Alaska has been shaken by a 6.8 magnitude earthquake around 6:55 a.m. EDT (1055 GMT) Friday morning which prompted a brief tsunami warning for Alaska’s Aleutian Islands and the coastal areas in Alaska.

The warning was cancelled after an hour because only a small wave was recorded in the community of Atka in the Western part of Alaska and it did not develop into a tsunami.

The preliminary measurement of the Alaska Earthquake on Friday was 7.1 but the US Geological Survey (USGS) later put the official size at 6.8.

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Meanwhile, the 1964 Alaska earthquake, also known as the Great Alaskan Earthquake, the Portage Earthquake and the Good Friday Earthquake, was the strongest recorded earthquake in US history. It’s megathrust earthquake that began at around 5:36 P.M. AST on Good Friday , March 27, 1964. Across south-central Alaska, ground fissures, collapsing buildings, and tsunamis resulting from the earthquake caused about 131 deaths.

Lasting nearly four minutes, it was the most powerful recorded earthquake in U.S. and North America in history, and the second most powerful ever measured by seismograph. It had a magnitude of 9.2, at the time making it the second largest earthquake in the world for all time.

The powerful earthquake produced earthquake liquefaction in the region. Ground fissures and failures caused major structural damage in several communities, much damage to property and several landslides. Anchorage sustained great destruction or damage to many inadequately engineered houses, buildings, and infrastructure (paved streets, sidewalks, water and sewer mains, electrical systems, and other man-made equipment), particularly in the several landslide zones along Knik Arm. Two hundred miles southwest, some areas near Kodiak were permanently raised by 30 feet (9.1 m). Southeast of Anchorage, areas around the head of Turnagain Arm near Girdwood and Portage dropped as much as 8 feet (2.4 m), requiring reconstruction and fill to raise the Seward Highway above the new high tide mark.

Meanwhile, a new earthquake struck Alaska early Friday morning of September 2, 2011. The strong subsea 6.8 magnitude earthquake was recorded near the Fox Islands of Alaska.

According to United States Geological Survey (USGS), the earthquake struck at a depth of 35.5 km. Its epicenter was located 45 km (27 miles) SW of Amukta Island, Alaska; 85 km (52 miles) SW of Yunaska Island, Alaska; 1658 km (1030 miles) WSW of Anchorage, Alaska; and 2410 km (1497 miles) W of Whitehorse, Yukon Territory, Canada.

No casualties, damage or injuries were reported after the recent Alaska earthquake.

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