Earthquake · reviewed by a seismologist
M 4.5mwr
Earthquake near Eagle River, AK
No earthquake was likely felt in Eagle River in the 24 hours to 3:44 am AKST (12:44 UTC). The last one was M 3.6, 20 km (12 mi) NNW, at 6:49 am AKDT on 16 October 2026, estimated intensity II (weak) in town; 485 felt reports to USGS. Every earthquake near Eagle River
This page: a magnitude 4.5 earthquake was recorded 4 km (2 mi) south-southwest of Eagle River, AK, at 6:47 am AKDT on 3 July 2023 (14:47 UTC), 36 km deep. 2,720 people have reported feeling it to USGS.
USGS: 3 km SSW of Eagle River, Alaska
18 km (11 mi) ENE of Anchorage, AK
- When
- 6:47 am AKDT on 3 July 2023 ()
- Where
- 4 km (2 mi) south-southwest of Eagle River, AK · earthquakes near Eagle River
- Magnitude
- M 4.5 (mwr)
- Depth
- 36 km below the surface
- Felt
- 2,720 reports · strongest reported intensity V
- Measured shaking
- intensity IV (ShakeMap)
- USGS impact alert
- green
- Tsunami
- USGS flagged this event for tsunami evaluation. Follow tsunami.gov for official messages.
- Nearest
- Anchorage Municipality, 21 km SE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 351 days ago
Earthquake alerts for Eagle River, 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 light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon.
At this magnitude and depth, people at rest would likely notice it out to about 135 km (84 mi) from the epicentre. In Eagle River, 4 km away, the estimate is intensity III (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: Eagle River 4 km, intensity III · Anchorage 18 km, intensity III · Knik-Fairview 25 km, intensity III · Big Lake 32 km, intensity III · Tanaina 38 km, intensity III · Butte 41 km, intensity III · Palmer 43 km, intensity III · Girdwood 45 km, intensity III. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 85 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.5 would have released about 32 times as much.
- Northridge, California 1994 M 6.7 2,000× the energy of this one
- Mineral, Virginia 2011 M 5.8 89× the energy of this one
- Magna, Utah 2020 M 5.7 63× the energy of this one
- This earthquake M 4.5 about 85 tons of TNT
- Around the size people start to feel M 3.0 this one released 180× more
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 7.1 on 2018-11-30 — about 7,900 times the energy of this one.
Before 2016, the USGS record lists 15 earthquakes of M5 or more within 50 km; the five largest:
- 5.6 11 km NW of Big Lake, Alaska · 43 km NW of this epicentre
- 5.5 2 km ENE of Eagle River, Alaska · 6 km NE of this epicentre
- 5.5 9 km E of Susitna, Alaska · 49 km NW of this epicentre
- 5.5 26 km SSW of Anchorage, Alaska · 43 km SW of this epicentre
- 5.3 3 km NNE of Houston, Alaska · 42 km NNW 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 61.2895, -149.5901. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Anchorage Municipality, AK | 21 km (13 mi) | SE | earthquakes near Anchorage Municipality |
| Matanuska-Susitna Borough, AK | 109 km (68 mi) | N | earthquakes near Matanuska-Susitna Borough |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
59 earthquakes have been recorded within 50 km since this one.
- 1.9 6 km N of Houston, Alaska
- 2.6 2 km NNW of Anchorage, Alaska
- 1.5 10 km S of Willow, Alaska
- 2.1 1 km ESE of Anchorage, Alaska
- 1.9 4 km NW of Meadow Lakes, Alaska
- 1.6 3 km NNW of Anchorage, Alaska
- 1.6 3 km SSW of Big Lake, Alaska
- 1.6 1 km SW of Point MacKenzie, Alaska
- 3.0 5 km WSW of Big Lake, Alaska
- 1.6 8 km N of Houston, Alaska
- 1.9 3 km WSW of Houston, Alaska
- 1.9 5 km NNW of Knik, Alaska
- 1.5 5 km N of Meadow Lakes, Alaska
- 1.6 8 km N of Houston, Alaska
- 2.4 10 km S of Willow, 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.