Magnitude 7.5 quake in northern Japan injures 23 people and triggers a tsunami

A powerful 7.5-magnitude earthquake has struck off northern Japan, injuring over 20 people and triggering a tsunami

Alaska Rocked by Magnitude 7 Earthquake: What to Know

The quake came during a cluster that saw over a dozen other earthquakes reported over a 24-hour period, the USGS map shows.

Magnitude 7 earthquake rocks Alaska, more than 20 aftershocks felt

A magnitude 7 earthquake has rocked Alaska on Saturday, Dec. 6, according to the United States Geological Survey (USGS).

6.7 magnitude quake strikes off northern Japan's coast, prompts local tsunami warning

A 6.7 magnitude earthquake occurred Friday afternoon local time off the northern coast of Japan, the Japan Meteorological Agency said. The earthquake comes after a 7.5 magnitude earthquake struck the same region earlier this week.

Japan issues tsunami advisory after 6.7-magnitude quake in country's northeast

The quake, which occurred off the coast of Aomori prefecture, followed a 7.5-magnitude earthquake this week that injured at least 34 people.

Map: 7.0-Magnitude Earthquake Shakes Alaska

A major, 7.0-magnitude earthquake struck near the Alaska-Canada border on Saturday, according to the United States Geological Survey. The temblor happened at 11:41 a.m. Alaska time about 56 miles north of Yakutat, Alaska, data from the agency shows. U.S.G.S. data earlier reported that the magnitude was 6.7.
ABC7 San Francisco

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. Magnitude illustrates the strength of an earthquake ...
Los Angeles Times

Here’s what earthquake magnitudes mean—and why an 8 can be so much scarier than a 6

We know an earthquake is severe when it has a high magnitude number. The 1985 quake that devastated Mexico City was an 8. The quake that shook central Mexico this week was a 7.1. But what exactly is magnitude? Basically, magnitude is a number representing ...
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