QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

7 km N of Arecibo, Puerto Rico

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

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10 km30 km60 km120 km N Arecibo Municipio 13 kmHatillo Municipio 13 kmCamuy Municipio 18 kmBarceloneta Municipio 19 kmQuebradillas Municipio 23 kmFlorida Municipio 26 kmManatí Municipio 27 kmUtuado Municipio 30 kmIsabela Municipio 31 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
114 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Arecibo Municipio, 13 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2177 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 18.5393, -66.7253. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Arecibo Municipio, PR 13 km (8 mi) NNW of here earthquakes near Arecibo Municipio
Hatillo Municipio, PR 13 km (8 mi) NE of here earthquakes near Hatillo Municipio
Camuy Municipio, PR 18 km (11 mi) NE of here earthquakes near Camuy Municipio
Barceloneta Municipio, PR 19 km (12 mi) WNW of here earthquakes near Barceloneta Municipio
Quebradillas Municipio, PR 23 km (14 mi) ENE of here earthquakes near Quebradillas Municipio
Florida Municipio, PR 26 km (16 mi) NW of here earthquakes near Florida Municipio

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

Aftershocks so far

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

  1. 2.8 Puerto Rico region
  2. 2.8 39 km N of Isabela, Puerto Rico
  3. 2.1 3 km ESE of Espino, Puerto Rico
  4. 2.4 7 km NNE of Quebradillas, Puerto Rico
  5. 1.9 5 km ESE of Las Marías, Puerto Rico
  6. 1.7 3 km NNE of Maricao, Puerto Rico
  7. 1.6 6 km SSE of Adjuntas, Puerto Rico
  8. 2.4 19 km N of Camuy, Puerto Rico
  9. 3.3 13 km NNE of Carrizales, Puerto Rico
  10. 2.4 4 km SSE of Moca, Puerto Rico
  11. 1.8 2 km SSE of Maricao, Puerto Rico
  12. 2.2 1 km WSW of Maricao, Puerto Rico
  13. 2.0 5 km NNE of Carrizales, Puerto Rico
  14. 1.8 2 km SE of Maricao, Puerto Rico
  15. 2.1 1 km WNW of Vega Baja, 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 86 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.