Strong earthquake 7.4 on the Richter scale hit the Pacific Ocean 172 miles east off the coast of Atka, Alaska

Washington An earthquake measuring 7.4 on the Richter scale hit the Pacific Ocean 172 miles east off the coast of Atka, Alaska, United States (U.S.) on Thursday night so that a tsunami warning imposed in parts of coastal Alaska.The second earthquake measuring 7.2 Richter scale in the same area and at the same depth, which is about 40 km, occurred half a minute later, the agency said the United States Geological Survey (USGS). The quake occurred at 18:09 local time .

"Tsunami Warning daera now enforced in areas that include coastal areas of Alaska from Unimak Pass 130km northeast of Dutch Harbor until the Amchitka Pass, Alsaka ," Tsunami Warning Center said the West Coast and Alaska.This does not include the entire coast of Alaska peninsula and the rest of mainland Alaska.

Center was monitoring the tsunami risk is only on the west coast of North America from the Mexican border to Alaska.Tsunami warning means all coastal residents in the warning area near the coast or in low areas should be evacuated to places of higher and away from harbors and coves, including those dealing directly with the sea.Earthquakes in the magnitude as that normally cause a tsunami. If a tsunami happens, it will first waves hit Alaska at 20:12 local time

Earthquake Details

Magnitude

7.2

Date-Time

Friday, June 24, 2011 at 03:09:40 UTC

Thursday, June 23, 2011 at 06:09:40 PM at epicenter

Time of Earthquake in other Time Zones

Location

52.008°N, 171.859°W

Depth

62.6 km (38.9 miles)

Region

FOX ISLANDS, ALEUTIAN ISLANDS, ALASKA

Distances

64 km (39 miles) SW of Amukta Island, Alaska

103 km (64 miles) SW of Yunaska Island, Alaska

1677 km (1042 miles) WSW of Anchorage, Alaska

2429 km (1509 miles) W of WHITEHORSE, Yukon Territory, Canada

Location Uncertainty

horizontal +/- 13.8 km (8.6 miles); depth +/- 5.3 km (3.3 miles)

Parameters

NST=784, Nph=791, Dmin=231.5 km, Rmss=1 sec, Gp= 29°,

M-type=teleseismic moment magnitude (Mw), Version=A

Source

USGS NEIC (WDCS-D)