QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7md

61 km N of Hatillo, Puerto Rico

Yes. A magnitude 2.7 earthquake was recorded 61 km N of Hatillo, Puerto Rico, at 10:44 pm AST on 4 August 2019 (02:44 UTC), 23 km deep.

· 23 km deep · released about 360 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Isabela Municipio 63 kmQuebradillas Municipio 64 kmCamuy Municipio 66 kmHatillo Municipio 67 kmAguadilla Municipio 68 kmArecibo Municipio 70 kmBarceloneta Municipio 71 kmMoca Municipio 77 kmManatí Municipio 77 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
Magnitude
M 2.7 (md)
Depth
23 km below the surface
Felt
no reports yet
Nearest
Isabela Municipio, 63 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2655 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 11 km (7 mi) from the epicentre. 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 360 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 42,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 30,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.6× the energy of this one
  4. This earthquake M 2.7 about 360 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 4.7 on 2017-07-17 — about 810 times the energy of this one.

Before 2016, the USGS record lists 16 earthquakes of M5 or more within 50 km; the five largest:

  1. 7.7 45 km N of San Antonio, Puerto Rico · 30 km WSW of this epicentre
  2. 6.4 61 km N of Hatillo, Puerto Rico · 6 km E of this epicentre
  3. 6.0 81 km N of Isabela, Puerto Rico · 22 km NNW of this epicentre
  4. 6.0 67 km NNW of San Antonio, Puerto Rico · 41 km W of this epicentre
  5. 5.9 78 km N of Arecibo, Puerto Rico · 28 km ENE 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 19.0373, -66.8688. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Isabela Municipio, PR 63 km (39 mi) SSW earthquakes near Isabela Municipio
Quebradillas Municipio, PR 64 km (40 mi) S earthquakes near Quebradillas Municipio
Camuy Municipio, PR 66 km (41 mi) S earthquakes near Camuy Municipio
Hatillo Municipio, PR 67 km (41 mi) S earthquakes near Hatillo Municipio
Aguadilla Municipio, PR 68 km (42 mi) SSW earthquakes near Aguadilla Municipio
Arecibo Municipio, PR 70 km (44 mi) SSE earthquakes near Arecibo Municipio

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

Aftershocks so far

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

  1. 2.6 17 km N of Hatillo, Puerto Rico
  2. 1.9 57 km N of Isabela, Puerto Rico
  3. 2.9 69 km N of Arecibo, Puerto Rico
  4. 2.9 63 km N of Tierras Nuevas Poniente, Puerto Rico
  5. 2.4 37 km NNW of San Antonio, Puerto Rico
  6. 2.6 68 km N of Arecibo, Puerto Rico
  7. 2.8 69 km N of Arecibo, Puerto Rico
  8. 2.1 45 km N of Hatillo, Puerto Rico
  9. 2.2 33 km NNE of Isabela, Puerto Rico
  10. 2.0 25 km NNE of Isabela, Puerto Rico
  11. 2.8 66 km NNW of San Antonio, Puerto Rico
  12. 2.2 41 km N of Hatillo, Puerto Rico
  13. 2.6 79 km N of Tierras Nuevas Poniente, Puerto Rico
  14. 2.5 66 km N of Arecibo, Puerto Rico
  15. 2.2 32 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.