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Light mag. 3.5 earthquake - 70 mi northeast of Boise, Ada County, Idaho, USA, on Monday, Mar 1, 2021 at 1:50 am (GMT -7)

Light mag. 3.5 earthquake - 70 mi northeast of Boise, Ada County, Idaho, USA, on Monday, Mar 1, 2021 at 1:50 am (GMT -7) Light mag. 3.5 earthquake - 70 mi northeast of Boise, Ada County, Idaho, USA, on Monday, Mar 1, 2021 at 1:50 am (GMT -7)

Light magnitude 3.5 earthquake at 10 km depth

1 Mar 09:07 UTC: First to report: USGS after 17 minutes.
Update Mon, 1 Mar 2021, 09:12

Small earthquake of magnitude 3.5 just reported 15 miles northwest of Stanley, Idaho, United States

3.5 quake 1 Mar 1:50 am (GMT -7)
3.5 quake 1 Mar 1:50 am (GMT -7)
A shallow magnitude 3.5 earthquake was reported early morning near Stanley, Custer County, Idaho, USA.
According to the United States Geological Survey, the quake hit on Monday 1 March 2021 at 1:50 am local time at a shallow depth of 6.2 miles. Shallow earthquakes are felt more strongly than deeper ones as they are closer to the surface. 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.
Our monitoring service identified a second report from the European-Mediterranean Seismological Centre (EMSC) which listed the quake at magnitude 3.5 as well.
Towns or cities near the epicenter where the quake might have been felt as very weak shaking include Stanley (pop. 68) located 15 miles from the epicenter.

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Earthquake details

Date & timeMar 1, 2021 08:50:41 UTC
Local time at epicenterMonday, Mar 1, 2021 at 1:50 am (GMT -7)
Depth10.0 km
Epicenter latitude / longitude44.3236°N / 115.2027°W (Custer, Idaho, United States)
Antipode44.324°S / 64.797°E
Shaking intensityLight shaking
Felt3 reports
Primary data sourceUSGS (United States Geological Survey)
Nearest volcanoShoshone (144 km / 89 mi)
Nearby towns and cities24 km (15 mi) WNW of Stanley (pop: 68) | Show on map | Quakes nearby
80 km (50 mi) WSW of Challis (pop: 1,040) | Show on map | Quakes nearby
96 km (60 mi) SE of McCall (pop: 3,110) | Show on map | Quakes nearby
98 km (61 mi) NW of Ketchum (pop: 2,730) | Show on map | Quakes nearby
112 km (70 mi) NE of Boise (pop: 146,000) | Show on map | Quakes nearby
116 km (72 mi) NE of Eagle (Ada County) (pop: 23,600) | Show on map | Quakes nearby
124 km (77 mi) NE of Meridian (pop: 90,700) | Show on map | Quakes nearby
134 km (84 mi) NE of Kuna (Ada County) (pop: 17,200) | Show on map | Quakes nearby
140 km (87 mi) NE of Nampa (pop: 89,800) | Show on map | Quakes nearby
140 km (87 mi) ENE of Caldwell (pop: 51,700) | Show on map | Quakes nearby
Weather at epicenter at time of quakeClear Sky -17°C (1 F), humidity: 78%, wind: 2 m/s (3 kts) from SE
Estimated seismic energy released1.1 x 1010 joules (3.12 megawatt hours, equivalent to 2.68 tons of TNT) | about seismic energy
Show interactive Map
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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.
3.510 km24 Km WNW of Stanley, Idaho, USAUSGS


Seismic station: Hailey, Idaho, USA (HLID/US network) | Distance from quake: 106 km / 66 mi | Show on map | Station Info
Seismic station Hailey, Idaho, USA: vertical movement plot around time of quake (source: IRIS/BUD)
Seismogram (vertical component) around time of quake. Thin dotted red line indicates time of quake. Seismic waves arrive some time later, depending on distance. Source: IRIS Buffer of Uniform Data (BUD) webtool
Show more

User reports for this quake (3)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
Leave a comment if you find a particular report interesting or want to add to it.
Flag as inappropriate.
Mark as helpful or interesting.
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Nampa Idaho / Moderate shaking (MMI V) / 2-5 s : It woke me up  
Boise / Light shaking (MMI IV) / horizontal (sideways) swinging / 1-2 s : Woke up to it, felt it shaking. Lived in CA for years so I know what to look for.  
Garden City (113.3 km SW of epicenter) [Map] / Light shaking (MMI IV) / 1-2 s

Earlier earthquakes in the same area

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