An urgent tsunami alert has been issued for Papua New Guinea after an earthquake measuring 6.9 on the Richter scale - the US Geological Survey warned of large three-metre waves ...

At 5:36 p.m. on March 27, 1964, a massive earthquake struck Alaska. According to the U.S. Geological Survey, the earthquake registered 9.2 on the Richter scale and lasted fourand-a-half minutes. This ...

At 5:36 p.m. on March 27, 1964, a massive earthquake struck Alaska. According to the U.S. Geological Survey, the earthquake registered 9.2 on the Richter scale and lasted fourand-a-half minutes.

The Andreanof Islands earthquake in Alaska, US, took place on March 9, 1957. The intensity was measured at 8.6 on the Richter scale. This earthquake triggered a tsunami that was felt in Hawaii ...

How the strength of quakes is measured has changed over the years, so you'll see references to the Richter Scale, earthquake magnitude and intensity.

Most commonly, scientists refer to an earthquake's magnitude as a measure of its strength. Geologists once used the Richter scale, but that measure is considered outdated and is no longer used.

A USGS Modified Mercalli Intensity map shows contours of equal shaking for the 1964 Alaska earthquake. On the right, the same contours are superimposed on California at the same scale. (Contributed) ...

The earthquake that took place in 1964 on March 28 in the Alaska region hit with a strong magnitude of 9.2 as per the Richter scale.

Discover the biggest earthquake to ever shake Alaska. Find out where it hit, when it struck the state, and the damage it caused!