QuakeIndex

Earthquake · reviewed by a seismologist

M 2.3md

102 km NNE of Vieques, Puerto Rico

Yes. A magnitude 2.3 earthquake was recorded 102 km NNE of Vieques, Puerto Rico, at 5:04 pm AST on 28 June 2017 (21:04 UTC), 16 km deep.

· 16 km deep · released about 91 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Fajardo Municipio 99 kmLuquillo Municipio 104 kmCulebra Municipio 105 kmLoíza Municipio 106 kmRío Grande Municipio 106 kmCarolina Municipio 112 kmCeiba Municipio 114 kmCanóvanas Municipio 114 kmSan Juan Municipio 115 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 2.3 (md)
Depth
16 km below the surface
Felt
no reports yet
Nearest
Fajardo Municipio, 99 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3422 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 12 km (7 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 91 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 170,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 120,000× the energy of this one
  3. Around the size people start to feel M 3.0 10× the energy of this one
  4. This earthquake M 2.3 about 91 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 4.3 on 2016-09-04 — about 930 times the energy of this one.

Before 2016, the USGS record lists 4 earthquakes of M5 or more within 50 km:

  1. 5.1 122 km NNE of Vieques, Puerto Rico · 21 km NE of this epicentre
  2. 5.1 92 km N of Suárez, Puerto Rico · 30 km W of this epicentre
  3. 5.0 109 km N of Charlotte Amalie, U.S. Virgin Islands · 44 km E of this epicentre
  4. 5.0 73 km NNE of Vieques, Puerto Rico · 30 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 19.2668, -65.4350. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Fajardo Municipio, PR 99 km (62 mi) S earthquakes near Fajardo Municipio
Luquillo Municipio, PR 104 km (65 mi) SSW earthquakes near Luquillo Municipio
Culebra Municipio, PR 105 km (65 mi) S earthquakes near Culebra Municipio
Loíza Municipio, PR 106 km (66 mi) SSW earthquakes near Loíza Municipio
Río Grande Municipio, PR 106 km (66 mi) SSW earthquakes near Río Grande Municipio
Carolina Municipio, PR 112 km (70 mi) SSW earthquakes near Carolina Municipio

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

Aftershocks so far

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

  1. 3.4 67 km NNE of Suárez, Puerto Rico
  2. 2.1 76 km NNW of Charlotte Amalie, U.S. Virgin Islands
  3. 2.3 78 km NNE of Vieques, Puerto Rico
  4. 2.8 56 km NNE of Luquillo, Puerto Rico
  5. 2.1 75 km N of Culebra, Puerto Rico
  6. 2.5 100 km N of Suárez, Puerto Rico
  7. 2.7 71 km NNW of Charlotte Amalie, U.S. Virgin Islands
  8. 2.8 131 km N of Culebra, Puerto Rico
  9. 3.4 80 km N of Culebra, Puerto Rico
  10. 2.6 127 km NNE of Vieques, Puerto Rico
  11. 3.1 84 km NNE of Suárez, Puerto Rico
  12. 3.1 109 km N of Suárez, Puerto Rico
  13. 2.8 96 km NNE of Suárez, Puerto Rico
  14. 1.9 86 km NNW of Charlotte Amalie, U.S. Virgin Islands
  15. 3.1 74 km N of Culebra, Puerto Rico

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.