QuakeIndex

Earthquake · reviewed by a seismologist

M 3.0md

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

Yes. A magnitude 3.0 earthquake was recorded 93 km NNW of Charlotte Amalie, U.S. Virgin Islands, at 4:40 am AST on 9 August 2019 (08:40 UTC), 71 km deep.

· 71 km deep · released about 860 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Culebra Municipio 96 kmFajardo Municipio 100 kmLuquillo Municipio 108 kmRío Grande Municipio 113 kmCeiba Municipio 114 kmLoíza Municipio 118 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 3.0 (md)
Depth
71 km below the surface
Felt
no reports yet
Nearest
Culebra Municipio, 96 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2570 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 860 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 390,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 18,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 12,000× the energy of this one
  4. This earthquake M 3.0 about 860 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 4.8 on 2019-02-18 — about 560 times the energy of this one.

Before 2016, the USGS record lists 10 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.1 91 km N of Charlotte Amalie, U.S. Virgin Islands · 31 km E of this epicentre
  2. 6.0 112 km N of Charlotte Amalie, U.S. Virgin Islands · 29 km NE of this epicentre
  3. 5.6 112 km N of Charlotte Amalie, U.S. Virgin Islands · 32 km NE of this epicentre
  4. 5.2 99 km N of Cruz Bay, U.S. Virgin Islands · 47 km E of this epicentre
  5. 5.1 107 km N of Charlotte Amalie, U.S. Virgin Islands · 24 km NE 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 19.1695, -65.1250. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Culebra Municipio, PR 96 km (59 mi) SSW earthquakes near Culebra Municipio
Fajardo Municipio, PR 100 km (62 mi) SSW earthquakes near Fajardo Municipio
Luquillo Municipio, PR 108 km (67 mi) SW earthquakes near Luquillo Municipio
Río Grande Municipio, PR 113 km (70 mi) SW earthquakes near Río Grande Municipio
Ceiba Municipio, PR 114 km (71 mi) SSW earthquakes near Ceiba Municipio
Loíza Municipio, PR 118 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

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

  1. 3.2 130 km NNE of Vieques, Puerto Rico
  2. 2.6 82 km N of Culebra, Puerto Rico
  3. 2.3 57 km N of Culebra, Puerto Rico
  4. 3.4 102 km N of Cruz Bay, U.S. Virgin Islands
  5. 3.4 85 km N of Cruz Bay, U.S. Virgin Islands
  6. 3.1 94 km N of Cruz Bay, U.S. Virgin Islands
  7. 2.7 83 km N of Cruz Bay, U.S. Virgin Islands
  8. 2.6 89 km N of Charlotte Amalie, U.S. Virgin Islands
  9. 3.5 96 km N of Cruz Bay, U.S. Virgin Islands
  10. 3.3 92 km N of Cruz Bay, U.S. Virgin Islands
  11. 3.6 102 km N of Cruz Bay, U.S. Virgin Islands
  12. 3.5 107 km N of Cruz Bay, U.S. Virgin Islands
  13. 3.4 92 km N of Cruz Bay, U.S. Virgin Islands
  14. 2.9 97 km N of Cruz Bay, U.S. Virgin Islands
  15. 3.4 74 km N of Charlotte Amalie, 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.