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 6:38 am AST (10:38 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 19 km (12 mi) west-northwest of Arecibo, PR, at 8:24 pm AST on 4 August 2022 (00:24 UTC), 17 km deep.

USGS: Puerto Rico region

87 km (54 mi) WNW of San Juan, PR · 19 km (12 mi) NW of Arecibo, PR

8:24 pm AST, Aug 4, 2022 · · 17 km deep · released about 150 lb of TNT

Every earthquake near Arecibo Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Quebradillas Municipio 13 kmCamuy Municipio 14 kmHatillo Municipio 16 kmIsabela Municipio 18 kmArecibo Municipio 25 kmSan Sebastián Municipio 28 kmAguadilla Municipio 30 kmMoca Municipio 31 kmLares Municipio 32 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
8:24 pm AST on 4 August 2022 ()
Where
19 km (12 mi) west-northwest of Arecibo, PR · earthquakes near Arecibo
Magnitude
M 2.5 (md)
Depth
17 km below the surface
Felt
no reports yet
Nearest
Quebradillas Municipio, 13 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1559 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 14 km (9 mi) from the epicentre. In Arecibo, 19 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: Hatillo 10 km, intensity II · Quebradillas 13 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 150 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 5.8 100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 72,000× the energy of this one
  3. Around the size people start to feel M 3.0 6.5× the energy of this one
  4. This earthquake M 2.5 about 150 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.

Where

Epicentre 18.5687, -66.8700. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Quebradillas Municipio, PR 13 km (8 mi) SSW earthquakes near Quebradillas Municipio
Camuy Municipio, PR 14 km (9 mi) S earthquakes near Camuy Municipio
Hatillo Municipio, PR 16 km (10 mi) SSE earthquakes near Hatillo Municipio
Isabela Municipio, PR 18 km (11 mi) WSW earthquakes near Isabela Municipio
Arecibo Municipio, PR 25 km (16 mi) SE earthquakes near Arecibo Municipio
San Sebastián Municipio, PR 28 km (18 mi) SSW earthquakes near San Sebastián Municipio

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

Aftershocks so far

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

  1. 2.5 Mona Passage
  2. 3.7 23 km NNE of Isabela, Puerto Rico
  3. 2.3 6 km WSW of Adjuntas, Puerto Rico
  4. 2.8 11 km N of Isabela, Puerto Rico
  5. 2.1 3 km NW of Maricao, Puerto Rico
  6. 2.8 36 km NNE of Arecibo, Puerto Rico
  7. 3.0 19 km N of Isabela, Puerto Rico
  8. 3.0 3 km NE of Las Marias, Puerto Rico
  9. 2.4 11 km N of Quebradillas, Puerto Rico
  10. 2.6 Mona Passage
  11. 3.6 Puerto Rico region
  12. 3.1 2 km W of La Playa, Puerto Rico
  13. 2.4 5 km ESE of Las Marías, Puerto Rico
  14. 3.1 31 km NW of San Antonio, Puerto Rico
  15. 2.9 21 km NNW of Camuy, 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.