QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7ml

Earthquake near Cohoe, AK

No earthquake was likely felt in Cohoe in the 24 hours to 2:44 am AKST (11:44 UTC). The last one was M 4.3, 28 km (17 mi) SE, at 2:30 am AKST on 1 November 2026, estimated intensity II (weak) in town; 115 felt reports to USGS. Every earthquake near Cohoe

This page: a magnitude 1.7 earthquake was recorded 48 km (30 mi) southeast of Cohoe, AK, at 3:42 am AKDT on 28 October 2019 (11:42 UTC), 31 km deep.

USGS: 29 km NNE of Fox River, Alaska

3:42 am AKDT, Oct 28, 2019 · · 31 km deep · released about 11 lb of TNT

Every earthquake near Cohoe Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Kenai Peninsula Borough 97 km
Distance rings around the epicentre, with the nearest towns at their true direction and later quakes as coloured dots. Not a shaking map — see the USGS ShakeMap for that.
When
3:42 am AKDT on 28 October 2019 ()
Where
48 km (30 mi) southeast of Cohoe, AK · earthquakes near Cohoe
Magnitude
M 1.7 (ml)
Depth
31 km below the surface
Felt
no reports yet
Nearest
Kenai Peninsula Borough, 97 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2551 days ago

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 Cohoe, 48 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.

How big was it?

This earthquake released about 11 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,400,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,000,000× the energy of this one
  3. Around the size people start to feel M 3.0 89× the energy of this one
  4. This earthquake M 1.7 about 11 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 4.4 on 2019-01-09 — about 11,000 times the energy of this one.

Before 2016, the USGS record lists 3 earthquakes of M5 or more within 50 km:

  1. 6.0 31 km S of Funny River, Alaska · 16 km N of this epicentre
  2. 6.0 6 km SSE of Fox River, Alaska · 35 km SSW of this epicentre
  3. 5.9 13 km N of Fox River, Alaska · 21 km SW 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 60.0806, -150.6659. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Kenai Peninsula Borough, AK 97 km (60 mi) WNW earthquakes near Kenai Peninsula 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. 1.5 19 km S of Funny River, Alaska
  2. 1.6 24 km ESE of Clam Gulch, Alaska
  3. 2.4 29 km ENE of Fox River, Alaska
  4. 1.5 18 km ESE of Clam Gulch, Alaska
  5. 3.3 32 km SE of Fox River, Alaska
  6. 1.5 37 km NE of Fox River, Alaska
  7. 3.4 39 km NE of Fox River, Alaska
  8. 1.9 18 km SSE of Soldotna, Alaska
  9. 1.7 29 km NNE of Fox River, Alaska
  10. 1.7 16 km E of Fox River, Alaska
  11. 2.3 21 km ESE of Fox River, Alaska
  12. 1.5 5 km S of Soldotna, Alaska
  13. 1.5 12 km SSE of Kasilof, Alaska
  14. 2.0 30 km ESE of Clam Gulch, Alaska
  15. 1.5 16 km ESE of Kasilof, 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

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.