Minor mag. 3.1 earthquake - 78 mi northeast of Boise, Ada County, Idaho, on Friday, 20 Nov 1.28 pm (GMT -7) -

Minor mag. 3.1 earthquake  - 78 mi northeast of Boise, Ada County, Idaho, on Friday, 20 Nov 1.28 pm (GMT -7)

Minor magnitude 3.1 earthquake at 6 km depth

20 Nov 20:46 UTC: First to report: USGS after 19 minutes.
20 Nov 22:06: Magnitude recalculated from 3.5 to 3.1. Hypocenter depth recalculated from 6.9 to 6.3 km (from 4.3 to 3.9 mi). Epicenter location corrected by 1.2 km (0.8 mi) towards NE.
Update Fri, 20 Nov 2020, 20:51
Small 3.5 quake hits near Challis, Idaho
3.5 quake 20 Nov 1:28 pm (GMT -7)
3.5 quake 20 Nov 1:28 pm (GMT -7)
The United States Geological Survey (USGS) reported a magnitude 3.5 quake in the Idaho near the town of Challis only 23 minutes ago. The earthquake hit around noon on Friday 20 November 2020 at 1.28 pm local time at a very shallow depth of 4.3 miles. The exact magnitude, epicenter, and depth of the quake might be revised within the next few hours or minutes as seismologists review data and refine their calculations, or as other agencies issue their report.
A second report was later issued by the European-Mediterranean Seismological Centre (EMSC), which listed it as a magnitude 3.5 earthquake as well.
Despite its relatively small magnitude, the quake could probably be felt very close to the epicenter. Towns or cities near the epicenter where the quake might have been felt as very weak shaking include Challis (pop. 1000) located 41 miles from the epicenter.
If you were or still are in this area during the quake help others with your feedback and file a quick report here.
Download the Volcanoes & Earthquakes app to get one of the fastest seismic alerts online:
Android | IOS

Earthquake data:

I felt this quake
I didn't feel it
Date & time: 20 Nov 2020 08:28:01 UTC -
Local time at epicenter: Friday, 20 Nov 1.28 pm (GMT -7)
Magnitude: 3.1
Depth: 6.3 km
Epicenter latitude / longitude: 44.3477°N / 115.0234°W (Idaho, United States)
Nearest volcano: Shoshone (140 km / 87 mi)
Nearby towns and cities:
16 km (10 mi) NW of Stanley (Custer County) (pop: 68)
65 km (41 mi) SW of Challis (Custer County) (pop: 1,040)
91 km (57 mi) NW of Ketchum (Blaine County) (pop: 2,730)
108 km (67 mi) NW of Hailey (Blaine County) (pop: 8,130)
125 km (78 mi) NE of Boise (Ada County) (pop: 146,000)
137 km (85 mi) NE of Meridian (Ada County) (pop: 90,700)
153 km (95 mi) NE of Nampa (Canyon County) (pop: 89,800)
153 km (95 mi) NE of Caldwell (Canyon County) (pop: 51,700)
Weather at epicenter at time of quake:
Clear Sky -8°C (18 F), humidity: 72%, wind: 2 m/s (3 kts) from NNW
Primary data source: USGS
Estimated released energy: 2.8 x 109 joules (783 kilowatt hours, equivalent to 0.674 tons of TNT) [learn more]
[smaller] [bigger]
If you felt this quake (or if you were near the epicenter), please share your experience and submit a short "I felt it" report! Other users would love to hear about it!
Also if you did NOT feel the quake although you were in the area, please report it! Your contribution is valuable also to earthquake science and earthquake hazard analysis and mitigation efforts. You can use your device location or the map to indicate where you were during the earthquake. Thank you!

Data for the same earthquake reported by different agencies

Info: The more agencies report about the same quake and post similar data, the more confidence you can have in the data. It takes normally up to a few hours until earthquake parameters are calculated with near-optimum precision.
M 3.16.3 km15 Km NNW of Stanley, Idaho, USAUSGS

User reports for this quake (1)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
Boise (7.8 km SSW of epicenter) [Map] / Very weak shaking (MMI II)
Volcanoes & Earthquakes - new app for Android

Earlier earthquakes in the same area

Minor mag. 3.1 earthquake - 78 mi northeast of Boise, Ada County, Idaho, on Friday, 20 Nov 1.28 pm (GMT -7)
Volcanoes & Earthquakes - new app for Android

More on VolcanoDiscovery

Why is there advertising on this site?

Support us!

Maintaining the website and our free apps is a time- and cost-intensive effort.
If you find the information useful and would like to support our team to develop further features and get the upgraded ad-free version, consider making a donation (PayPal or Online cc payment).
Planned features:
  • Weather reports
  • Tsunami alerts
  • Design upgrades
Thanks to your past donations, these features have been added recently:
  • Earthquake archive back to 1900
  • Additional data sources
Download and Upgrade the Volcanoes & Earthquakes app to get one of the fastest seismic and volcano alerts online:
Android | IOS
Thank you!
Copyrights: VolcanoDiscovery and other sources as noted.
Use of material: Most texts and images, in particular photographs, on this website are protected by copyright. Further reproduction and use of without authorization is usually not consented. If you are not sure or need licensing rights for photographs, for example for publications and commercial use, please contact us.