QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8md

Earthquake near Mayagüez, PR

No earthquake was likely felt in Mayagüez in the 24 hours to 1:48 am AST (05:48 UTC). The last one was M 2.9, 25 km (15 mi) SSE, at 3:17 am AST on 8 November 2026, estimated intensity II (weak) in town. Every earthquake near Mayagüez

This page: a magnitude 2.8 earthquake was recorded 3 km (2 mi) west-northwest of Mayagüez, PR, at 6:55 pm AST on 4 August 2024 (22:55 UTC), 82 km deep.

USGS: 3 km WNW of Mayagüez, Puerto Rico

in Mayagüez, PR · 119 km (74 mi) W of San Juan, PR

6:55 pm AST, Aug 4, 2024 · · 82 km deep · released about 510 lb of TNT

Every earthquake near Mayagüez Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Añasco Municipio 9 kmHormigueros Municipio 10 kmRincón Municipio 16 kmAguada Municipio 18 kmSan Germán Municipio 18 kmLas Marías Municipio 20 kmMoca Municipio 21 kmCabo Rojo Municipio 24 kmSan Sebastián Municipio 25 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
6:55 pm AST on 4 August 2024 ()
Where
3 km (2 mi) west-northwest of Mayagüez, PR · earthquakes near Mayagüez
Magnitude
M 2.8 (md)
Depth
82 km below the surface
Felt
no reports yet
Nearest
Añasco Municipio, 9 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 829 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 Mayagüez, 3 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: Añasco, La Playa, Espino, Las Marias, Hormigueros, Cabo Rojo.

How big was it?

This earthquake released about 510 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 30,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 21,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.9× the energy of this one
  4. This earthquake M 2.8 about 510 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 6.4 on 2020-01-07 — about 230,000 times the energy of this one.

Before 2016, the USGS record lists 6 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.3 6 km WNW of Aguadilla, Puerto Rico · 26 km N of this epicentre
  2. 6.1 15 km WNW of San Antonio, Puerto Rico · 38 km N of this epicentre
  3. 6.1 18 km NNW of San Antonio, Puerto Rico · 47 km N of this epicentre
  4. 5.8 4 km E of Moca, Puerto Rico · 23 km NNE of this epicentre
  5. 5.2 19 km SW of Stella, Puerto Rico · 21 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 18.2137, -67.1692. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Añasco Municipio, PR 9 km (6 mi) NNE earthquakes near Añasco Municipio
Hormigueros Municipio, PR 10 km (6 mi) SSE earthquakes near Hormigueros Municipio
Rincón Municipio, PR 16 km (10 mi) NNW earthquakes near Rincón Municipio
Aguada Municipio, PR 18 km (11 mi) N earthquakes near Aguada Municipio
San Germán Municipio, PR 18 km (11 mi) SE earthquakes near San Germán Municipio
Las Marías Municipio, PR 20 km (13 mi) E earthquakes near Las Marías Municipio

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

Aftershocks so far

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

  1. 2.2 1 km NNW of Indios, Puerto Rico
  2. 3.4 4 km E of La Parguera, Puerto Rico
  3. 2.3 1 km SW of Magas Arriba, Puerto Rico
  4. 2.6 4 km E of La Parguera, Puerto Rico
  5. 2.3 6 km SE of La Parguera, Puerto Rico
  6. 2.2 4 km ESE of La Parguera, Puerto Rico
  7. 3.5 5 km ESE of La Parguera, Puerto Rico
  8. 2.5 4 km SSW of Indios, Puerto Rico
  9. 2.8 3 km WSW of Indios, Puerto Rico
  10. 2.0 7 km SSE of Guánica, Puerto Rico
  11. 2.5 1 km SSW of Palomas, Puerto Rico
  12. 2.2 3 km S of Liborio Negron Torres, Puerto Rico
  13. 2.5 5 km ENE of La Parguera, Puerto Rico
  14. 2.9 6 km SE of La Parguera, Puerto Rico
  15. 3.2 30 km W 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.