QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7md

57 km SE of P?hala, Hawaii

Yes. A magnitude 1.7 earthquake was recorded 57 km SE of P?hala, Hawaii, at 8:10 am HST on 28 March 2019 (18:10 UTC), 10 km deep.

· 10 km deep · released about 11 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Hawaii County 92 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
Hawaii today
every earthquake in Hawaii in the last 24 hours
Magnitude
M 1.7 (md)
Depth
10 km below the surface
Felt
no reports yet
Nearest
Hawaii County, 92 km NNW
Nearest mapped fault
Lo'ihi Seamount, 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 2787 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 7 km (4 mi) from the epicentre. 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 11 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,300,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 930,000× the energy of this one
  3. Around the size people start to feel M 3.0 83× the energy of this one
  4. This earthquake M 1.7 about 11 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 6.9 on 2018-05-04 — about 59,000,000 times the energy of this one.

Before 2016, the USGS record lists 14 earthquakes of M5 or more within 50 km; the five largest:

  1. 7.7 17 km SSW of Leilani Estates, Hawaii · 48 km N of this epicentre
  2. 6.1 11 km SE of Naalehu, Hawaii · 50 km WNW of this epicentre
  3. 5.8 Kilauea area, Hawaii · 50 km WNW of this epicentre
  4. 5.7 15 km SSE of Fern Forest, Hawaii · 49 km N of this epicentre
  5. 5.7 15 km S of Fern Forest, Hawaii · 48 km N 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 18.8988, -155.0378. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Hawaii County, HI 92 km (57 mi) NNW earthquakes near Hawaii County

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

Aftershocks so far

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

  1. 1.9 9 km SSE of P?hala, Hawaii
  2. 2.6 14 km S of Fern Forest, Hawaii
  3. 1.9 10 km SE of P?hala, Hawaii
  4. 2.4 9 km SSE of P?hala, Hawaii
  5. 2.3 12 km SE of P?hala, Hawaii
  6. 2.2 12 km SSE of P?hala, Hawaii
  7. 2.8 12 km SE of P?hala, Hawaii
  8. 2.8 12 km SE of P?hala, Hawaii
  9. 1.7 14 km SSE of Volcano, Hawaii
  10. 1.8 13 km E of Naalehu, Hawaii
  11. 2.3 14 km SSE of P?hala, Hawaii
  12. 2.5 14 km E of Naalehu, Hawaii
  13. 2.1 22 km SSE of Fern Forest, Hawaii
  14. 2.3 18 km SE of P?hala, Hawaii
  15. 1.9 9 km SSE 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.