QuakeIndex

Earthquake · reviewed by a seismologist

M 3.3md

20 km WSW of Stella, Puerto Rico

· 5.1 km deep · released about 1.1 tons of TNT

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10 km30 km60 km120 km N Rincón Municipio 21 kmAguada Municipio 29 kmAñasco Municipio 30 kmHormigueros Municipio 33 kmCabo Rojo Municipio 35 kmMoca Municipio 39 kmAguadilla Municipio 40 kmSan Germán Municipio 41 kmLas Marías Municipio 46 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 3.3 (md)
Depth
5.1 km below the surface
Felt
no reports yet
Nearest
Rincón Municipio, 21 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1464 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 1.1 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.3 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 150,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 6,700× the energy of this one
  3. Magna, Utah 2020 M 5.7 4,700× the energy of this one
  4. This earthquake M 3.3 about 1.1 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 2.4× 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 18.2273, -67.4085. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Rincón Municipio, PR 21 km (13 mi) SW of here earthquakes near Rincón Municipio
Aguada Municipio, PR 29 km (18 mi) SW of here earthquakes near Aguada Municipio
Añasco Municipio, PR 30 km (19 mi) WSW of here earthquakes near Añasco Municipio
Hormigueros Municipio, PR 33 km (20 mi) WNW of here earthquakes near Hormigueros Municipio
Cabo Rojo Municipio, PR 35 km (22 mi) NW of here earthquakes near Cabo Rojo Municipio
Moca Municipio, PR 39 km (24 mi) WSW of here earthquakes near Moca Municipio

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

Aftershocks so far

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

  1. 3.2 2 km W of La Parguera, Puerto Rico
  2. 2.3 1 km WSW of La Parguera, Puerto Rico
  3. 2.3 5 km WSW of La Parguera, Puerto Rico
  4. 2.2 3 km WSW of La Parguera, Puerto Rico
  5. 1.7 5 km SSW of Palmarejo, Puerto Rico
  6. 1.9 2 km SSE of La Parguera, Puerto Rico
  7. 2.0 5 km SW of Palmarejo, Puerto Rico
  8. 2.4 3 km WSW of La Parguera, Puerto Rico
  9. 1.9 Mona Passage
  10. 2.6 7 km WSW of La Parguera, 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 4.5 on 2021-07-18 — it released about 65 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.