How Often do Earthquakes Occur?

How often do earthquakes occur?

To most people’s surprise, significant worldwide earthquake activity happens at a phenomenal rate. The number of worldwide earthquakes registering M4.0 or stronger ranges between 100 – 500 events per week; activity in the M5+ range happens between 5 – 70 times per week; and it is unusual when a M6+ quake does not happen somewhere on the planet during a week.

Substantial microseismicity happens at a regional level as well. Obviously, California and Alaska are areas in the United States with the highest microseismicity, but other regions also show a surprising number of earthquakes. Even the East Coast, an area where most people would consider as seismically quiet, is the site of a half dozen to a couple dozen events each week – albeit there are small, yet they do occur.