Earthquake · reviewed by a seismologist
M 1.9ml
61 km ESE of Fox River, Alaska
Yes. A magnitude 1.9 earthquake was recorded 61 km ESE of Fox River, Alaska, at 7:11 am AKST on 11 March 2021 (16:11 UTC), 24 km deep.
- When
- Magnitude
- M 1.9 (ml)
- Depth
- 24 km below the surface
- Felt
- no reports yet
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2038 days ago
Earthquake alerts for Seward, AK
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Alerts are on for .
Not a warning. An alert comes after USGS publishes a quake, usually minutes after the shaking. For early warning use ShakeAlert, through your phone's Wireless Emergency Alerts or the MyShake app.
This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
At this magnitude and depth it was probably too small to be felt, even directly above it. Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.
How big was it?
This earthquake released about 21 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 710,000× the energy of this one
- Magna, Utah 2020 M 5.7 500,000× the energy of this one
- Around the size people start to feel M 3.0 45× the energy of this one
- This earthquake M 1.9 about 21 lb of TNT
Energy from the Gutenberg–Richter relation (log10E = 1.5M + 4.8), rounded to two figures; bar length is magnitude, which is already a logarithm of energy. Magnitudes of past earthquakes from the USGS catalogue.
For this area
No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.
Before 2016, the USGS record lists 3 earthquakes of M5 or more within 50 km:
- 6.3 37 km SSE of Lowell Point, Alaska · 49 km ENE of this epicentre
- 6.2 43 km ESE of Halibut Cove, Alaska · 37 km WSW of this epicentre
- 5.6 52 km S of Lowell Point, Alaska · 29 km E of this epicentre
Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.
Where
Epicentre 59.5800, -150.0245. Map © OpenStreetMap contributors.
Aftershocks so far
57 earthquakes have been recorded within 50 km since this one.
- 1.6 Kenai Peninsula, Alaska
- 1.5 39 km SE of Fox River, Alaska
- 1.6 40 km ENE of Fox River, Alaska
- 2.5 42 km ESE of Fox River, Alaska
- 1.5 30 km ENE of Fox River, Alaska
- 1.6 36 km S of Lowell Point, Alaska
- 1.5 33 km WSW of Lowell Point, Alaska
- 1.7 38 km SE of Fox River, Alaska
- 1.5 32 km WSW of Lowell Point, Alaska
- 2.0 38 km SSW of Lowell Point, Alaska
- 1.5 30 km E of Fox River, Alaska
- 1.6 65 km ESE of Halibut Cove, Alaska
- 1.7 30 km E of Fox River, Alaska
- 2.4 96 km S of Lowell Point, Alaska
- 1.5 38 km ESE of Fox River, Alaska
Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of . QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.
On USGS
- The official USGS event page — the source of record for every value above
- Did you feel it? Report it to USGS — reports go to USGS, not to us
- ShakeMap for this event, when USGS has produced one
QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.