QuakeIndex

Earthquake · reviewed by a seismologist

M 2.5md

Earthquake near Arecibo, PR

No earthquake was likely felt in Arecibo in the 24 hours to 12:08 pm AST (16:08 UTC). The last one was M 3.4, 49 km (31 mi) NW, at 9:00 pm AST on 27 October 2026, estimated intensity II (weak) in town. Every earthquake near Arecibo

This page: a magnitude 2.5 earthquake was recorded 18 km (11 mi) north of Arecibo, PR, at 6:52 am AST on 29 December 2017 (10:52 UTC), 13 km deep.

USGS: 18 km N of Arecibo, Puerto Rico

71 km (44 mi) WNW of San Juan, PR · 20 km (13 mi) NNE of Arecibo, PR

6:52 am AST, Dec 29, 2017 · · 13 km deep · released about 140 lb of TNT

Every earthquake near Arecibo Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Arecibo Municipio 22 kmBarceloneta Municipio 23 kmHatillo Municipio 24 kmCamuy Municipio 28 kmManatí Municipio 30 kmQuebradillas Municipio 31 kmFlorida Municipio 33 kmVega Baja Municipio 37 kmIsabela Municipio 38 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
6:52 am AST on 29 December 2017 ()
Where
18 km (11 mi) north of Arecibo, PR · earthquakes near Arecibo
Magnitude
M 2.5 (md)
Depth
13 km below the surface
Felt
no reports yet
Nearest
Arecibo Municipio, 22 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3239 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

At this magnitude and depth, people at rest would likely notice it out to about 17 km (11 mi) from the epicentre. In Arecibo, 18 km away, the estimate is intensity II (weak). Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.

Earthquakes near other towns within 30 km: Carrizales, Corcovado, Hatillo, Animas, Bajadero, Camuy.

How big was it?

This earthquake released about 140 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 110,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 75,000× the energy of this one
  3. Around the size people start to feel M 3.0 6.7× the energy of this one
  4. This earthquake M 2.5 about 140 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.

For this area

The largest earthquake within 50 km since 2016 was M 4.0 on 2017-03-24 — about 210 times the energy of this one.

Before 2016, the USGS record lists 6 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.4 61 km N of Hatillo, Puerto Rico · 47 km NNW of this epicentre
  2. 5.8 12 km N of Garrochales, Puerto Rico · 16 km ESE of this epicentre
  3. 5.8 4 km E of Moca, Puerto Rico · 48 km WSW of this epicentre
  4. 5.6 57 km N of Isabela, Puerto Rico · 49 km NNW of this epicentre
  5. 5.5 Puerto Rico region · 49 km NNW of this epicentre

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Epicentre 18.6343, -66.6925. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Arecibo Municipio, PR 22 km (14 mi) S earthquakes near Arecibo Municipio
Barceloneta Municipio, PR 23 km (14 mi) SE earthquakes near Barceloneta Municipio
Hatillo Municipio, PR 24 km (15 mi) SSW earthquakes near Hatillo Municipio
Camuy Municipio, PR 28 km (17 mi) SW earthquakes near Camuy Municipio
Manatí Municipio, PR 30 km (18 mi) SE earthquakes near Manatí Municipio
Quebradillas Municipio, PR 31 km (19 mi) SW earthquakes near Quebradillas Municipio

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

Aftershocks so far

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

  1. 2.9 61 km N of Tierras Nuevas Poniente, Puerto Rico
  2. 2.4 7 km NNE of Garrochales, Puerto Rico
  3. 2.6 64 km N of Tierras Nuevas Poniente, Puerto Rico
  4. 2.9 57 km N of Tierras Nuevas Poniente, Puerto Rico
  5. 2.5 23 km NNW of Tierras Nuevas Poniente, Puerto Rico
  6. 1.8 20 km NNW of Isabela, Puerto Rico
  7. 2.7 18 km NNE of Carrizales, Puerto Rico
  8. 3.1 14 km NNW of Camuy, Puerto Rico
  9. 2.6 37 km N of Tierras Nuevas Poniente, Puerto Rico
  10. 2.8 41 km N of Brenas, Puerto Rico
  11. 3.2 6 km ENE of Jayuya, Puerto Rico
  12. 2.7 2 km SW of Toa Baja, Puerto Rico
  13. 2.4 15 km N of Quebradillas, Puerto Rico
  14. 3.0 4 km W of Ciales, Puerto Rico
  15. 2.8 49 km N of Isabela, 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.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.