People on clay soils, such as in West Anchorage, experience a longer, jiggling motion. People in homes on solid bedrock experience the shaking more quickly, as abrupt jerking. People farther from the epicenter could have experienced the quake longer, because the difference between different types of waves lengthens.Ī bigger factor are the varying types of material beneath Southcentral Alaska, geologists said. The different arrival times are also one reason why some felt Friday’s quake lasted different lengths of time. The difference between the waves are like thunder and lightning - geologists can estimate an earthquake’s location by measuring the difference in arrival time between the types of waves, Haeussler said.
“That’s the big shake,” when there’s suddenly violent jolting that leaves no doubt a quake is underway, Haeussler said. The secondary waves come after, and should have reached Anchorage in about 13 seconds, Hayes said. history, centered about 75 miles (120 kilometers) east of Anchorage. NovemA powerful 7.0 magnitude earthquake struck Anchorage, Alaska on Friday (November 30) morning at 8:29 a.m local time. When they arrive, people might hear something like a loud truck rumbling up the street. On March 27, 1964, Alaska was hit by a magnitude 9.2 earthquake, the strongest recorded in U.S. On Friday, the first waves of energy issued by the earthquake would have reached Anchorage in about seven seconds, in the form of primary waves, Hayes said. The notable quake was recorded about 12 miles south of the city and about. That’s a fraction of the rupture during the massive 1964 quake, which extended 500 miles and was much shallower, he said.Īnchorage residents felt that quake for four minutes - much longer than Friday’s motion - in part because the ’64 rupture released energy across a sprawling area, from Prince William Sound to Kodiak. A mild earthquake struck in Anchorage, Alaska on Monday morning, according to the United States Geological Survey.
The rupture stretched about about 19 miles. According to the USGS, this powerful quake initially coming in as a magnitude 6.6, but quickly upgraded to a 7.0 struck just 13 kilometres (about 8 miles) north of Anchorage at a depth of. That plate is being yanked beneath the southern part of Alaska. The rupture occurred as a giant slab of crust some 30 miles below the ground was being pulled apart like a Snickers bar, said Peter Haeussler, a USGS research geologist in Anchorage.
0 kommentar(er)
