QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8md

10 km NNE of Isabel Segunda, Puerto Rico

· 4.1 km deep · released about 460 lb of TNT

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10 km30 km60 km120 km N Vieques Municipio 12 kmCulebra Municipio 14 kmCeiba Municipio 24 kmFajardo Municipio 27 kmNaguabo Municipio 36 kmLuquillo Municipio 37 kmHumacao Municipio 43 kmRío Grande Municipio 46 kmLas Piedras Municipio 50 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 2.8 (md)
Depth
4.1 km below the surface
Felt
no reports yet
Nearest
Vieques Municipio, 12 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 884 days ago

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 460 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 33,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 23,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.1× the energy of this one
  4. This earthquake M 2.8 about 460 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.

Where

Epicentre 18.2298, -65.3958. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Vieques Municipio, PR 12 km (8 mi) NNE of here earthquakes near Vieques Municipio
Culebra Municipio, PR 14 km (9 mi) SW of here earthquakes near Culebra Municipio
Ceiba Municipio, PR 24 km (15 mi) E of here earthquakes near Ceiba Municipio
Fajardo Municipio, PR 27 km (17 mi) SE of here earthquakes near Fajardo Municipio
Naguabo Municipio, PR 36 km (22 mi) E of here earthquakes near Naguabo Municipio
Luquillo Municipio, PR 37 km (23 mi) ESE of here earthquakes near Luquillo 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. 3.0 6 km E of Esperanza, Puerto Rico
  2. 2.7 29 km SSW of Esperanza, Puerto Rico
  3. 3.5 11 km SSE of Daguao, Puerto Rico
  4. 3.2 3 km SE of Bartolo, Puerto Rico
  5. 3.2 25 km NNE of Luquillo, Puerto Rico
  6. 2.8 28 km SE of El Negro, Puerto Rico
  7. 2.4 11 km SSE of Punta Santiago, Puerto Rico
  8. 3.4 14 km SE of Esperanza, Puerto Rico
  9. 3.2 17 km SE of Esperanza, Puerto Rico
  10. 2.9 14 km SE of Esperanza, Puerto Rico
  11. 3.2 19 km SSE of Esperanza, Puerto Rico
  12. 3.0 14 km SE of Esperanza, Puerto Rico
  13. 3.0 15 km SE of Esperanza, Puerto Rico
  14. 3.6 17 km SE of Esperanza, Puerto Rico
  15. 3.4 14 km SE of Esperanza, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.8 on 2021-10-08 — it released about 1,000 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.