QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

Earthquake near Aguadilla, PR

No earthquake was likely felt in Aguadilla in the 24 hours to 12:10 pm AST (16:10 UTC). The last one was M 3.5, 4 km (3 mi) SE, at 12:03 am AST on 6 November 2026, estimated intensity II (weak) in town. Every earthquake near Aguadilla

This page: a magnitude 2.1 earthquake was recorded 43 km (27 mi) west-northwest of Aguadilla, PR, at 8:09 am AST on 8 December 2019 (12:09 UTC), 13 km deep.

USGS: 39 km NW of Rincón, Puerto Rico

58 km (36 mi) NW of Mayagüez, PR · 146 km (91 mi) W of Bayamón, PR

8:09 am AST, Dec 8, 2019 · · 13 km deep · released about 49 lb of TNT

Every earthquake near Aguadilla Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Rincón Municipio 39 kmAguadilla Municipio 42 kmAguada Municipio 42 kmMoca Municipio 52 kmAñasco Municipio 53 kmIsabela Municipio 55 kmQuebradillas Municipio 65 kmSan Sebastián Municipio 65 kmHormigueros Municipio 65 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
8:09 am AST on 8 December 2019 ()
Where
43 km (27 mi) west-northwest of Aguadilla, PR · earthquakes near Aguadilla
Magnitude
M 2.1 (md)
Depth
13 km below the surface
Felt
no reports yet
Nearest
Rincón Municipio, 39 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2530 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 12 km (7 mi) from the epicentre. In Aguadilla, 43 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.

How big was it?

This earthquake released about 49 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 5.8 310,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 220,000× the energy of this one
  3. Around the size people start to feel M 3.0 19× the energy of this one
  4. This earthquake M 2.1 about 49 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 4.4 on 2017-10-01 — about 2,500 times the energy of this one.

Before 2016, the USGS record lists 12 earthquakes of M5 or more within 50 km; the five largest:

  1. 7.1 24 km NNW of San Antonio, Puerto Rico · 39 km ENE of this epicentre
  2. 6.4 32 km NW of Aguadilla, Puerto Rico · 16 km ENE of this epicentre
  3. 6.3 6 km WNW of Aguadilla, Puerto Rico · 36 km ESE of this epicentre
  4. 6.3 58 km E of Punta Cana, Dominican Republic · 35 km WSW of this epicentre
  5. 6.1 15 km WNW of San Antonio, Puerto Rico · 32 km E 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 18.5690, -67.5318. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Rincón Municipio, PR 39 km (24 mi) SE earthquakes near Rincón Municipio
Aguadilla Municipio, PR 42 km (26 mi) ESE earthquakes near Aguadilla Municipio
Aguada Municipio, PR 42 km (26 mi) ESE earthquakes near Aguada Municipio
Moca Municipio, PR 52 km (32 mi) ESE earthquakes near Moca Municipio
Añasco Municipio, PR 53 km (33 mi) SE earthquakes near Añasco Municipio
Isabela Municipio, PR 55 km (34 mi) E earthquakes near Isabela Municipio

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

Aftershocks so far

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

  1. 2.6 75 km NW of San Antonio, Puerto Rico
  2. 2.3 33 km NNW of San Antonio, Puerto Rico
  3. 3.2 55 km W of Rincón, Puerto Rico
  4. 2.7 36 km WNW of Rincón, Puerto Rico
  5. 2.8 67 km ENE of Punta Cana, Dominican Republic
  6. 3.3 23 km WSW of Stella, Puerto Rico
  7. 3.2 44 km NNW of San Antonio, Puerto Rico
  8. 2.7 42 km NW of San Antonio, Puerto Rico
  9. 2.2 14 km NNW of San Antonio, Puerto Rico
  10. 2.5 48 km NNW of San Antonio, Puerto Rico
  11. 3.2 80 km NW of San Antonio, Puerto Rico
  12. 2.6 77 km NW of San Antonio, Puerto Rico
  13. 3.6 72 km NW of San Antonio, Puerto Rico
  14. 2.4 36 km NNW of San Antonio, Puerto Rico
  15. 3.0 Mona Passage

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.