Earthquake · reviewed by a seismologist
M 2.1ml
Kenai Peninsula, Alaska
Yes. A magnitude 2.1 earthquake was recorded in the Kenai Peninsula, Alaska, at 10:22 pm AKDT on 27 June 2023 (06:22 UTC), 14 km deep.
- When
- Magnitude
- M 2.1 (ml)
- Depth
- 14 km below the surface
- Felt
- no reports yet
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1232 days ago
Earthquake alerts for Homer, 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 9 km (6 mi) from the epicentre. 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 43 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 350,000× the energy of this one
- Magna, Utah 2020 M 5.7 250,000× the energy of this one
- Around the size people start to feel M 3.0 22× the energy of this one
- This earthquake M 2.1 about 43 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 4.7 on 2023-02-24 — about 7,900 times the energy of this one.
Before 2016, the USGS record lists 6 earthquakes of M5 or more within 50 km; the five largest:
- 6.2 43 km ESE of Halibut Cove, Alaska · 35 km NE of this epicentre
- 5.7 78 km SSE of Port Graham, Alaska · 45 km S of this epicentre
- 5.7 30 km ESE of Port Graham, Alaska · 22 km WNW of this epicentre
- 5.4 22 km ESE of Port Graham, Alaska · 30 km WNW of this epicentre
- 5.3 16 km SE of Seldovia, Alaska · 35 km NW 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 59.1625, -150.9858. Map © OpenStreetMap contributors.
Aftershocks so far
55 earthquakes have been recorded within 50 km since this one.
- 2.0 19 km SSW of Halibut Cove, Alaska
- 2.3 33 km SE of Port Graham, Alaska
- 1.8 10 km ESE of Halibut Cove, Alaska
- 3.1 52 km SE of Port Graham, Alaska
- 1.6 51 km SE of Port Graham, Alaska
- 2.5 52 km SE of Port Graham, Alaska
- 2.7 47 km SE of Port Graham, Alaska
- 2.4 23 km ESE of Port Graham, Alaska
- 2.2 14 km S of Halibut Cove, Alaska
- 1.6 15 km E of Seldovia Village, Alaska
- 1.8 63 km SSE of Halibut Cove, Alaska
- 1.8 3 km S of Halibut Cove, Alaska
- 1.7 35 km ESE of Halibut Cove, Alaska
- 1.6 72 km SSE of Halibut Cove, Alaska
- 1.6 36 km ESE of Port Graham, 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.