QuakeIndex

Earthquake · reviewed by a seismologist

M 3.5md

12 km NNE of Arecibo, Puerto Rico

· 26 km deep · released about 2.3 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Arecibo Municipio 17 kmBarceloneta Municipio 19 kmHatillo Municipio 19 kmCamuy Municipio 24 kmManatí Municipio 26 kmFlorida Municipio 27 kmQuebradillas Municipio 28 kmVega Baja Municipio 34 kmUtuado Municipio 35 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 3.5 (md)
Depth
26 km below the surface
Felt
7 reports · strongest reported intensity IV
Measured shaking
intensity II (ShakeMap)
Nearest
Arecibo Municipio, 17 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1220 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 7 people have reported feeling it to USGS.

How big was it?

This earthquake released about 2.3 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.5 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 72,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 3,200× the energy of this one
  3. Magna, Utah 2020 M 5.7 2,300× the energy of this one
  4. This earthquake M 3.5 about 2.3 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 4.9× 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 18.5820, -66.6910. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Arecibo Municipio, PR 17 km (10 mi) N of here earthquakes near Arecibo Municipio
Barceloneta Municipio, PR 19 km (12 mi) NW of here earthquakes near Barceloneta Municipio
Hatillo Municipio, PR 19 km (12 mi) NE of here earthquakes near Hatillo Municipio
Camuy Municipio, PR 24 km (15 mi) NE of here earthquakes near Camuy Municipio
Manatí Municipio, PR 26 km (16 mi) NW of here earthquakes near Manatí Municipio
Florida Municipio, PR 27 km (17 mi) NNW 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. 2.1 5 km S of Utuado, Puerto Rico
  2. 3.3 31 km N of Tierras Nuevas Poniente, Puerto Rico
  3. 3.3 7 km NNW of Brenas, Puerto Rico
  4. 2.2 4 km ENE of Maricao, Puerto Rico
  5. 3.2 1 km NE of Hatillo, Puerto Rico
  6. 2.0 8 km S of Lares, Puerto Rico
  7. 2.3 8 km W of Orocovis, Puerto Rico
  8. 2.9 7 km NE of Maricao, Puerto Rico
  9. 3.1 Puerto Rico region
  10. 2.7 4 km SSE of Ciales, Puerto Rico
  11. 2.6 5 km NE of Animas, Puerto Rico
  12. 3.3 7 km NNE of Dorado, Puerto Rico
  13. 2.8 Puerto Rico region
  14. 2.3 5 km WNW of Orocovis, Puerto Rico
  15. 2.9 30 km N of Arecibo, 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 26 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.