QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6md

Earthquake near Mayagüez, PR

No earthquake was likely felt in Mayagüez in the 24 hours to 11:14 pm AST (03:14 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 1.6 earthquake was recorded 41 km (25 mi) south of Mayagüez, PR, at 10:52 am AST on 2 August 2018 (14:52 UTC), 4.0 km deep.

USGS: Puerto Rico region

41 km (25 mi) S of Mayagüez, PR · 125 km (78 mi) WSW of San Juan, PR

10:52 am AST, Aug 2, 2018 · · 4.0 km deep · released about 6.4 lb of TNT

Every earthquake near Mayagüez Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lajas Municipio 16 kmCabo Rojo Municipio 20 kmGuánica Municipio 21 kmSan Germán Municipio 30 kmSabana Grande Municipio 31 kmHormigueros Municipio 33 kmGuayanilla Municipio 35 kmYauco Municipio 36 kmMaricao Municipio 40 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
10:52 am AST on 2 August 2018 ()
Where
41 km (25 mi) south of Mayagüez, PR · earthquakes near Mayagüez
Magnitude
M 1.6 (md)
Depth
4.0 km below the surface
Felt
no reports yet
Nearest
Lajas Municipio, 16 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3023 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

At this magnitude and depth, people at rest would likely notice it out to about 10 km (6 mi) from the epicentre. In Mayagüez, 41 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: La Parguera, Pole Ojea, Palmarejo, Boquerón, Lajas, Guánica.

How big was it?

This earthquake released about 6.4 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,400,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,700,000× the energy of this one
  3. Around the size people start to feel M 3.0 150× the energy of this one
  4. This earthquake M 1.6 about 6.4 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.

Where

Epicentre 17.8393, -67.0843. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Lajas Municipio, PR 16 km (10 mi) NNE earthquakes near Lajas Municipio
Cabo Rojo Municipio, PR 20 km (13 mi) NNW earthquakes near Cabo Rojo Municipio
Guánica Municipio, PR 21 km (13 mi) NE earthquakes near Guánica Municipio
San Germán Municipio, PR 30 km (19 mi) N earthquakes near San Germán Municipio
Sabana Grande Municipio, PR 31 km (19 mi) NNE earthquakes near Sabana Grande Municipio
Hormigueros Municipio, PR 33 km (21 mi) N earthquakes near Hormigueros Municipio

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

Aftershocks so far

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

  1. 2.1 3 km WSW of Maricao, Puerto Rico
  2. 2.1 5 km WNW of Maricao, Puerto Rico
  3. 1.9 5 km ESE of La Parguera, Puerto Rico
  4. 2.4 20 km WNW of Puerto Real, Puerto Rico
  5. 1.6 2 km SE of Guánica, Puerto Rico
  6. 1.6 5 km SW of Guánica, Puerto Rico
  7. 1.8 6 km SW of Liborio Negron Torres, Puerto Rico
  8. 1.8 8 km SSE of Guánica, Puerto Rico
  9. 1.6 8 km S of La Parguera, Puerto Rico
  10. 1.7 3 km W of Sabana Grande, Puerto Rico
  11. 2.5 14 km SSW of Guánica, Puerto Rico
  12. 2.4 14 km SSW of Guánica, Puerto Rico
  13. 2.5 5 km N of Puerto Real, Puerto Rico
  14. 1.8 2 km SE of Puerto Real, Puerto Rico
  15. 1.9 0 km SSW of Boquerón, 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.