake.
The New York Times

Here’s How Earthquakes Are Measured

What does “moment magnitude” mean, and how do scientists determine the strength of a rupture in the earth? By Henry Fountain Henry Fountain spent a quarter century covering science for The Times. He ...
Morning Overview on MSN

A magnitude 4.6 earthquake rattled Hawaiʻi Island 21 miles deep on Tuesday evening, triggered by Pacific plate flexure under the island chain

Residents across Hawaiʻi Island felt the ground shake at 5:58 p.m. HST on June 2, 2026, when a magnitude-4.6 earthquake ...