Earthquake near Honaunau-Napoopoo, HI

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

At this magnitude and depth, people at rest would likely notice it out to about 51 km (32 mi) from the epicentre. In Honaunau-Napoopoo, 26 km away, the estimate is intensity II (weak). 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.

Likely felt in: Honaunau-Napoopoo 26 km, intensity II · Pāhala 29 km, intensity II · Captain Cook 33 km, intensity II · Volcano 40 km, intensity II · Hōlualoa 41 km, intensity II · Discovery Harbor 42 km, intensity II · Hawaiian Ocean View 42 km, intensity II · Kailua-Kona 47 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 1.3 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.3 would have released about 32 times as much.

1. Northridge, California 1994 M 6.7 130,000× the energy of this one
2. Mineral, Virginia 2011 M 5.8 6,000× the energy of this one
3. Magna, Utah 2020 M 5.7 4,300× the energy of this one
4. This earthquake M 3.3 about 1.3 tons of TNT
5. Around the size people start to feel M 3.0 this one released 2.6× 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.

For this area

The largest earthquake within 50 km since 2016 was M 5.5 on 2019-03-13 — about 2,500 times the energy of this one.

Before 2016, the USGS record lists 34 earthquakes of M5 or more within 50 km; the five largest:

1. 6.7 22 km W of Volcano, Hawaii · 18 km E of this epicentre Nov 16, 1983
2. 6.4 Kaoiki area, Hawaii · 23 km E of this epicentre Mar 28, 1915
3. 6.3 20 km SSW of Honaunau-Napoopoo, Hawaii · 36 km WSW of this epicentre Aug 21, 1951
4. 6.2 8 km SW of Volcano, Hawaii · 34 km E of this epicentre Nov 2, 1918
5. 6.2 21 km N of Pahala, Hawaii · 18 km E of this epicentre Jun 28, 1962

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 19.4240, -155.6188. Map © OpenStreetMap contributors.

Nearby places

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

Aftershocks so far

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

1. 2.3 9 km SSW of Volcano, Hawaii 11:56 UTC
2. 2.6 25 km ESE of Honaunau-Napoopoo, Hawaii 10:54 UTC
3. 3.0 24 km ESE of Honaunau-Napoopoo, Hawaii 10:50 UTC
4. 2.1 8 km ENE of P?hala, Hawaii 03:11 UTC
5. 1.8 5 km SW of Volcano, Hawaii 02:31 UTC
6. 2.0 21 km E of Honaunau-Napoopoo, Hawaii 10:29 UTC
7. 1.9 21 km E of Honaunau-Napoopoo, Hawaii 10:27 UTC
8. 2.5 21 km E of Honaunau-Napoopoo, Hawaii 10:24 UTC
9. 2.1 21 km E of Honaunau-Napoopoo, Hawaii 10:19 UTC
10. 1.9 9 km SSE of P?hala, Hawaii 08:27 UTC
11. 1.8 7 km SSW of Volcano, Hawaii 08:12 UTC
12. 2.3 8 km E of P?hala, Hawaii 07:04 UTC
13. 1.8 10 km ENE of P?hala, Hawaii 05:22 UTC
14. 2.0 6 km SW of Volcano, Hawaii 00:32 UTC
15. 1.7 5 km SW of Volcano, Hawaii 23:42 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 19:23 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.