explosion · reviewed by a seismologist
M 2.4ml
Earthquake near Healy, AK
No earthquake was likely felt in Healy in the 24 hours to 11:13 am AKST (20:13 UTC). The last one was M 2.7, 23 km (14 mi) NNE, at 4:13 pm AKST on 3 November 2026, estimated intensity II (weak) in town. Every earthquake near Healy
No: USGS classifies this as a explosion, not an earthquake. A magnitude 2.4 explosion was recorded 18 km (11 mi) northeast of Healy, AK, at 3:48 pm AKDT on 31 March 2019 (23:48 UTC), less than 1 km deep.
USGS: 17 km NE of Healy, Alaska
- When
- 3:48 pm AKDT on 31 March 2019 ()
- Where
- 18 km (11 mi) northeast of Healy, AK · earthquakes near Healy
- Magnitude
- M 2.4 (ml)
- Depth
- 0.0 km below the surface
- Felt
- no reports yet
- Nearest
- Denali Borough, 73 km WSW
- Nearest mapped fault
- Park Road fault (Northern Foothills fold and thrust belt), 20 km from its surface trace — near is not the same as on
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2758 days ago
Earthquake alerts for Healy, 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, people at rest would likely notice it out to about 21 km (13 mi) from the epicentre. In Healy, 18 km away, the estimate is intensity II (weak). 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.
Likely felt in: Healy 18 km, intensity II. Estimated for each town centre; each link is that town's own record.
USGS catalogues this as explosion, not an earthquake.
How big was it?
This earthquake released about 120 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.4 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 130,000× the energy of this one
- Magna, Utah 2020 M 5.7 89,000× the energy of this one
- Around the size people start to feel M 3.0 7.9× the energy of this one
- This earthquake M 2.4 about 120 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 4.6 on 2018-01-19 — about 2,000 times the energy of this one.
Before 2016, the USGS record lists 3 earthquakes of M5 or more within 50 km:
- 7.1 Central Alaska · 13 km NNE of this epicentre
- 6.4 23 km ENE of Ferry, Alaska · 19 km N of this epicentre
- 6.1 35 km E of Healy, Alaska · 22 km ESE 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 63.9516, -148.6702. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Denali Borough, AK | 73 km (45 mi) | WSW | earthquakes near Denali Borough |
| Fairbanks North Star Borough, AK | 132 km (82 mi) | NE | earthquakes near Fairbanks North Star Borough |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
57 earthquakes have been recorded within 50 km since this one.
- 1.9 22 km E of Healy, Alaska
- 1.6 5 km SE of Healy, Alaska
- 2.5 40 km ENE of Healy, Alaska
- 1.8 18 km NE of Healy, Alaska
- 2.3 14 km NE of Healy, Alaska
- 1.9 5 km SW of Healy, Alaska
- 1.7 19 km E of Ferry, Alaska
- 2.6 37 km ENE of Ferry, Alaska
- 1.9 17 km E of Ferry, Alaska
- 1.7 22 km ESE of McKinley Park, Alaska
- 1.7 4 km ENE of McKinley Park, Alaska
- 1.8 5 km S of Healy, Alaska
- 2.0 19 km SSW of McKinley Park, Alaska
- 2.3 45 km ENE of Healy, Alaska
- 1.8 22 km E of Healy, 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.