QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7md

101 km NNW of Charlotte Amalie, U.S. Virgin Islands

Yes. A magnitude 2.7 earthquake was recorded 101 km NNW of Charlotte Amalie, U.S. Virgin Islands, at 5:10 am AST on 6 July 2018 (09:10 UTC), 82 km deep.

· 82 km deep · released about 380 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Culebra Municipio 100 kmFajardo Municipio 102 kmLuquillo Municipio 110 kmRío Grande Municipio 114 kmCeiba Municipio 117 kmLoíza Municipio 117 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
Magnitude
M 2.7 (md)
Depth
82 km below the surface
Felt
no reports yet
Nearest
Culebra Municipio, 100 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2967 days ago

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

At this magnitude and depth it was probably too small to be felt, even directly above it. 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 380 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 40,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 29,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.5× the energy of this one
  4. This earthquake M 2.7 about 380 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 4.5 on 2018-02-09 — about 450 times the energy of this one.

Before 2016, the USGS record lists 9 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.1 91 km N of Charlotte Amalie, U.S. Virgin Islands · 38 km E of this epicentre
  2. 6.0 112 km N of Charlotte Amalie, U.S. Virgin Islands · 31 km ENE of this epicentre
  3. 5.6 112 km N of Charlotte Amalie, U.S. Virgin Islands · 35 km ENE of this epicentre
  4. 5.1 107 km N of Charlotte Amalie, U.S. Virgin Islands · 26 km ENE of this epicentre
  5. 5.1 122 km NNE of Vieques, Puerto Rico · 25 km NNW 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 19.2210, -65.1890. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Culebra Municipio, PR 100 km (62 mi) S earthquakes near Culebra Municipio
Fajardo Municipio, PR 102 km (63 mi) SSW earthquakes near Fajardo Municipio
Luquillo Municipio, PR 110 km (68 mi) SSW earthquakes near Luquillo Municipio
Río Grande Municipio, PR 114 km (71 mi) SW earthquakes near Río Grande Municipio
Ceiba Municipio, PR 117 km (73 mi) SSW earthquakes near Ceiba Municipio
Loíza Municipio, PR 117 km (73 mi) SW earthquakes near Loíza Municipio

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

Aftershocks so far

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

  1. 3.5 65 km N of Charlotte Amalie, U.S. Virgin Islands
  2. 3.1 74 km NNW of Charlotte Amalie, U.S. Virgin Islands
  3. 3.0 67 km NNE of Luquillo, Puerto Rico
  4. 3.1 62 km N of Culebra, Puerto Rico
  5. 2.7 80 km NNE of Vieques, Puerto Rico
  6. 2.2 77 km NNE of Vieques, Puerto Rico
  7. 2.9 97 km N of Charlotte Amalie, U.S. Virgin Islands
  8. 3.1 107 km NNE of Vieques, Puerto Rico
  9. 3.4 92 km N of Cruz Bay, U.S. Virgin Islands
  10. 2.7 78 km N of Cruz Bay, U.S. Virgin Islands
  11. 2.9 97 km N of Cruz Bay, U.S. Virgin Islands
  12. 3.3 90 km N of Cruz Bay, U.S. Virgin Islands
  13. 3.4 105 km N of Charlotte Amalie, U.S. Virgin Islands
  14. 2.9 102 km N of Charlotte Amalie, U.S. Virgin Islands
  15. 2.9 99 km N of Cruz Bay, U.S. Virgin Islands

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.