Alberta,
15
January
2018
|
17:02
America/Denver

Detecting Earthquakes, Ice Quakes, and Everything in Between

AER’s extensive seismic monitoring system confirms “ice quake” west of Edmonton

In the late evening on January 1, residents of the village of Alberta Beach, about 70 kilometres west of Edmonton, may have felt some shaking that wasn’t the result of a New Year’s Eve party gone long.

Seismic monitoring station

Experts at the Alberta Geological Survey (AGS), a branch of the Alberta Energy Regulator (AER), confirmed two seismic events known as “ice quakes” caused by a rapid temperature change in the area. These quakes were the equivalent of a 2 magnitude (ML) seismic event.

The AER keeps tabs on all seismic activity across Alberta using the Regional Alberta Observatory for Earthquake Studies Network (RAVEN) stations—an extensive network of more than 50 monitors spread across the province. This is done in conjunction with networks operated by other research organizations: Natural Resources Canada, the University of Alberta, the Montana Bureau of Mines and Geology, the University of Western Ontario, and the University of Calgary.

At the heart of each station is the seismometer, a device that measures ground vibrations. These vibrations are recorded digitally and sent, in real time, to the AER, where the data is processed and analyzed. All of this information allows experts to detect and monitor earthquakes, including the suspected ice quake that struck near Alberta Beach.

AGS seismologist Ryan Schultz said these rare phenomena occur when there’s a significant temperature swing in a matter of hours. Most of Alberta was coming out of a long deep freeze on New Year’s Day.

The big temperature change caused ice to expand, creating popping sounds, ice heaves, and cracks in the ground’s surface.

“They don’t happen in Alberta every year, but they have happened before. A similar event happened near Calgary in 2014 and near Cold Lake in 2000. In 2016, there were also reports of an ice quake in Saskatchewan,” Schultz said.

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