QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

Earthquake near Hormigueros, PR

No earthquake was likely felt in Hormigueros in the 24 hours to 5:23 pm AST (21:23 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 1.8 earthquake was recorded 2 km (1 mi) west-northwest of Hormigueros, PR, at 8:35 pm AST on 22 June 2019 (00:35 UTC), 16 km deep.

USGS: 2 km WNW of Hormigueros, Puerto Rico

6 km (4 mi) S of Mayagüez, PR · 118 km (73 mi) WSW of San Juan, PR

8:35 pm AST, Jun 22, 2019 · · 16 km deep · released about 13 lb of TNT

Every earthquake near Hormigueros Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Hormigueros Municipio 4 kmSan Germán Municipio 12 kmAñasco Municipio 16 kmCabo Rojo Municipio 17 kmLas Marías Municipio 20 kmLajas Municipio 22 kmSabana Grande Municipio 22 kmMaricao Municipio 23 kmRincón Municipio 24 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
8:35 pm AST on 22 June 2019 ()
Where
2 km (1 mi) west-northwest of Hormigueros, PR · earthquakes near Hormigueros
Magnitude
M 1.8 (md)
Depth
16 km below the surface
Felt
no reports yet
Nearest
Hormigueros Municipio, 4 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2699 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. In Hormigueros, 2 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.

Earthquakes near other towns within 30 km: Mayagüez, Cabo Rojo, Monte Grande, Puerto Real, Sabana Eneas, San Germán.

How big was it?

This earthquake released about 13 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,200,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 840,000× the energy of this one
  3. Around the size people start to feel M 3.0 75× the energy of this one
  4. This earthquake M 1.8 about 13 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 6,700 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 · 46 km N of this epicentre
  3. 5.8 4 km E of Moca, Puerto Rico · 29 km NNE of this epicentre
  4. 5.2 19 km SW of Stella, Puerto Rico · 24 km WNW of this epicentre
  5. 5.1 21 km SW of Stella, Puerto Rico · 24 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 18.1458, -67.1476. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Hormigueros Municipio, PR 4 km (2 mi) ESE earthquakes near Hormigueros Municipio
San Germán Municipio, PR 12 km (8 mi) ESE earthquakes near San Germán Municipio
Añasco Municipio, PR 16 km (10 mi) N earthquakes near Añasco Municipio
Cabo Rojo Municipio, PR 17 km (11 mi) SSW earthquakes near Cabo Rojo Municipio
Las Marías Municipio, PR 20 km (13 mi) ENE earthquakes near Las Marías Municipio
Lajas Municipio, PR 22 km (14 mi) SSE earthquakes near Lajas Municipio

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

Aftershocks so far

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

  1. 1.8 1 km ESE of Stella, Puerto Rico
  2. 2.0 6 km NNE of Sabana Eneas, Puerto Rico
  3. 2.3 3 km ENE of Espino, Puerto Rico
  4. 1.9 8 km N of Yauco, Puerto Rico
  5. 1.5 22 km W of Pole Ojea, Puerto Rico
  6. 2.5 25 km NW of Rincón, Puerto Rico
  7. 2.5 5 km NNE of Isabela, Puerto Rico
  8. 2.1 2 km E of Mayagüez, Puerto Rico
  9. 1.7 5 km NNE of Sabana Grande, Puerto Rico
  10. 1.8 4 km SSW of Añasco, Puerto Rico
  11. 1.9 6 km NW of Adjuntas, Puerto Rico
  12. 1.6 5 km NNE of Sabana Grande, Puerto Rico
  13. 2.4 5 km NNE of Sabana Grande, Puerto Rico
  14. 1.6 7 km ESE of Las Marías, Puerto Rico
  15. 2.0 8 km W of Maricao, 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.