2021-02-24 22:38:33 (M3.1) Quarry blast Eastern Montana 45.8 -106.7 (90be5)

M3.1 Quarry blast - Eastern Montana

Preliminary Report

Magnitude	3.1
Date-Time	24 Feb 2021 22:38:33 UTC 24 Feb 2021 15:38:33 near epicenter 24 Feb 2021 14:38:33 standard time in your timezone
Location	45.818N 106.696W
Depth	-2 km
Distances	9.2 km (5.7 mi) SW of Colstrip, Montana 115.3 km (71.5 mi) N of Sheridan, Wyoming 140.4 km (87.0 mi) E of Billings, Montana 194.0 km (120.3 mi) NNW of Gillette, Wyoming 421.0 km (261.0 mi) ESE of Helena, Montana
Location Uncertainty	Horizontal: 1.0 km; Vertical 31.6 km
Parameters	Nph = 9; Dmin = 103.4 km; Rmss = 0.28 seconds; Gp = 115° Version = 3
Event ID	mb 80488919

For updates, maps, and technical information
see: Event Page or USGS Earthquake Hazards Program
Montana Regional Seismic Network
Montana Bureau of Mines and Geology
http://mbmgquake.mtech.edu


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