Earthquakes in the Nenana Basin in Interior Alaska last longer and feel much stronger than quakes of comparable magnitude in other places. It’s all about the reverberation, UAF researchers find.
Below the beautiful lakes and swamps in the Minto Flats region is a giant bowl, and it’s filled with gravel. UAF Geophysical Institute seismology professor Carl Tape said to imagine the flat surface of the land like the surface of the ocean, and if you removed the water, you’d see interesting things revealed.
“That area has not been really studied that much,” said Smith. “And we wanted to know how the basin moved, because people want to do a lot of projects in that region. So it’s good to know what happens when there’s a big earthquake.” The basin west of Nenana and south of Minto is 56 miles long and 7.5 miles wide. It was filled in over millions of years with sediment brought by the rivers from the Alaska Range. Smith said it could be the deepest such basin in Alaska.That is deeper than Denali is high.
“The ridge between Nenana and Fairbanks, when you drive along that, you’re high up on pretty close to rock. The ground moves very differently in that kind of material than it does down in Minto Flats.”
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