QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

35 km NE of Chase, Alaska

Yes. A magnitude 2.1 earthquake was recorded 35 km NE of Chase, Alaska, at 6:09 am AKDT on 23 April 2019 (14:09 UTC), 75 km deep.

· 75 km deep · released about 43 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Matanuska-Susitna Borough 51 kmDenali Borough 109 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
Magnitude
M 2.1 (ml)
Depth
75 km below the surface
Felt
no reports yet
Nearest
Matanuska-Susitna Borough, 51 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2617 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. 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.

  1. Mineral, Virginia 2011 M 5.8 350,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 250,000× the energy of this one
  3. Around the size people start to feel M 3.0 22× the energy of this one
  4. 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 4.6 on 2016-04-26 — about 5,600 times the energy of this one.

Before 2016, the USGS record lists 8 earthquakes of M5 or more within 50 km; the five largest:

  1. 5.6 44 km S of Cantwell, AK · 48 km NE of this epicentre
  2. 5.4 54 km NE of Chase, Alaska · 19 km NE of this epicentre
  3. 5.1 49 km NE of Chase, Alaska · 15 km NE of this epicentre
  4. 5.1 50 km N of Chase, Alaska · 22 km NNW of this epicentre
  5. 5.1 29 km NNE of Petersville, Alaska · 39 km W 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 62.7138, -149.7199. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Matanuska-Susitna Borough, AK 51 km (32 mi) SSE earthquakes near Matanuska-Susitna Borough
Denali Borough, AK 109 km (68 mi) N earthquakes near Denali Borough

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

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

  1. 2.1 38 km ENE of Chase, Alaska
  2. 1.9 39 km SSW of Cantwell, Alaska
  3. 1.8 64 km N of Chase, Alaska
  4. 1.6 52 km NNE of Chase, Alaska
  5. 2.4 16 km ESE of Chase, Alaska
  6. 1.8 57 km SSW of Cantwell, Alaska
  7. 1.9 46 km SW of Cantwell, Alaska
  8. 1.6 49 km SW of Cantwell, Alaska
  9. 1.5 46 km SSW of Cantwell, Alaska
  10. 1.5 22 km NNE of Susitna North, Alaska
  11. 1.8 14 km NE of Chase, Alaska
  12. 1.9 38 km NE of Susitna North, Alaska
  13. 1.5 36 km NE of Susitna North, Alaska
  14. 1.6 56 km SSW of Cantwell, Alaska
  15. 2.1 57 km N of Chase, 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.