A magnitude 7.8 earthquake shook the coast of Alaska

A magnitude 7.8 earthquake shook the coast of Alaska

A magnitude 7.8 earthquake shook the coast of Alaska, south of the Aliustan Islands, on Tuesday night (July 21), according to the U.S. Geological Survey.
The quake struck around 10 am. Local time (July 22 at 2:22 ET or 06:12 UTC) is about 65 miles southeast and 528 miles southwest of Periville, Alaska (anchor). The tsunami alert for southern Alaska, the Alaska Peninsula and the Aleutian Islands was later lifted.

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One block of the earth's crust at the bottom of the ocean occurred while sliding over another in a process called landslides. According to the USGS, the landslide occurred in or near a subduction zone where the Pacific plate beneath the tectonic plate of North America was slowly submerged (or abducted). Extreme events such as today's Alaska earthquake typically occur in an area 31 miles long (120 to 50 kilometers) that is 75 miles long.

The entire region is called the Alaska-Aleutia subduction zone, where earthquakes are relatively high. At least six other magnitude earthquakes have occurred 155 miles (250 km) since 1990. The largest of these, the 2.2 magnitude earthquake on November 19, 1937, came in the exact place of today's earthquake. The second largest timber recorded by modern seismic instruments in this subduction zone (but far from today's earthquake), occurred on March 2, 1964 with a magnitude of 9.2; The quake triggered a small tsunami, but its far-reaching effects did not affect people or infrastructure in the area.

Today's quake is considered shallow at a depth of about 17 miles (28 km). Kilometers are considered to be slightly shallower earthquakes below 0 km, former CNN meteorologist Alison Chincher said earlier. This is helpful because shallow earthquakes do the most damage regardless of their strength compared to depth.

.6..6 magnitude earthquakes, shallow and ground-breaking earthquakes, tsunamis can be caused by other types of earthquakes. Today's quake would be considered a shallow place, as cracks appeared at a depth of about 10 miles.

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