QuakeIndex

Earthquake · reviewed by a seismologist

M 3.4md

Earthquake near Mayagüez, PR

No earthquake was likely felt in Mayagüez in the 24 hours to 4:09 am AST (08:09 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 3.4 earthquake was recorded 44 km (28 mi) west of Mayagüez, PR, at 4:54 am AST on 28 March 2022 (08:54 UTC), 25 km deep.

USGS: 34 km WSW of Stella, Puerto Rico

44 km (27 mi) W of Mayagüez, PR · 102 km (63 mi) WNW of Ponce, PR

4:54 am AST, Mar 28, 2022 · · 25 km deep · released about 2.2 tons of TNT

Every earthquake near Mayagüez Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Rincón Municipio 35 kmMayagüez Municipio 38 kmAguada Municipio 43 kmAñasco Municipio 46 kmCabo Rojo Municipio 47 kmHormigueros Municipio 48 kmAguadilla Municipio 53 kmMoca Municipio 54 kmSan Germán Municipio 56 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
4:54 am AST on 28 March 2022 ()
Where
44 km (28 mi) west of Mayagüez, PR · earthquakes near Mayagüez
Magnitude
M 3.4 (md)
Depth
25 km below the surface
Felt
no reports yet
Nearest
Rincón Municipio, 35 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1690 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 54 km (34 mi) from the epicentre. In Mayagüez, 44 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.

Likely felt in: Rincón 35 km, intensity II · Puerto Real 42 km, intensity II · Aguada 43 km, intensity II · Mayagüez 44 km, intensity II · Pole Ojea 48 km, intensity II · Aguadilla 49 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 2.2 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 78,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 3,500× the energy of this one
  3. Magna, Utah 2020 M 5.7 2,500× the energy of this one
  4. This earthquake M 3.4 about 2.2 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 4.6× 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 28 times the energy of this one.

Before 2016, the USGS record lists 5 earthquakes of M5 or more within 50 km:

  1. 6.4 32 km NW of Aguadilla, Puerto Rico · 48 km NNE of this epicentre
  2. 6.3 6 km WNW of Aguadilla, Puerto Rico · 44 km NE of this epicentre
  3. 6.3 58 km E of Punta Cana, Dominican Republic · 45 km NW of this epicentre
  4. 5.2 19 km SW of Stella, Puerto Rico · 20 km E of this epicentre
  5. 5.1 21 km SW of Stella, Puerto Rico · 20 km ESE 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 18.2190, -67.5583. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Rincón Municipio, PR 35 km (22 mi) ENE earthquakes near Rincón Municipio
Mayagüez Municipio, PR 38 km (23 mi) WSW earthquakes near Mayagüez Municipio
Aguada Municipio, PR 43 km (27 mi) ENE earthquakes near Aguada Municipio
Añasco Municipio, PR 46 km (28 mi) E earthquakes near Añasco Municipio
Cabo Rojo Municipio, PR 47 km (29 mi) ESE earthquakes near Cabo Rojo Municipio
Hormigueros Municipio, PR 48 km (30 mi) ESE earthquakes near Hormigueros Municipio

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

Aftershocks so far

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

  1. 2.2 2 km S of Cabo Rojo, Puerto Rico
  2. 4.0 56 km SE of Punta Cana, Dominican Republic
  3. 2.7 3 km ENE of Rincón, Puerto Rico
  4. 2.8 9 km WSW of Mayagüez, Puerto Rico
  5. 3.1 10 km WSW of Mayagüez, Puerto Rico
  6. 2.1 2 km SSW of Añasco, Puerto Rico
  7. 3.0 66 km SE of Punta Cana, Dominican Republic
  8. 2.6 2 km NW of Pole Ojea, Puerto Rico
  9. 1.9 12 km WSW of Pole Ojea, Puerto Rico
  10. 1.9 4 km NW of Cabo Rojo, Puerto Rico
  11. 2.8 3 km E 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.