Alaska's Aleutian islands rocked by second quakeA second earthquake in less than 24 hours shook Alaska's desolate Aleutian Islands Aleutian Islands (əl`shən), chain of rugged, volcanic islands curving c.1,200 mi (1,900 km) west from the tip of the Alaska Peninsula and approaching Russia's Komandorski Islands. Tuesday measuring a magnitude of 6.3, US seismologists said.
The quake hit some 75 miles (120 kilometers) from Nikolski off the coast at a depth of some 8.5 miles (13.7 kilometers) at 12:21 pm Tuesday (2021 GMT (Greenwich Mean Time) See UTC.
GMT - Universal Time 1 ), the US Geological Survey reported.
It came after a 6.2-magnitude earthquake struck the islands late Monday at 9:37 pm (0537 GMT Tuesday) about 91 kilometers (57 miles) southwest of Unalaska, a town of about 4,000 people, according to the USGS USGS United States Geological Survey (US Department of the Interior) .
A message from the West Coast and Alaska Tsunami warning center said the second quake was not expected to trigger a tsunami.
"However, in coastal areas of intense shaking, locally generated tsunamis can be triggered by underwater landslides," the center added in a statement.
There were no immediate reports of injuries or damage. The chain of about 300 small islands with dozens of volcanoes sits on the Pacific ring of fire “The Ring of Fire” redirects here. For other uses, see Ring of Fire.
The Pacific Ring of Fire is an area of frequent earthquakes and volcanic eruptions encircling the basin of the Pacific Ocean. and is often subjected to seismic activity.
The readings were based on the open-ended Moment Magnitude scale Noun 1. moment magnitude scale - a logarithmic scale of 1 to 10 (a successor to the Richter scale) that enables seismologists to compare the energy released by different earthquakes on the basis of the area of the geological fault that ruptured in the quake , now used by US seismologists, which measures the area of the fault that ruptured and the total energy released.