Earthquake · reviewed by a seismologist
M 1.8ml
Earthquake near Ridgeway, AK
No earthquake was likely felt in Ridgeway in the 24 hours to 12:45 pm AKST (21:45 UTC). The last one was M 4.3, 38 km (24 mi) SSE, at 2:30 am AKST on 1 November 2026, estimated intensity II (weak) in town; 115 felt reports to USGS. Every earthquake near Ridgeway
This page: a magnitude 1.8 earthquake was recorded 17 km (10 mi) north-northeast of Ridgeway, AK, at 10:53 pm AKDT on 12 September 2024 (06:53 UTC), 65 km deep.
USGS: 16 km NNE of Ridgeway, Alaska
84 km (52 mi) SW of Anchorage, AK
- When
- 10:53 pm AKDT on 12 September 2024 ()
- Where
- 17 km (10 mi) north-northeast of Ridgeway, AK · earthquakes near Ridgeway
- Magnitude
- M 1.8 (ml)
- Depth
- 65 km below the surface
- Felt
- no reports yet
- Nearest
- Kenai Peninsula Borough, 81 km WSW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 756 days ago
Earthquake alerts for Ridgeway, AK
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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. In Ridgeway, 17 km away, the estimate is intensity I (not felt). 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.
Earthquakes near other towns within 30 km: Nikiski, Sterling, Kenai, Soldotna, Funny River.
How big was it?
This earthquake released about 15 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 1,000,000× the energy of this one
- Magna, Utah 2020 M 5.7 710,000× the energy of this one
- Around the size people start to feel M 3.0 63× the energy of this one
- This earthquake M 1.8 about 15 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 4.8 on 2022-07-12 — about 32,000 times the energy of this one.
Before 2016, the USGS record lists 10 earthquakes of M5 or more within 50 km; the five largest:
- 6.8 Southern Alaska · 47 km N of this epicentre
- 6.8 24 km ENE of Sterling, Alaska · 32 km E of this epicentre
- 6.7 6 km WNW of Nikiski, Alaska · 23 km WNW of this epicentre
- 6.4 19 km SSE of Tyonek, Alaska · 25 km N of this epicentre
- 5.7 19 km NNW of Nikiski, Alaska · 30 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 60.6729, -150.9785. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Kenai Peninsula Borough, AK | 81 km (50 mi) | WSW | earthquakes near Kenai Peninsula Borough |
| Anchorage Municipality, AK | 107 km (67 mi) | ENE | earthquakes near Anchorage Municipality |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
60 earthquakes have been recorded within 50 km since this one.
- 1.5 6 km SSW of Kenai, Alaska
- 1.5 17 km NNE of Point Possession, Alaska
- 1.5 6 km E of Kasilof, Alaska
- 2.0 1 km WSW of Funny River, Alaska
- 1.6 11 km E of Tyonek, Alaska
- 2.1 21 km NNE of Sterling, Alaska
- 1.6 3 km E of Point Possession, Alaska
- 1.7 8 km E of Nikiski, Alaska
- 1.8 21 km S of Funny River, Alaska
- 1.6 21 km SSE of Funny River, Alaska
- 1.5 16 km NW of Nikiski, Alaska
- 1.6 3 km SW of Kasilof, Alaska
- 1.5 12 km S of Funny River, Alaska
- 1.9 4 km SW of Funny River, Alaska
- 1.6 21 km SSW of Tyonek, 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.