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Measurement of Idaho Earthquake on March 31 2020

Updated: Jul 30, 2020

A 6.5 magnitude Idaho earthquake was felt in Calgary on March 31, 2020

A 6.5 magnitude Idaho earthquake was felt in Calgary on March 31, 2020

Calgary, a prairie city far from any nearby fault lines, felt an unfamiliar sensation early Tuesday evening — an earthquake.

A 6.5 magnitude quake occurred at a depth of 10 kilometres near Challis, Idaho, at 5:52 p.m. MT, and was felt in Calgary just a few minutes later.
The epicenter of the quake was nearly 700 kilometres southwest of Calgary…

The Idaho earthquake data was coincidentally captured by Symroc UBB broadband Systems in NE Calgary, through a new IOT remote sensing system.

Arrival time in NE Calgary was 17:54:44.177. Using the reported event time of 17:52:00, the P-wave took 2 minutes and 44.177 seconds to arrive at the sensor location in Calgary.

P-Wave and S-Wave arrival time difference is 86.568 seconds.

PGV (vertical) velocity is measured as 0.44868cm/s,PGV (horizontal north-south) is 0.75558 cm/s.

Frequency spectrum analysis

Frequency spectrum analysis in Logarithmic Scale

It was pure serendipity that Symroc recorded this event. We are in the process of delivering a number of sensors to the Federal government and left one powered up overnight on a window ledge. If we use a rough multiplier of 8.1 (5 in miles) for the time difference between the P and S waves we get a distance of 701 km to the epicentre of the earthquake in Idaho. Pretty amazing!

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