QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8md

8 km NNE of Arecibo, Puerto Rico

· 81 km deep · released about 420 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Arecibo Municipio 12 kmHatillo Municipio 16 kmBarceloneta Municipio 17 kmCamuy Municipio 21 kmFlorida Municipio 24 kmManatí Municipio 24 kmQuebradillas Municipio 26 kmUtuado Municipio 30 kmVega Baja Municipio 33 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
81 km below the surface
Felt
no reports yet
Nearest
Arecibo Municipio, 12 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2561 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 420 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 36,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 26,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.3× the energy of this one
  4. This earthquake M 2.8 about 420 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 18.5435, -66.6968. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Arecibo Municipio, PR 12 km (8 mi) N of here earthquakes near Arecibo Municipio
Hatillo Municipio, PR 16 km (10 mi) NE of here earthquakes near Hatillo Municipio
Barceloneta Municipio, PR 17 km (10 mi) WNW of here earthquakes near Barceloneta Municipio
Camuy Municipio, PR 21 km (13 mi) ENE of here earthquakes near Camuy Municipio
Florida Municipio, PR 24 km (15 mi) NW of here earthquakes near Florida Municipio
Manatí Municipio, PR 24 km (15 mi) WNW of here earthquakes near Manatí Municipio

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

Aftershocks so far

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

  1. 2.6 44 km N of Hatillo, Puerto Rico
  2. 2.9 Mona Passage
  3. 1.8 16 km NNW of Camuy, Puerto Rico
  4. 1.6 2 km NW of Maricao, Puerto Rico
  5. 2.6 48 km N of Arecibo, Puerto Rico
  6. 2.7 48 km N of Arecibo, Puerto Rico
  7. 2.6 51 km N of Arecibo, Puerto Rico
  8. 2.6 37 km N of Hatillo, Puerto Rico
  9. 2.5 4 km SSE of Cacao, Puerto Rico
  10. 1.9 3 km SW of San Sebastián, Puerto Rico
  11. 2.7 36 km NNE of Isabela, Puerto Rico
  12. 2.5 46 km NNE of Isabela, Puerto Rico
  13. 2.6 24 km N of San Antonio, Puerto Rico
  14. 3.1 45 km NNE of Isabela, Puerto Rico
  15. 2.5 25 km NNE of Brenas, 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 4.4 on 2018-12-09 — it released about 290 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.