QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

36 km NNE of Arecibo, Puerto Rico

· 51 km deep · released about 1,400 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Barceloneta Municipio 36 kmArecibo Municipio 40 kmManatí Municipio 41 kmHatillo Municipio 43 kmVega Baja Municipio 45 kmCamuy Municipio 46 kmFlorida Municipio 47 kmQuebradillas Municipio 48 kmVega Alta 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 3.1 (md)
Depth
51 km below the surface
Felt
1 report · strongest reported intensity I
Nearest
Barceloneta Municipio, 36 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 32 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 1,400 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 240,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 11,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 7,700× the energy of this one
  4. This earthquake M 3.1 about 1,400 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.5× more

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 18.7900, -66.6293. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Barceloneta Municipio, PR 36 km (23 mi) NNW of here earthquakes near Barceloneta Municipio
Arecibo Municipio, PR 40 km (25 mi) N of here earthquakes near Arecibo Municipio
Manatí Municipio, PR 41 km (25 mi) NNW of here earthquakes near Manatí Municipio
Hatillo Municipio, PR 43 km (27 mi) NNE of here earthquakes near Hatillo Municipio
Vega Baja Municipio, PR 45 km (28 mi) NNW of here earthquakes near Vega Baja Municipio
Camuy Municipio, PR 46 km (28 mi) NNE of here earthquakes near Camuy Municipio

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

Aftershocks so far

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

  1. 2.8 8 km NNE of Tierras Nuevas Poniente, Puerto Rico
  2. 2.8 13 km NNE of Carrizales, Puerto Rico
  3. 2.5 11 km N of Quebradillas, Puerto Rico
  4. 3.0 15 km N of Arecibo, Puerto Rico
  5. 3.2 27 km N of Isabela, Puerto Rico
  6. 2.9 65 km N of Tierras Nuevas Poniente, Puerto Rico
  7. 2.8 43 km NNE of Arecibo, Puerto Rico
  8. 2.8 10 km NNE of Tierras Nuevas Poniente, Puerto Rico
  9. 2.6 5 km N of Animas, 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 340 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.