An 7.8-magnitude earthquake hits off the coast of Alaska

The U.S. Geological Survey reported that a powerful 7.8-magnitude earthquake struck off the coast of Alaska, in the south of the Aleutan Islands, on Tuesday evening (21 July) local time, raising fears of a tsunami.

The earthquake struck 10:12 pm local time (2:12 am ET on July 22, or 06:12 UTC) just 65 miles (105 km) southeast of Perryville, Alaska, and 528 miles southwest of Anchorage. The tsunami warning issued in southern Alaska, Alaska Peninsula and the Aleutia Islands was subsequently canceled.

Related: 10 Tsunami Waves Changed History

Vibration occurred when a mass of Earth’s crust slipped on the sea floor on top of another, in a process called cracking thrust. In this case, a slip occurred on or near the subduction zone where the Pacific plate slowly sinks beneath (or transforms) the tectonic plate in North America, according to the US Geological Survey. The US Geological Survey said that pessimistic events similar to the Alaska earthquake today usually occur in an area 75 miles long and 31 miles wide (120 x 50 km).

The entire region is called the Alaskan Alaskan subduction zone, where earthquakes are relatively common. Since 1900, another six earthquakes have struck at least 7 with a magnitude of 155 miles (250 km) from today’s event. The U.S. Geological Survey said the largest, an 8.2-magnitude earthquake, struck on November 10, 1938, at roughly the same location as today’s earthquake. The second largest earthquake recorded with modern seismic instruments occurred in the subduction zone (but far from today’s earthquake), causing a 9.2 magnitude earthquake on March 27, 1964; The US Geological Survey said this earthquake produced small tsunamis, but its remote location means that there has been little impact on people or infrastructure in the area.

Today’s earthquake is shallow at a depth of about 17 miles (28 km). “Anything less than 70 km is considered a shallow earthquake,” said Alison Chinchar, a meteorologist at CNN earlier. “This is important, because shallow earthquakes often cause the most damage, compared to deeper earthquakes, regardless of their strength.”

According to the U.S. Geological Survey, earthquakes with a magnitude greater than 7.6 that are also shallow and caused by propulsion failure are more likely than other types of earthquakes to trigger a tsunami. Today’s earthquake will be considered a shallow earthquake, with the rupture occurring with a depth of about 6 miles (10 km).

Originally Posted on Live Science.

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