QuakeIndex

Earthquake · reviewed by a seismologist

M 3.4md

86 km SW of Pole Ojea, Puerto Rico

· 28 km deep · released about 2.1 tons of TNT

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10 km30 km60 km120 km N Mayagüez Municipio 75 kmCabo Rojo Municipio 89 kmLajas Municipio 99 kmHormigueros Municipio 105 kmGuánica Municipio 107 kmSan Germán Municipio 109 kmSabana Grande Municipio 114 kmRincón Municipio 116 kmAñasco Municipio 117 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
Magnitude
M 3.4 (md)
Depth
28 km below the surface
Felt
no reports yet
Nearest
Mayagüez Municipio, 75 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 47 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

How big was it?

This earthquake released about 2.1 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 80,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 3,600× 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 2.1 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 4.4× 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.

Where

Epicentre 17.4195, -67.7637. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mayagüez Municipio, PR 75 km (47 mi) S of here earthquakes near Mayagüez Municipio
Cabo Rojo Municipio, PR 89 km (55 mi) SW of here earthquakes near Cabo Rojo Municipio
Lajas Municipio, PR 99 km (61 mi) SW of here earthquakes near Lajas Municipio
Hormigueros Municipio, PR 105 km (65 mi) SW of here earthquakes near Hormigueros Municipio
Guánica Municipio, PR 107 km (66 mi) WSW of here earthquakes near Guánica Municipio
San Germán Municipio, PR 109 km (67 mi) SW of here earthquakes near San Germán Municipio

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

Aftershocks so far

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

  1. 3.3 64 km SW of Pole Ojea, Puerto Rico
  2. 3.7 110 km SW of Pole Ojea, Puerto Rico
  3. 3.4 105 km SW of Pole Ojea, Puerto Rico
  4. 3.2 94 km SSW of Pole Ojea, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.7 on 2026-02-10 — it released about 72 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.