QuakeIndex

Earthquake · reviewed by a seismologist

M 3.0md

Earthquake near Isabela, PR

No earthquake was likely felt in Isabela in the 24 hours to 4:45 pm AST (20:45 UTC). The last one was M 3.4, 31 km (19 mi) N, at 9:00 pm AST on 27 October 2026, estimated intensity II (weak) in town. Every earthquake near Isabela

This page: a magnitude 3.0 earthquake was recorded 49 km (30 mi) north-northwest of Isabela, PR, at 12:49 am AST on 10 January 2019 (04:49 UTC), 4.0 km deep.

USGS: 46 km NNW of San Antonio, Puerto Rico

12:49 am AST, Jan 10, 2019 · · 4.0 km deep · released about 1,100 lb of TNT

Every earthquake near Isabela Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Aguadilla Municipio 46 kmIsabela Municipio 51 kmAguada Municipio 56 kmQuebradillas Municipio 58 kmMoca Municipio 59 kmRincón Municipio 59 kmCamuy Municipio 64 kmAñasco Municipio 67 kmSan Sebastián Municipio 68 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
12:49 am AST on 10 January 2019 ()
Where
49 km (30 mi) north-northwest of Isabela, PR · earthquakes near Isabela
Magnitude
M 3.0 (md)
Depth
4.0 km below the surface
Felt
no reports yet
Nearest
Aguadilla Municipio, 46 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2780 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 39 km (24 mi) from the epicentre. In Isabela, 49 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 1,100 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 300,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 13,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 9,400× the energy of this one
  4. This earthquake M 3.0 about 1,100 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 4.3 on 2017-10-14 — about 75 times the energy of this one.

Before 2016, the USGS record lists 18 earthquakes of M5 or more within 50 km; the five largest:

  1. 7.7 45 km N of San Antonio, Puerto Rico · 17 km ENE of this epicentre
  2. 7.1 24 km NNW of San Antonio, Puerto Rico · 21 km SSE of this epicentre
  3. 6.4 32 km NW of Aguadilla, Puerto Rico · 31 km SSW of this epicentre
  4. 6.3 6 km WNW of Aguadilla, Puerto Rico · 48 km S of this epicentre
  5. 6.1 15 km WNW of San Antonio, Puerto Rico · 36 km S 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 18.8718, -67.2766. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Aguadilla Municipio, PR 46 km (28 mi) SSE earthquakes near Aguadilla Municipio
Isabela Municipio, PR 51 km (32 mi) SSE earthquakes near Isabela Municipio
Aguada Municipio, PR 56 km (35 mi) S earthquakes near Aguada Municipio
Quebradillas Municipio, PR 58 km (36 mi) SE earthquakes near Quebradillas Municipio
Moca Municipio, PR 59 km (36 mi) SSE earthquakes near Moca Municipio
Rincón Municipio, PR 59 km (37 mi) S earthquakes near Rincón 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. 2.7 37 km NW of Rincón, Puerto Rico
  2. 2.6 42 km N of Isabela, Puerto Rico
  3. 2.4 42 km NNW of San Antonio, Puerto Rico
  4. 3.0 79 km N of San Antonio, Puerto Rico
  5. 2.3 27 km NW of Rincón, Puerto Rico
  6. 2.8 54 km N of Isabela, Puerto Rico
  7. 2.7 69 km N of Isabela, Puerto Rico
  8. 2.6 Mona Passage
  9. 2.7 39 km NW of Aguadilla, Puerto Rico
  10. 2.4 26 km N of Hatillo, Puerto Rico
  11. 2.6 15 km N of San Antonio, Puerto Rico
  12. 2.4 64 km NW of Aguadilla, Puerto Rico
  13. 2.9 54 km NW of San Antonio, Puerto Rico
  14. 2.5 36 km NW of San Antonio, Puerto Rico
  15. 2.9 53 km NNW of San Antonio, 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.