Minor mag. 3.1 earthquake - 15 mi northwest of Nikiski, Kenai Peninsula, Alaska, USA, on Friday, Mar 12, 2021 at 3:53 am (GMT -9) -
Minor magnitude 3.1 earthquake at 73 km depth
12 Mar 12:56 UTC: First to report: EMSC after 3 minutes.
12 Mar 12:56: Now using data updates from USGS
12 Mar 18:24: Magnitude recalculated from 3.0 to 3.1. Hypocenter depth recalculated from 71.7 to 72.8 km (from 45 to 45 mi). Epicenter location corrected by 1.9 km (1.2 mi) towards N.
12 Mar 12:56: Now using data updates from USGS
12 Mar 18:24: Magnitude recalculated from 3.0 to 3.1. Hypocenter depth recalculated from 71.7 to 72.8 km (from 45 to 45 mi). Epicenter location corrected by 1.9 km (1.2 mi) towards N.
Update Fri, 12 Mar 2021, 13:12
Small tremor of magnitude 3.0 just reported 14 miles northwest of Nikiski, Alaska, United States3.0 quake 12 Mar 3:53 am (GMT -9)
Just 19 minutes ago, a 3.0-magnitude earthquake struck near Nikiski, Kenai Peninsula, Alaska, USA. The tremor was recorded early morning on Friday 12 March 2021 at 3:53 am local time, at an intermediate depth of 45 miles below the surface.
The event was filed by the United States Geological Survey, the first seismological agency to report it.
Our monitoring service identified a second report from the European-Mediterranean Seismological Centre (EMSC) which listed the quake at magnitude 3.1.
According to preliminary calculations, we do not expect that the quake was felt by many people and did not cause any damage. In Nikiski (pop. 4,500, 14 miles away), Kenai (pop. 7,700, 22 miles away), Ridgeway (pop. 2,000, 27 miles away), Soldotna (pop. 4,500, 30 miles away), Kalifornsky (pop. 7,900, 30 miles away), Cohoe (pop. 1,400, 33 miles away), and Sterling (pop. 5,600, 35 miles away), the quake was probably not felt.
The event was filed by the United States Geological Survey, the first seismological agency to report it.
Our monitoring service identified a second report from the European-Mediterranean Seismological Centre (EMSC) which listed the quake at magnitude 3.1.
According to preliminary calculations, we do not expect that the quake was felt by many people and did not cause any damage. In Nikiski (pop. 4,500, 14 miles away), Kenai (pop. 7,700, 22 miles away), Ridgeway (pop. 2,000, 27 miles away), Soldotna (pop. 4,500, 30 miles away), Kalifornsky (pop. 7,900, 30 miles away), Cohoe (pop. 1,400, 33 miles away), and Sterling (pop. 5,600, 35 miles away), the quake was probably not felt.
Earthquake data
Local time at epicenter: Friday, Mar 12, 2021 at 3:53 am (GMT -9)
Magnitude: 3.1
Depth: 72.8 km
Epicenter latitude / longitude: 60.8353°N / 151.6293°W
(Gulf of Alaska, Alaska, United States)Antipode: 60.835°S / 28.371°E
Nearest volcano: Spurr (63 km / 39 mi)
Nearby towns and cities:
25 km (15 mi) NW of Nikiski (pop: 4,490) --> See nearby quakes!
37 km (23 mi) SW of Tyonek (pop: 171) --> See nearby quakes!
37 km (23 mi) NNW of Kenai (pop: 7,660) --> See nearby quakes!
50 km (31 mi) NW of Soldotna (pop: 4,540) --> See nearby quakes!
50 km (31 mi) NNW of Kalifornsky (pop: 7,850) --> See nearby quakes!
58 km (36 mi) NW of Sterling (pop: 5,620) --> See nearby quakes!
102 km (64 mi) WSW of Alaska City (pop: 298,700) --> See nearby quakes!
123 km (77 mi) WSW of Eagle River (pop: 24,800) --> See nearby quakes!
123 km (77 mi) WSW of Eagle River (Anchorage) (pop: 24,800) --> See nearby quakes!
132 km (82 mi) SW of Knik-Fairview (pop: 14,900) --> See nearby quakes!
Weather at epicenter at time of quake:
Clear Sky
-18°C (-0 F), humidity: 65%, wind: 3 m/s (5 kts) from NNE
Primary data source: USGS (United States Geological Survey)
Clear Sky
-18°C (-0 F), humidity: 65%, wind: 3 m/s (5 kts) from NNEEstimated released energy: 2.8 x 109 joules (783 kilowatt hours, equivalent to 0.674 tons of TNT) | about seismic energy
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.
| Mag. | Depth | Location | Source |
| 3.1 | 73 km | 24 Km NW of Nikiski, Alaska, USA | USGS |
| 3.5 | 83 km | KENAI PENINSULA, ALASKA, USA | EMSC |
User reports for this quake
User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
Earlier earthquakes in the same area
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