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Alaska Peninsula unscathed after 8.2 quake - The Cordova Times thecordovatimes.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from thecordovatimes.com Daily Mail and Mail on Sunday newspapers.
More info Based on its magnitude, the fault that was active during the quake ruptured along a surface of approx. 10 km 2 (=4 sqare miles) as a first-order estimate. The length of the rupture zone thus was probably around 5 km (3 mi). Aftershocks typically occur during the days and weeks following the quake at or near the same fault, at distances of up to approx. two times the length of the rupture zone. The often broadly linear arrangement of aftershock epicenters encompasses the rupture zone of the main shock (check on the map below to verify). Recorded aftershocks, latest first (0 quakes so far, frequently updated): ....
Credit Courtesy of the Alaska Volcano Observatory Scientists have downgraded the alert level for an Aleutian volcano that began showing an increase in signs of eruption and emitting harmful ash late last week. According to Dave Schneider, a geophysicist with the Alaska Volcano Observatory, over the last several weeks, satellites and pressure sensor data revealed ramped up activity at Semisopochnoi Volcano, which is located on an uninhabited island in the Rat Islands about 600 miles southwest of Unalaska. Scientists detected steady ash emissions coming from the volcano Thursday, prompting them to upgrade the aviation color code to red and alert level to warning. ....
Semispochnoi Island volcanoes (Image: Wikipedia) A historic eruption was reported in 1873, and at least four others may have occurred in the previous hundred years, but documentation is scant. In December, geologists discovered that a trail of volcanic islands off the coast of the US state may actually be connected to one giant caldera. The cluster of six volcanoes in the Aleutian Islands – known as the Islands of the Four Mountains – may be connected to a much bigger underwater volcano. Scientists analysed seismic activity, gas emissions, gravity measurements and geochemistry in the region surrounding the six stratovolcanoes of Carlisle, Cleveland, Herbert, Kagamil, Tana and Uliag – and their results suggested activity could be traced to a bigger source. ....