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How Often Do Earthquakes Occur? Has There Been An Uptick In Seismic Activity Worldwide?

4,098 views · Published 16 November 2017 · 3:55 · Indexed 22 September 2026

Channel: Oppenheimer Ranch Project · 2017 · People & Blogs

How Often Do Earthquakes Occur?

Earth is an active place and earthquakes are always happening somewhere. In fact, the National Earthquake Information Center locates about 12,000-14,000 earthquakes each year! This fact sheet illustrates information on the frequency of earthquakes of various magnitudes, along with details on the effects of earthquakes and the equivalent energy release. On average, Magnitude 2 and smaller earthquakes occur several hundred times a day world wide. Major earthquakes, greater than magnitude 7, happen more than once per month. "Great earthquakes", magnitude 8 and higher, occur about once a year.

Keypoints:
Earthquakes are always happening somewhere.
For each step up in magnitude the annual number of earthquakes decreases (roughly) by a factor of 10.
For each step up in magnitude an earthquake releases 30 times more energy.
While the number of earthquakes that can be detected and located each year has been increasing, this doesn’t mean that the annual average number of earthquakes has increased.
However, based on recent data there appears to be a marked increase above baseline in recent months.
https://www.iris.edu/hq/inclass/fact-sheet/how_often_do_earthquakes_occur

https://www.usgs.gov/faqs/which-country-has-most-earthquakes?qt-news_science_products=7#qt-news_science_products

https://earthquake.usgs.gov/learn/facts.php

http://www.climate4you.com/images/70-90N%20MonthlyAnomaly%20Since1920.gif

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How Often Do Earthquakes Occur? Has There Been An Uptick In Seismic Activity Worldwide?

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