Possible frost quake crack found in N.W. Calgary
Line 'likely' source of loud bang and shaking Tuesday, says U of C scientist
Geophysics students from the University of Calgary will head out tomorrow to investigate a large crack in the snow that could be the site of a possible frost quake — and the source of a mysterious booming noise and reports of the ground shaking Tuesday night.
"I had never heard of a frost quake until a couple of days ago when this mysterious event occurred in Calgary," says U of C's David Eaton.
Eaton says they are looking for a small crack in the ground that runs for tens to hundreds of metres.
Late Friday, a photo of just that was sent to CBC News and then forwarded to Eaton.
The photo shows a large crack in the ground in the area where the noise was heard, at Captain Nichola Goddard School in Panorama Hills.
Eaton and his team of students will head to the area Saturday morning to take measurements and investigate.
100 reports filed
Over 100 reports have been filed with Earthquakes Canada.
Residents who heard the boom were asked to fill out a survey explaining where they were when they felt it, their experience of it and the possible earthquake's effects.
The geophysics professor says that while a frost quake doesn't have the same destructive power, it is a type of earthquake.
“Most earthquakes represent a slip in a fault which is in the subsurface and the loading on that fault comes from tectonic forces. A frost quake is a tensile fracture at the surface of the earth and the driving force is temperature rather than tectonic forces.”