QuakeIndex

Earthquake · reviewed by a seismologist

M 3.7ml

Earthquake near Lanai City, HI

USGS: 49 km S of Lanai City, Hawaii

12:55 am HST, Sep 15, 2018 · · 8.4 km deep · released about 4.7 tons of TNT

Every earthquake near Lanai City Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Maui County 61 kmKalawao County 93 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
12:55 am HST on 15 September 2018 ()
Where
50 km (31 mi) S of Lanai City, HI · earthquakes near Lanai City
Magnitude
M 3.7 (ml)
Depth
8.4 km below the surface
Felt
5 reports · strongest reported intensity IV
Measured shaking
intensity I (ShakeMap)
Nearest
Maui County, 61 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2872 days ago

A magnitude 3.7 earthquake was recorded 50 km (31 mi) S of Lanai City, HI, at 12:55 am HST on 15 September 2018 (10:55 UTC). 5 people have reported feeling it to USGS. This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

How big was it?

This earthquake released about 4.7 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.7 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 36,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 1,600× the energy of this one
  3. Magna, Utah 2020 M 5.7 1,100× the energy of this one
  4. This earthquake M 3.7 about 4.7 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 9.8× 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

No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.

Before 2016, the USGS record since 1900 lists no earthquake of M5 or more within 50 km.

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 20.3827, -156.9008. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Maui County, HI 61 km (38 mi) NNE earthquakes near Maui County
Kalawao County, HI 93 km (58 mi) N earthquakes near Kalawao County

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

Aftershocks so far

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

  1. 2.5 61 km SSW of Mākena, Hawaii
  2. 2.5 80 km SSW of Mākena, Hawaii
  3. 2.7 54 km SSW of Mākena, Hawaii
  4. 2.7 36 km SSW of Mākena, Hawaii
  5. 2.5 47 km SSW of Mākena, Hawaii
  6. 2.7 85 km SSW of Mākena, Hawaii
  7. 3.1 48 km SSW of Mākena, Hawaii
  8. 2.5 81 km SW of Mākena, Hawaii
  9. 3.4 78 km SSW of Mākena, Hawaii
  10. 3.9 64 km SSW of Mākena, Hawaii
  11. 2.5 Maui region, Hawaii
  12. 3.8 46 km S of Lanai City, Hawaii
  13. 2.2 33 km S of M?kena, Hawaii
  14. 2.4 54 km SSW of M?kena, Hawaii
  15. 2.9 35 km SSW of M?kena, 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.