QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8md

Earthquake near Arecibo, PR

No earthquake was likely felt in Arecibo in the 24 hours to 11:29 am AST (15:29 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 2.8 earthquake was recorded 28 km (17 mi) north of Arecibo, PR, at 9:20 pm AST on 13 April 2018 (01:20 UTC), 9.0 km deep.

USGS: 27 km N of Arecibo, Puerto Rico

76 km (47 mi) WNW of San Juan, PR · 30 km (18 mi) N of Arecibo, PR

9:20 pm AST, Apr 13, 2018 · · 9.0 km deep · released about 550 lb of TNT

Every earthquake near Arecibo Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Barceloneta Municipio 32 kmArecibo Municipio 32 kmHatillo Municipio 33 kmCamuy Municipio 35 kmQuebradillas Municipio 37 kmManatí Municipio 38 kmFlorida Municipio 42 kmIsabela Municipio 42 kmVega Baja Municipio 44 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
9:20 pm AST on 13 April 2018 ()
Where
28 km (17 mi) north of Arecibo, PR · earthquakes near Arecibo
Magnitude
M 2.8 (md)
Depth
9.0 km below the surface
Felt
no reports yet
Nearest
Barceloneta Municipio, 32 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3050 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

At this magnitude and depth, people at rest would likely notice it out to about 28 km (17 mi) from the epicentre. In Arecibo, 28 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.

Likely felt in: Arecibo 28 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 550 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 28,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 19,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.7× the energy of this one
  4. This earthquake M 2.8 about 550 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 4.8 on 2017-08-18 — about 870 times the energy of this one.

Before 2016, the USGS record lists 10 earthquakes of M5 or more within 50 km; the five largest:

  1. 7.7 45 km N of San Antonio, Puerto Rico · 48 km WNW of this epicentre
  2. 6.4 61 km N of Hatillo, Puerto Rico · 38 km NNW of this epicentre
  3. 5.8 12 km N of Garrochales, Puerto Rico · 23 km SE of this epicentre
  4. 5.6 57 km N of Isabela, Puerto Rico · 40 km NW of this epicentre
  5. 5.5 64 km N of Tierras Nuevas Poniente, Puerto Rico · 43 km NNE 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 18.7201, -66.7021. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Barceloneta Municipio, PR 32 km (20 mi) SSE earthquakes near Barceloneta Municipio
Arecibo Municipio, PR 32 km (20 mi) S earthquakes near Arecibo Municipio
Hatillo Municipio, PR 33 km (20 mi) SSW earthquakes near Hatillo Municipio
Camuy Municipio, PR 35 km (22 mi) SSW earthquakes near Camuy Municipio
Quebradillas Municipio, PR 37 km (23 mi) SW earthquakes near Quebradillas Municipio
Manatí Municipio, PR 38 km (23 mi) SE earthquakes near Manatí Municipio

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

Aftershocks so far

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

  1. 2.5 12 km NNE of Brenas, Puerto Rico
  2. 1.9 9 km NNW of Garrochales, Puerto Rico
  3. 2.8 4 km N of Barceloneta, Puerto Rico
  4. 2.6 29 km N of Hatillo, Puerto Rico
  5. 2.5 4 km NNW of Arecibo, Puerto Rico
  6. 2.3 63 km N of Tierras Nuevas Poniente, Puerto Rico
  7. 1.6 20 km N of Hatillo, Puerto Rico
  8. 2.7 50 km N of Tierras Nuevas Poniente, Puerto Rico
  9. 2.1 56 km N of Tierras Nuevas Poniente, Puerto Rico
  10. 2.4 14 km NNW of Isabela, Puerto Rico
  11. 2.4 12 km N of Arecibo, Puerto Rico
  12. 2.2 19 km N of Arecibo, Puerto Rico
  13. 2.8 61 km N of Isabela, Puerto Rico
  14. 2.8 61 km N of Hatillo, Puerto Rico
  15. 2.6 27 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.

On USGS

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