QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

Earthquake near Quebradillas, PR

No earthquake was likely felt in Quebradillas in the 24 hours to 6:06 pm AST (22:06 UTC). The last one was M 3.4, 36 km (22 mi) NNW, at 9:00 pm AST on 27 October 2026, estimated intensity II (weak) in town. Every earthquake near Quebradillas

This page: a magnitude 2.1 earthquake was recorded 15 km (10 mi) north of Quebradillas, PR, at 7:23 pm AST on 28 June 2018 (23:23 UTC), 27 km deep.

USGS: 15 km N of Quebradillas, Puerto Rico

94 km (58 mi) WNW of San Juan, PR · 26 km (16 mi) NW of Arecibo, PR

7:23 pm AST, Jun 28, 2018 · · 27 km deep · released about 44 lb of TNT

Every earthquake near Quebradillas Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Quebradillas Municipio 16 kmIsabela Municipio 17 kmCamuy Municipio 20 kmHatillo Municipio 23 kmAguadilla Municipio 27 kmMoca Municipio 31 kmSan Sebastián Municipio 32 kmArecibo Municipio 33 kmLares 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
7:23 pm AST on 28 June 2018 ()
Where
15 km (10 mi) north of Quebradillas, PR · earthquakes near Quebradillas
Magnitude
M 2.1 (md)
Depth
27 km below the surface
Felt
no reports yet
Nearest
Quebradillas Municipio, 16 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3058 days ago

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

At this magnitude and depth it was probably too small to be felt, even directly above it. In Quebradillas, 15 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: Isabela, Camuy, Hatillo, Cacao, Piedra Gorda, Carrizales.

How big was it?

This earthquake released about 44 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 340,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 240,000× the energy of this one
  3. Around the size people start to feel M 3.0 22× the energy of this one
  4. This earthquake M 2.1 about 44 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

No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.

Before 2016, the USGS record lists 14 earthquakes of M5 or more within 50 km; the five largest:

  1. 7.7 45 km N of San Antonio, Puerto Rico · 39 km NNW of this epicentre
  2. 7.1 24 km NNW of San Antonio, Puerto Rico · 30 km WNW of this epicentre
  3. 6.4 32 km NW of Aguadilla, Puerto Rico · 49 km W of this epicentre
  4. 6.4 61 km N of Hatillo, Puerto Rico · 49 km NNE of this epicentre
  5. 6.3 6 km WNW of Aguadilla, Puerto Rico · 36 km WSW 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 18.6120, -66.9231. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Quebradillas Municipio, PR 16 km (10 mi) S earthquakes near Quebradillas Municipio
Isabela Municipio, PR 17 km (11 mi) SW earthquakes near Isabela Municipio
Camuy Municipio, PR 20 km (12 mi) SSE earthquakes near Camuy Municipio
Hatillo Municipio, PR 23 km (14 mi) SE earthquakes near Hatillo Municipio
Aguadilla Municipio, PR 27 km (17 mi) WSW earthquakes near Aguadilla Municipio
Moca Municipio, PR 31 km (19 mi) SSW earthquakes near Moca Municipio

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

Aftershocks so far

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

  1. 1.7 2 km NNE of Mayagüez, Puerto Rico
  2. 1.9 9 km SSE of Lares, Puerto Rico
  3. 3.2 Puerto Rico region
  4. 2.4 5 km NW of Rincón, Puerto Rico
  5. 2.2 29 km NNE of Arecibo, Puerto Rico
  6. 2.5 11 km N of Carrizales, Puerto Rico
  7. 2.2 15 km NNE of Isabela, Puerto Rico
  8. 2.8 45 km N of Isabela, Puerto Rico
  9. 2.5 3 km ENE of Isabela, Puerto Rico
  10. 2.1 3 km WNW of Maricao, Puerto Rico
  11. 2.4 2 km ENE of Isabela, Puerto Rico
  12. 2.6 3 km NE of Quebradillas, Puerto Rico
  13. 2.5 41 km N of Isabela, Puerto Rico
  14. 2.0 4 km SSW of Añasco, Puerto Rico
  15. 1.9 6 km W of Las Marías, 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.