QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8md

51 km N of Brenas, Puerto Rico

· 12 km deep · released about 400 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Dorado Municipio 51 kmVega Baja Municipio 53 kmToa Baja Municipio 55 kmVega Alta Municipio 55 kmBarceloneta Municipio 56 kmManatí Municipio 56 kmCataño Municipio 58 kmSan Juan Municipio 63 kmToa Alta Municipio 64 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
12 km below the surface
Felt
no reports yet
Nearest
Dorado Municipio, 51 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3204 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 400 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 38,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 27,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.4× the energy of this one
  4. This earthquake M 2.8 about 400 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 18.9298, -66.3401. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Dorado Municipio, PR 51 km (32 mi) N of here earthquakes near Dorado Municipio
Vega Baja Municipio, PR 53 km (33 mi) N of here earthquakes near Vega Baja Municipio
Toa Baja Municipio, PR 55 km (34 mi) NNW of here earthquakes near Toa Baja Municipio
Vega Alta Municipio, PR 55 km (34 mi) N of here earthquakes near Vega Alta Municipio
Barceloneta Municipio, PR 56 km (35 mi) NNE of here earthquakes near Barceloneta Municipio
Manatí Municipio, PR 56 km (35 mi) NNE of here earthquakes near Manatí 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. 3.1 18 km NNW of Brenas, Puerto Rico
  2. 3.2 40 km N of Arecibo, Puerto Rico
  3. 2.9 53 km NNW of San Juan, Puerto Rico
  4. 2.8 68 km N of Tierras Nuevas Poniente, Puerto Rico
  5. 3.0 77 km N of Tierras Nuevas Poniente, Puerto Rico
  6. 3.2 73 km N of Tierras Nuevas Poniente, Puerto Rico
  7. 2.3 33 km N of Arecibo, Puerto Rico
  8. 3.1 62 km N of Loíza, Puerto Rico
  9. 2.9 66 km NNE of Arecibo, Puerto Rico
  10. 3.2 41 km N of Brenas, Puerto Rico
  11. 2.5 48 km N of Carrizales, Puerto Rico
  12. 2.7 26 km NNW of Brenas, Puerto Rico
  13. 3.2 57 km N of San Juan, Puerto Rico
  14. 2.6 5 km N of Brenas, Puerto Rico
  15. 2.7 72 km N of Tierras Nuevas Poniente, 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 2017-08-18 — it released about 1,200 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.