21 km SSE of Honaunau-Napoopoo, Hawaii

2021-01-29 16:30 UTC · 8.9 km deep · released about 1,200 lb of TNT

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: 2021-01-29 16:30 UTC
Magnitude: M 3.1 (ml)
Depth: 8.9 km below the surface
Felt: 3 reports · strongest reported intensity III
Nearest: Hawaii County, 49 km NE
Status: Reviewed by a seismologist

USGS · last changed by USGS 1511 days ago · we first saw it 1511 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 3 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1,200 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

Northridge, California 1994 M 6.7 280,000× the energy of this one
Mineral, Virginia 2011 M 5.8 12,000× the energy of this one
Magna, Utah 2020 M 5.7 8,800× the energy of this one
This earthquake M 3.1 about 1,200 lb of TNT
Around the size people start to feel M 3.0 this one released 1.3× more

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.

Where

Map loads when it scrolls into view

Epicentre 19.2667, -155.8048. Map © OpenStreetMap contributors.

Nearby places

Place	Distance	Direction
Hawaii County, HI	49 km (30 mi)	SW of here	earthquakes near Hawaii County

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.

1.9 27 km E of Honaunau-Napoopoo, Hawaii 12:02 UTC
1.8 4 km SE of P?hala, Hawaii 08:00 UTC
1.7 Island of Hawaii, Hawaii 06:59 UTC
2.1 6 km E of P?hala, Hawaii 06:42 UTC
2.0 6 km ENE of P?hala, Hawaii 06:23 UTC
1.7 3 km E of P?hala, Hawaii 06:08 UTC
1.8 30 km E of Honaunau-Napoopoo, Hawaii 06:05 UTC
1.7 2 km W of Honaunau-Napoopoo, Hawaii 01:52 UTC
1.6 25 km ESE of Honaunau-Napoopoo, Hawaii 21:41 UTC
1.9 3 km E of P?hala, Hawaii 13:06 UTC
2.0 6 km ENE of P?hala, Hawaii 07:07 UTC
2.0 4 km S of P?hala, Hawaii 05:50 UTC
2.7 3 km SE of P?hala, Hawaii 05:43 UTC
1.7 4 km S of P?hala, Hawaii 05:13 UTC
2.3 3 km ENE of P?hala, Hawaii 01:23 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 03:14 UTC. QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

On USGS

The official USGS event page — the source of record for every value above
Did you feel it? Report it to USGS — reports go to USGS, not to us
ShakeMap for this event, when USGS has produced one

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