So, a magnitude 8.7 is 794 times bigger than a 5.8 quake as measured on seismograms, but the 8.7 quake is about 23,000 times STRONGER than the 5.8 Since it is really the energy or strength that knocks down buildings, this is. Both were subduction events caused by the tectonic plate under the Pacific Ocean going underneath Alaska, she said. The magnitude scale is really measuring the physical size of the earthquake, not the STRENGTH (energy) of the quakes. The earthquake’s source was similar to the 7.1 magnitude earthquake that caused damage throughout the Anchorage and Mat-Su areas in 2018, said Heather McFarlin, the seismic data manager at the earthquake center. There was no tsunami danger from the earthquake, according to the National Tsunami Warning Center. The very strong quake was located about 56 miles (91. There were no immediate reports of damage. The 8.2 magnitude earthquake that struck off Alaska’s coast Wednesday night was the strongest one since 1964, an official told CNN. throughout a large portion of Southcentral Alaska, including on the Kenai Peninsula and north toward Talkeetna. The earthquake was centered near Eagle River, about 12 miles northeast of Anchorage, with a depth of 17.5 miles, according to the Alaska Earthquake Center. (USGS)Ī 4.6 magnitude earthquake shook the Anchorage area early Monday. A major magntiude-7.1 earthquake struck southern Alaska early Sunday morning, leaving scattered power outages and some damage in its wake. The epicenter of Monday's 4.6 earthquake near Eagle River.
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