QuakeIndex

Earthquake · reviewed by a seismologist

M 2.4md

Earthquake near Guayama, PR

No earthquake was likely felt in Guayama in the 24 hours to 12:53 pm AST (16:53 UTC). The last one was M 3.3, 35 km (22 mi) WSW, at 8:40 am AST on 1 November 2026, estimated intensity II (weak) in town. Every earthquake near Guayama

This page: a magnitude 2.4 earthquake was recorded 37 km (23 mi) south-southeast of Guayama, PR, at 7:32 am AST on 3 April 2019 (11:32 UTC), 34 km deep.

USGS: 33 km SSE of Arroyo, Puerto Rico

82 km (51 mi) S of San Juan, PR

7:32 am AST, Apr 3, 2019 · · 34 km deep · released about 140 lb of TNT

Every earthquake near Guayama Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Arroyo Municipio 34 kmPatillas Municipio 36 kmMaunabo Municipio 37 kmGuayama Municipio 38 kmSalinas Municipio 45 kmYabucoa Municipio 45 kmCayey Municipio 51 kmSan Lorenzo Municipio 53 kmSanta Isabel Municipio 53 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
7:32 am AST on 3 April 2019 ()
Where
37 km (23 mi) south-southeast of Guayama, PR · earthquakes near Guayama
Magnitude
M 2.4 (md)
Depth
34 km below the surface
Felt
no reports yet
Nearest
Arroyo Municipio, 34 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2779 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 Guayama, 37 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.

How big was it?

This earthquake released about 140 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.4 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 110,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 78,000× the energy of this one
  3. Around the size people start to feel M 3.0 6.9× the energy of this one
  4. This earthquake M 2.4 about 140 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 4.6 on 2016-12-05 — about 1,700 times the energy of this one.

Before 2016, the USGS record lists one earthquake of M5 or more within 50 km:

  1. 5.3 68 km SSE of Emajagua, Puerto Rico · 41 km SE 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 17.6726, -65.9783. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Arroyo Municipio, PR 34 km (21 mi) NNW earthquakes near Arroyo Municipio
Patillas Municipio, PR 36 km (23 mi) N earthquakes near Patillas Municipio
Maunabo Municipio, PR 37 km (23 mi) NNE earthquakes near Maunabo Municipio
Guayama Municipio, PR 38 km (23 mi) NNW earthquakes near Guayama Municipio
Salinas Municipio, PR 45 km (28 mi) NW earthquakes near Salinas Municipio
Yabucoa Municipio, PR 45 km (28 mi) NNE earthquakes near Yabucoa Municipio

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

Aftershocks so far

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

  1. 1.5 5 km SSW of Emajagua, Puerto Rico
  2. 2.4 11 km S of Salinas, Puerto Rico
  3. 2.0 3 km SSE of Salinas, Puerto Rico
  4. 1.5 1 km NNE of Jobos, Puerto Rico
  5. 1.7 24 km SE of Emajagua, Puerto Rico
  6. 2.1 7 km S of Salinas, Puerto Rico
  7. 2.5 22 km SE of Emajagua, Puerto Rico
  8. 2.0 24 km SSE of Emajagua, Puerto Rico
  9. 1.7 11 km SW of Central Aguirre, Puerto Rico
  10. 2.4 12 km S of Salinas, Puerto Rico
  11. 1.8 27 km SE of Emajagua, Puerto Rico
  12. 1.9 5 km SE of La Plena, Puerto Rico
  13. 1.9 11 km SSW of Emajagua, Puerto Rico
  14. 2.0 12 km S of Emajagua, Puerto Rico
  15. 1.6 12 km S of Emajagua, 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.