QuakeIndex

Earthquake · reviewed by a seismologist

M 3.4md

Earthquake near Rincón, PR

No earthquake was likely felt in Rincón in the 24 hours to 4:07 pm AST (20:07 UTC). The last one was M 3.4, 53 km (33 mi) NNE, at 9:00 pm AST on 27 October 2026, estimated intensity II (weak) in town. Every earthquake near Rincón

This page: a magnitude 3.4 earthquake was recorded 20 km (12 mi) west-northwest of Rincón, PR, at 12:05 am AST on 21 July 2024 (04:05 UTC), 7.9 km deep.

USGS: 19 km WNW of Rincón, Puerto Rico

37 km (23 mi) NW of Mayagüez, PR · 144 km (89 mi) W of San Juan, PR

12:05 am AST, Jul 21, 2024 · · 7.9 km deep · released about 1.8 tons of TNT

Every earthquake near Rincón Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Rincón Municipio 20 kmAguada Municipio 26 kmAguadilla Municipio 31 kmAñasco Municipio 33 kmMoca Municipio 37 kmHormigueros Municipio 44 kmIsabela Municipio 45 kmSan Sebastián Municipio 49 kmLas Marías Municipio 51 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
12:05 am AST on 21 July 2024 ()
Where
20 km (12 mi) west-northwest of Rincón, PR · earthquakes near Rincón
Magnitude
M 3.4 (md)
Depth
7.9 km below the surface
Felt
no reports yet
Nearest
Rincón Municipio, 20 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 774 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, people at rest would likely notice it out to about 56 km (35 mi) from the epicentre. In Rincón, 20 km away, the estimate is intensity III (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.

Likely felt in: Rincón 20 km, intensity III · Aguada 25 km, intensity II · Aguadilla 29 km, intensity II · Mayagüez 37 km, intensity II · Rafael Hernandez 38 km, intensity II · Puerto Real 44 km, intensity II · Isabela 44 km, intensity II · San Sebastián 47 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 1.8 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.4 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 92,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 4,100× the energy of this one
  3. Magna, Utah 2020 M 5.7 2,900× the energy of this one
  4. This earthquake M 3.4 about 1.8 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 3.8× more

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 4.4 on 2017-10-01 — about 33 times the energy of this one.

Before 2016, the USGS record lists 11 earthquakes of M5 or more within 50 km; the five largest:

  1. 7.1 24 km NNW of San Antonio, Puerto Rico · 42 km NE of this epicentre
  2. 6.4 32 km NW of Aguadilla, Puerto Rico · 25 km N of this epicentre
  3. 6.3 6 km WNW of Aguadilla, Puerto Rico · 23 km ENE of this epicentre
  4. 6.3 58 km E of Punta Cana, Dominican Republic · 47 km WNW of this epicentre
  5. 6.1 15 km WNW of San Antonio, Puerto Rico · 27 km NE 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 18.3937, -67.4273. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Rincón Municipio, PR 20 km (12 mi) ESE earthquakes near Rincón Municipio
Aguada Municipio, PR 26 km (16 mi) E earthquakes near Aguada Municipio
Aguadilla Municipio, PR 31 km (20 mi) ENE earthquakes near Aguadilla Municipio
Añasco Municipio, PR 33 km (21 mi) ESE earthquakes near Añasco Municipio
Moca Municipio, PR 37 km (23 mi) E earthquakes near Moca Municipio
Hormigueros Municipio, PR 44 km (27 mi) SE earthquakes near Hormigueros Municipio

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

Aftershocks so far

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

  1. 3.2 46 km NW of San Antonio, Puerto Rico
  2. 2.6 9 km NNW of Puerto Real, Puerto Rico
  3. 3.3 58 km WSW of Stella, Puerto Rico
  4. 2.9 35 km NW of San Antonio, Puerto Rico
  5. 3.1 27 km NW of San Antonio, Puerto Rico
  6. 3.2 30 km W of Rincón, Puerto Rico
  7. 2.3 21 km WNW of Rincón, Puerto Rico
  8. 2.8 3 km NW of Mayagüez, Puerto Rico
  9. 2.1 2 km ESE of Puerto Real, Puerto Rico
  10. 2.3 7 km ESE of Mayagüez, Puerto Rico
  11. 2.8 3 km WNW of Mayagüez, Puerto Rico
  12. 3.2 37 km WNW of Rincón, Puerto Rico
  13. 2.9 19 km SW of Stella, Puerto Rico
  14. 3.1 46 km NW of San Antonio, Puerto Rico
  15. 3.2 44 km NW of San Antonio, 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.