They found that the seismic waves get amplified as they bounce back and forth off the sides and bottom of the sedimentary basin in the Minto Flats region. So people in the flats perceive the earthquakes as bigger than they actually are.
University of Alaska Fairbanks Ph. D. student Kyle Smith services a seismic sensor in 2018 on the bank of the Tanana River in the Minto Flats area.
Tape worked with graduate student Kyle Smith, placing 13 seismic monitors across the area over four years, from 2015 to 2019. In that time, they collected data from 48 local and regional earthquakes. The monitors, the first seismic stations installed in Minto Flats, are part of the Fault Locations and Alaska Tectonics from Seismicity project funded by the National Science Foundation.
University of Alaska Fairbanks Ph. D. student Kyle Smith installs a seismic sensor in 2015 in the Minto Flats area. The seismic monitors recorded earthquakes lasting longer on the gravel-filled basin than on harder ground. Both Tape and Smith noted the measured difference between the Nenana Ridge under the Parks Highway, and the flats below.
“The shaking is like 10 times less compared to if you were just downhill from that. So it’s pretty amazing how stark the difference is caused by whatever the underlying geology is,” Smith said.Tape said many UAF scientists are targeting the basin for research.
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