QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6md

Earthquake near Honaunau-Napoopoo, HI

No earthquake was likely felt in Honaunau-Napoopoo in the 24 hours to 10:28 am HST (20:28 UTC). The last one was M 3.1, 26 km (16 mi) ESE, at 11:59 am HST on 4 November 2026, estimated intensity II (weak) in town; 2 felt reports to USGS. Every earthquake near Honaunau-Napoopoo

This page: a magnitude 1.6 earthquake was recorded 4 km (3 mi) east of Honaunau-Napoopoo, HI, at 10:18 am HST on 12 July 2020 (20:18 UTC), 8.6 km deep.

USGS: 4 km E of Honaunau-Napoopoo, Hawaii

10:18 am HST, Jul 12, 2020 · · 8.6 km deep · released about 8.4 lb of TNT

Every earthquake near Honaunau-Napoopoo Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Hawaii County 38 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
10:18 am HST on 12 July 2020 ()
Where
4 km (3 mi) east of Honaunau-Napoopoo, HI · earthquakes near Honaunau-Napoopoo
Hawaii today
every earthquake in Hawaii in the last 24 hours
Magnitude
M 1.6 (md)
Depth
8.6 km below the surface
Felt
no reports yet
Nearest
Hawaii County, 38 km ENE
Nearest mapped fault
Mauna Loa Volcano, 20 km from its surface trace — near is not the same as on
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2315 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 8 km (5 mi) from the epicentre. In Honaunau-Napoopoo, 4 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 4 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 8.4 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,800,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,300,000× the energy of this one
  3. Around the size people start to feel M 3.0 110× the energy of this one
  4. This earthquake M 1.6 about 8.4 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 5.3 on 2019-04-14 — about 370,000 times the energy of this one.

Before 2016, the USGS record lists 20 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.7 22 km W of Volcano, Hawaii · 40 km E of this epicentre
  2. 6.7 14 km SW of Puako, Hawaii · 49 km NNW of this epicentre
  3. 6.5 Hualālai area, Hawaii · 38 km NNW of this epicentre
  4. 6.4 Kaoiki area, Hawaii · 45 km E of this epicentre
  5. 6.3 20 km SSW of Honaunau-Napoopoo, Hawaii · 22 km SSW 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 19.4497, -155.8260. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Hawaii County, HI 38 km (23 mi) ENE earthquakes near Hawaii County

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

Aftershocks so far

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

  1. 2.3 2 km WSW of P?hala, Hawaii
  2. 2.0 2 km SE of P?hala, Hawaii
  3. 2.0 6 km ENE of P?hala, Hawaii
  4. 2.0 2 km SE of P?hala, Hawaii
  5. 2.0 1 km S of P?hala, Hawaii
  6. 1.8 16 km S of Honaunau-Napoopoo, Hawaii
  7. 1.8 25 km E of Honaunau-Napoopoo, Hawaii
  8. 1.7 18 km NE of P?hala, Hawaii
  9. 2.3 3 km SSE of Pāhala, HI
  10. 1.8 21 km E of Honaunau-Napoopoo, Hawaii
  11. 1.9 Island of Hawaii, Hawaii
  12. 1.9 1 km NE of P?hala, Hawaii
  13. 2.0 3 km NE of P?hala, Hawaii
  14. 1.8 0 km W of P?hala, Hawaii
  15. 1.7 19 km N of P?hala, 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.