QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8md

2 km SE of Bufalo, Puerto Rico

· 106 km deep · released about 530 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Florida Municipio 4 kmBarceloneta Municipio 7 kmManatí Municipio 8 kmArecibo Municipio 13 kmCiales Municipio 13 kmMorovis Municipio 17 kmVega Baja Municipio 18 kmUtuado Municipio 21 kmJayuya Municipio 22 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
106 km below the surface
Felt
no reports yet
Nearest
Florida Municipio, 4 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2670 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 530 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 29,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 20,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.8× the energy of this one
  4. This earthquake M 2.8 about 530 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 18.4041, -66.5578. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Florida Municipio, PR 4 km (2 mi) N of here earthquakes near Florida Municipio
Barceloneta Municipio, PR 7 km (5 mi) S of here earthquakes near Barceloneta Municipio
Manatí Municipio, PR 8 km (5 mi) WSW of here earthquakes near Manatí Municipio
Arecibo Municipio, PR 13 km (8 mi) ESE of here earthquakes near Arecibo Municipio
Ciales Municipio, PR 13 km (8 mi) NNW of here earthquakes near Ciales Municipio
Morovis Municipio, PR 17 km (11 mi) WNW of here earthquakes near Morovis Municipio

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

Aftershocks so far

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

  1. 1.9 6 km NNW of Santo Domingo, Puerto Rico
  2. 1.7 11 km NE of Sabana Grande, Puerto Rico
  3. 2.0 12 km NNW of Hatillo, Puerto Rico
  4. 1.6 1 km NW of Coto Laurel, Puerto Rico
  5. 2.4 Puerto Rico region
  6. 2.0 2 km WSW of Palomas, Puerto Rico
  7. 2.1 3 km NW of Quebradillas, Puerto Rico
  8. 1.7 2 km NNE of Yauco, Puerto Rico
  9. 1.8 2 km N of Yauco, Puerto Rico
  10. 2.3 3 km ENE of Isabela, Puerto Rico
  11. 2.3 22 km N of Arecibo, Puerto Rico
  12. 1.6 7 km SE of Jayuya, Puerto Rico
  13. 1.6 6 km ESE of Jayuya, Puerto Rico
  14. 1.7 2 km S of Capitanejo, Puerto Rico
  15. 1.8 2 km N of Playita Cortada, 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 230 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.