QuakeIndex

Earthquake · automatic estimate, may change

M 1.8md

4 km SW of Pāhala, Hawaii

· 30 km deep · released about 14 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Hawaii County 47 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 1.8 (md)
Depth
30 km below the surface
Felt
no reports yet
Nearest
Hawaii County, 47 km N
Nearest mapped fault
Ka'oiki-Honu'apo fault system, 2 km from its surface trace — near is not the same as on
Status
Automatic — a machine’s first estimate, which may change

USGS · last changed by USGS · we first saw it 2 hours ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 14 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.

  1. Mineral, Virginia 2011 M 5.8 1,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 790,000× the energy of this one
  3. Around the size people start to feel M 3.0 70× the energy of this one
  4. This earthquake M 1.8 about 14 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 6.2 on 2021-10-10 — about 4,600,000 times the energy of this one.

Before 2016, the USGS record lists 42 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.7 22 km W of Volcano, Hawaii · 29 km NNE of this epicentre
  2. 6.4 Kaoiki area, Hawaii · 31 km NNE of this epicentre
  3. 6.3 20 km SSW of Honaunau-Napoopoo, Hawaii · 45 km WNW of this epicentre
  4. 6.2 8 km SW of Volcano, Hawaii · 33 km NE of this epicentre
  5. 6.2 21 km N of Pahala, Hawaii · 25 km NNE 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 19.1735, -155.5078. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Hawaii County, HI 47 km (29 mi) N earthquakes near Hawaii County

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

Aftershocks so far

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

  1. 2.0 4 km WSW of Volcano, Hawaii
  2. 2.0 5 km WSW of Volcano, Hawaii
  3. 1.9 5 km SW of Volcano, Hawaii
  4. 2.1 5 km WSW of Volcano, Hawaii
  5. 2.2 5 km WSW of Volcano, Hawaii
  6. 2.1 5 km WSW of Volcano, Hawaii
  7. 2.0 5 km WSW of Volcano, Hawaii
  8. 2.1 5 km WSW of Volcano, Hawaii
  9. 2.0 4 km WSW of Volcano, Hawaii
  10. 2.1 5 km WSW of Volcano, Hawaii
  11. 1.6 5 km WSW of Volcano, Hawaii
  12. 2.3 5 km WSW of Volcano, Hawaii
  13. 1.8 5 km WSW of Volcano, Hawaii

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.