Earthquake · automatic estimate, may change
M 2.8ml
Southern Alaska
Yes. A magnitude 2.8 earthquake was recorded in Southern Alaska, at 11:47 am AKST on 17 February 2019 (20:47 UTC), 232 km deep. The magnitude and location are an automatic first estimate and may change.
- When
- Magnitude
- M 2.8 (ml)
- Depth
- 232 km below the surface
- Felt
- no reports yet
- Status
- Automatic — a machine’s first estimate, which may change
USGS · last changed by USGS · we first saw it 2826 days ago
Earthquake alerts for Willow, AK
Get a notification in this browser when USGS records an earthquake near Willow, AK. No account or email needed.
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 small earthquake. Shaking like this is often felt indoors nearby and very rarely causes 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 480 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 32,000× the energy of this one
- Magna, Utah 2020 M 5.7 22,000× the energy of this one
- Around the size people start to feel M 3.0 2× the energy of this one
- This earthquake M 2.8 about 480 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
The largest earthquake within 50 km since 2016 was M 4.1 on 2016-10-23 — about 89 times the energy of this one.
Before 2016, the USGS record lists 13 earthquakes of M5 or more within 50 km; the five largest:
- 6.9 27 km SE of Skwentna, Alaska · 40 km E of this epicentre
- 6.2 22 km WSW of Skwentna, Alaska · 15 km N of this epicentre
- 5.8 46 km SW of Skwentna, Alaska · 19 km SSW of this epicentre
- 5.7 47 km NW of Beluga, Alaska · 42 km S of this epicentre
- 5.7 19 km E of Skwentna, Alaska · 45 km ENE 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 61.8113, -151.7965. Map © OpenStreetMap contributors.
Aftershocks so far
56 earthquakes have been recorded within 50 km since this one.
- 1.5 39 km SW of Skwentna, Alaska
- 1.7 39 km SW of Skwentna, Alaska
- 2.3 43 km S of Skwentna, Alaska
- 2.4 41 km SW of Skwentna, Alaska
- 2.3 47 km NNW of Beluga, Alaska
- 2.8 40 km NW of Skwentna, Alaska
- 2.0 47 km SSW of Skwentna, Alaska
- 1.7 Central Alaska
- 1.5 41 km W of Susitna, Alaska
- 1.8 47 km NW of Beluga, Alaska
- 1.7 17 km N of Skwentna, Alaska
- 1.8 30 km WSW of Skwentna, Alaska
- 2.2 35 km W of Skwentna, Alaska
- 1.6 56 km SSW of Skwentna, Alaska
- 1.6 45 km WNW of Skwentna, 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.