QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9ml

Earthquake near Homer, AK

No earthquake was likely felt in Homer in the 24 hours to 12:43 pm AKST (21:43 UTC). The last one was M 4.3, 71 km (44 mi) NNE, at 2:30 am AKST on 1 November 2026, estimated intensity II (weak) in town; 115 felt reports to USGS. Every earthquake near Homer

This page: a magnitude 1.9 earthquake was recorded 47 km (29 mi) south of Homer, AK, at 8:25 am AKST on 20 November 2019 (17:25 UTC), 5.5 km deep.

USGS: 25 km ESE of Port Graham, Alaska

8:25 am AKST, Nov 20, 2019 · · 5.5 km deep · released about 21 lb of TNT

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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
8:25 am AKST on 20 November 2019 ()
Where
47 km (29 mi) south of Homer, AK · earthquakes near Homer
Magnitude
M 1.9 (ml)
Depth
5.5 km below the surface
Felt
no reports yet
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2537 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 14 km (9 mi) from the epicentre. In Homer, 47 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 21 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 710,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 500,000× the energy of this one
  3. Around the size people start to feel M 3.0 45× the energy of this one
  4. This earthquake M 1.9 about 21 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 4.3 on 2018-03-13 — about 4,000 times the energy of this one.

Before 2016, the USGS record lists 7 earthquakes of M5 or more within 50 km; the five largest:

  1. 5.7 30 km ESE of Port Graham, Alaska · 6 km E of this epicentre
  2. 5.5 6 km WNW of Nanwalek, Alaska · 36 km WNW of this epicentre
  3. 5.4 22 km ESE of Port Graham, Alaska · 5 km NNW of this epicentre
  4. 5.3 16 km SE of Seldovia, Alaska · 14 km N of this epicentre
  5. 5.3 41 km SSW of Nanwalek, Alaska · 47 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 59.2252, -151.4545. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 1.6 23 km S of Port Graham, Alaska
  2. 2.4 17 km SE of Port Graham, Alaska
  3. 1.8 22 km ESE of Seldovia Village, Alaska
  4. 2.1 33 km S of Port Graham, Alaska
  5. 2.0 Kenai Peninsula, Alaska
  6. 1.5 42 km S of Port Graham, Alaska
  7. 2.9 3 km NNW of Nanwalek, Alaska
  8. 2.1 39 km SSE of Port Graham, Alaska
  9. 2.9 41 km SSE of Port Graham, Alaska
  10. 1.6 49 km S of Nanwalek, Alaska
  11. 1.5 7 km N of Nanwalek, Alaska
  12. 1.5 11 km ENE of Seldovia Village, Alaska
  13. 1.7 5 km SW of Homer, Alaska
  14. 1.5 22 km SE of Seldovia Village, Alaska
  15. 2.1 17 km SE of Seldovia, 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.