QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

Earthquake near Hormigueros, PR

No earthquake was likely felt in Hormigueros in the 24 hours to 11:31 am AST (15:31 UTC). The last one was M 2.1, 15 km (9 mi) S, at 11:57 pm AST on 8 November 2026, estimated intensity II (weak) in town. Every earthquake near Hormigueros

This page: a magnitude 1.9 earthquake was recorded in Hormigueros, PR, at 6:38 am AST on 5 April 2019 (10:38 UTC), 18 km deep.

USGS: 1 km ENE of Hormigueros, Puerto Rico

7 km (4 mi) SSE of Mayagüez, PR · 115 km (71 mi) WSW of San Juan, PR

6:38 am AST, Apr 5, 2019 · · 18 km deep · released about 21 lb of TNT

Every earthquake near Hormigueros Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Hormigueros Municipio 1 kmSan Germán Municipio 9 kmAñasco Municipio 16 kmLas Marías Municipio 17 kmCabo Rojo Municipio 18 kmSabana Grande Municipio 19 kmMaricao Municipio 19 kmLajas Municipio 20 kmSan Sebastián Municipio 26 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
6:38 am AST on 5 April 2019 ()
Where
in Hormigueros, PR · earthquakes near Hormigueros
Magnitude
M 1.9 (md)
Depth
18 km below the surface
Felt
no reports yet
Nearest
Hormigueros Municipio, 1 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2777 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. 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: Mayagüez, Monte Grande, Cabo Rojo, Sabana Eneas, San Germán, Puerto Real.

How big was it?

This earthquake released about 21 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 730,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 520,000× the energy of this one
  3. Around the size people start to feel M 3.0 46× the energy of this one
  4. This earthquake M 1.9 about 21 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 4,100 times the energy of this one.

Before 2016, the USGS record lists 5 earthquakes of M5 or more within 50 km:

  1. 6.3 6 km WNW of Aguadilla, Puerto Rico · 34 km NNW of this epicentre
  2. 6.1 15 km WNW of San Antonio, Puerto Rico · 47 km NNW of this epicentre
  3. 5.8 4 km E of Moca, Puerto Rico · 29 km N of this epicentre
  4. 5.2 19 km SW of Stella, Puerto Rico · 27 km W of this epicentre
  5. 5.1 21 km SW of Stella, Puerto Rico · 27 km W 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 18.1468, -67.1148. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Hormigueros Municipio, PR 1 km (1 mi) S earthquakes near Hormigueros Municipio
San Germán Municipio, PR 9 km (6 mi) ESE earthquakes near San Germán Municipio
Añasco Municipio, PR 16 km (10 mi) N earthquakes near Añasco Municipio
Las Marías Municipio, PR 17 km (11 mi) ENE earthquakes near Las Marías Municipio
Cabo Rojo Municipio, PR 18 km (11 mi) SSW earthquakes near Cabo Rojo Municipio
Sabana Grande Municipio, PR 19 km (12 mi) ESE earthquakes near Sabana Grande Municipio

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

Aftershocks so far

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

  1. 1.9 11 km W of Puerto Real, Puerto Rico
  2. 1.9 11 km E of Maricao, Puerto Rico
  3. 1.6 3 km SSE of Adjuntas, Puerto Rico
  4. 2.4 27 km SW of Stella, Puerto Rico
  5. 1.6 3 km WNW of Santo Domingo, Puerto Rico
  6. 1.9 10 km WSW of Puerto Real, Puerto Rico
  7. 1.8 5 km SSE of Adjuntas, Puerto Rico
  8. 1.8 5 km S of Adjuntas, Puerto Rico
  9. 1.7 9 km NNW of Puerto Real, Puerto Rico
  10. 2.5 8 km NW of Puerto Real, Puerto Rico
  11. 2.1 8 km NW of Puerto Real, Puerto Rico
  12. 2.6 8 km NW of Puerto Real, Puerto Rico
  13. 2.0 Mona Passage
  14. 1.9 6 km ESE of Maricao, Puerto Rico
  15. 2.1 5 km NW of Rincón, 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.