QuakeIndex

Earthquake · reviewed by a seismologist

M 2.5md

Earthquake near Hormigueros, PR

No earthquake was likely felt in Hormigueros in the 24 hours to 1:02 pm AST (17:02 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 2.5 earthquake was recorded 8 km (5 mi) east-northeast of Hormigueros, PR, at 9:59 pm AST on 6 August 2019 (01:59 UTC), 95 km deep.

USGS: 7 km ENE of Hormigueros, Puerto Rico

10 km (6 mi) ESE of Mayagüez, PR · 109 km (67 mi) WSW of San Juan, PR

9:59 pm AST, Aug 6, 2019 · · 95 km deep · released about 190 lb of TNT

Every earthquake near Hormigueros Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Germán Municipio 7 kmHormigueros Municipio 7 kmLas Marías Municipio 11 kmMaricao Municipio 13 kmSabana Grande Municipio 15 kmAñasco Municipio 16 kmLajas Municipio 21 kmSan Sebastián Municipio 21 kmCabo Rojo Municipio 22 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
9:59 pm AST on 6 August 2019 ()
Where
8 km (5 mi) east-northeast of Hormigueros, PR · earthquakes near Hormigueros
Magnitude
M 2.5 (md)
Depth
95 km below the surface
Felt
no reports yet
Nearest
San Germán Municipio, 7 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2653 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 it was probably too small to be felt, even directly above it. In Hormigueros, 8 km away, the estimate is intensity I (not felt). 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: Maricao, Sabana Eneas, San Germán, Mayagüez, Monte Grande, Cabo Rojo.

How big was it?

This earthquake released about 190 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 78,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 55,000× the energy of this one
  3. Around the size people start to feel M 3.0 4.9× the energy of this one
  4. This earthquake M 2.5 about 190 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 440 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 · 35 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 · 26 km N of this epicentre
  4. 5.2 19 km SW of Stella, Puerto Rico · 33 km W of this epicentre
  5. 5.1 21 km SW of Stella, Puerto Rico · 33 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 18.1635, -67.0603. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
San Germán Municipio, PR 7 km (4 mi) SSE earthquakes near San Germán Municipio
Hormigueros Municipio, PR 7 km (4 mi) WSW earthquakes near Hormigueros Municipio
Las Marías Municipio, PR 11 km (7 mi) NE earthquakes near Las Marías Municipio
Maricao Municipio, PR 13 km (8 mi) E earthquakes near Maricao Municipio
Sabana Grande Municipio, PR 15 km (9 mi) SE earthquakes near Sabana Grande Municipio
Añasco Municipio, PR 16 km (10 mi) NNW earthquakes near Añasco Municipio

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

Aftershocks so far

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

  1. 1.5 Mona Passage
  2. 2.2 8 km SW of La Playa, Puerto Rico
  3. 2.1 8 km ESE of Maricao, Puerto Rico
  4. 2.4 6 km W of Hormigueros, Puerto Rico
  5. 1.9 3 km S of Mayagüez, Puerto Rico
  6. 2.1 12 km NNW of Rincón, Puerto Rico
  7. 1.9 3 km SW of Las Marías, Puerto Rico
  8. 1.7 10 km N of Yauco, Puerto Rico
  9. 1.8 1 km ENE of Mayagüez, Puerto Rico
  10. 1.9 10 km NNE of Isabela, Puerto Rico
  11. 2.1 2 km SW of Maricao, Puerto Rico
  12. 1.6 12 km WNW of Puerto Real, Puerto Rico
  13. 2.2 1 km NNW of Pole Ojea, Puerto Rico
  14. 1.6 8 km W of Mayagüez, Puerto Rico
  15. 2.0 2 km S of Mayagüez, 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.