Earthquakes of the 20th Century

 8.8 — Ecuador — 31 January 1906
8.4 — Kamchatka, Russia — 3 February 1923
8.4 — Sanriku, Japan — 2 March 1933
8.6 — Unimak Island, Aleutian Islands — 1 April 1946
9.0 — Kamchatka, Russia — 4 November 1952
8.6 — Andreanof Islands, Aleutian Islands — 9 March 1957
9.5 — Valdivia, Chile — 22 May 1960
9.2 — Prince William Sound, Alaska — 28 March 1964
8.7 — Rat Islands, Aleutian Islands — 4 February 1965

 

From NOAA

This animation shows every recorded earthquake in sequence as they occurred from January 1, 1901, through December 31, 2000, at a rate of 1 year per second.
The earthquake hypocenters first appear as flashes then remain as colored circles before shrinking with time so as not to obscure subsequent earthquakes.
The size of the circle represents the earthquake magnitude while the color represents its depth within the earth.
At the end of the animation it will first show all quakes in this 100-year period.
Next, it will show only those earthquakes greater than magnitude 6.5, the smallest earthquake size known to make a tsunami.
It will then show only those earthquakes with magnitudes of 8.0 or larger, the "great" earthquakes most likely to pose a tsunami threat when they occur under the ocean or near a coastline and when they are shallow within the earth (less than 100 km or 60 mi.
deep).
The animation concludes by showing the plate boundary faults responsible for the majority of all of these earthquakes.

This other animated map makes use of USGS data to map earthquake events with a magnitude of 6.0 and greater from 1900 to November 2019.

The depths of the earthquakes have been exaggerated so we can actually see the relative depths of these events.

This map also highlights several key earthquakes in the last 120 years, including the 1906 San Francisco (M7.9) earthquake, the Great Chilean Earthquake (M9.5) of 1960, and the more recent event that rocked Haiti (M7.1) in 2010.

source ESRI

The era of modern earthquake seismology—the scientific study of earthquakes—began in the 20th Century with the invention of the seismometer and its deployment in instrument networks to record and measure earthquakes as they occur.
Therefore, when the animation begins only the largest earthquakes appear as they were the only ones that could be detected at great distances with the few available instruments available at the time.
But as time progresses, more and more seismometers were deployed and smaller and smaller earthquakes could be recorded.
For example, note how in the 1930’s many small earthquakes suddenly seem to appear in California, but this illusion results from the installation of more and more instruments in that region.
Likewise, there appears to be a jump in the number of earthquakes globally in the 1970's when seismology took another leap forward with advances in telecommunications and signal processing with digital computers, a trend that continues today.

20th Century seismology revealed the global geographic distribution of earthquakes and helped to solidify the Theory of Plate Tectonics.
Notice how earthquake epicenters do not occur randomly in space but form patterns over the earth’s surface, revealing the boundaries between tectonic plates as shown toward the end of this animation.
This time period also includes some remarkable events, including those that generated devastating tsunamis:

These earthquakes represent some of the largest ever recorded.
Note how they all occur at a particular type of plate boundary, subduction zones where tectonic plates collide, so these are the regions where we expect future devastating tsunamis to be generated.