QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5ml

Earthquake near Seward, AK

No earthquake was likely felt in Seward in the 24 hours to 11:15 pm AKST (08:15 UTC). The last one was M 4.3, 83 km (52 mi) W, at 2:30 am AKST on 1 November 2026, estimated intensity II (weak) in town; 115 felt reports to USGS. Every earthquake near Seward

This page: a magnitude 1.5 earthquake was recorded 44 km (27 mi) east-southeast of Seward, AK, at 11:12 pm AKDT on 26 April 2020 (07:12 UTC), less than 1 km deep.

USGS: 42 km ESE of Lowell Point, Alaska

11:12 pm AKDT, Apr 26, 2020 · · 0.3 km deep · released about 5.4 lb of TNT

Every earthquake near Seward Felt it? Tell USGS Check my area
10 km30 km60 km120 km N
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
11:12 pm AKDT on 26 April 2020 ()
Where
44 km (27 mi) east-southeast of Seward, AK · earthquakes near Seward
Magnitude
M 1.5 (ml)
Depth
0.3 km below the surface
Felt
no reports yet
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2372 days ago

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 10 km (6 mi) from the epicentre. In Seward, 44 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 5.4 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,800,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 2,000,000× the energy of this one
  3. Around the size people start to feel M 3.0 180× the energy of this one
  4. This earthquake M 1.5 about 5.4 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

No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.

Before 2016, the USGS record lists 12 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.6 3 km SW of Bear Creek, Alaska · 46 km WNW of this epicentre
  2. 6.3 37 km SSE of Lowell Point, Alaska · 33 km SW of this epicentre
  3. 6.1 25 km WSW of Chenega, Alaska · 18 km ENE of this epicentre
  4. 6.0 54 km SE of Lowell Point, Alaska · 28 km SSW of this epicentre
  5. 5.9 33 km SSE of Lowell Point, Alaska · 28 km WSW 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 59.9234, -148.7414. Map © OpenStreetMap contributors.

Aftershocks so far

59 earthquakes have been recorded within 50 km since this one.

  1. 1.9 36 km WSW of Chenega, Alaska
  2. 1.7 32 km ESE of Primrose, Alaska
  3. 1.5 34 km ESE of Lowell Point, Alaska
  4. 1.7 25 km NW of Chenega, Alaska
  5. 1.7 30 km WSW of Chenega, Alaska
  6. 2.3 60 km SSW of Chenega, Alaska
  7. 2.6 13 km ESE of Lowell Point, Alaska
  8. 1.8 20 km WNW of Chenega, Alaska
  9. 1.6 24 km WSW of Chenega, Alaska
  10. 2.0 26 km SE of Lowell Point, Alaska
  11. 2.6 31 km ESE of Lowell Point, Alaska
  12. 1.6 12 km ESE of Lowell Point, Alaska
  13. 1.7 26 km W of Chenega, Alaska
  14. 2.0 29 km WSW of Chenega, Alaska
  15. 1.8 39 km ESE of Lowell Point, 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.