QuakeIndex

Earthquake · reviewed by a seismologist

M 3.4md

8 km E of Mayagüez, Puerto Rico

· 111 km deep · released about 2 tons of TNT

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10 km30 km60 km120 km N Las Marías Municipio 9 kmHormigueros Municipio 9 kmSan Germán Municipio 11 kmAñasco Municipio 12 kmMaricao Municipio 14 kmSan Sebastián Municipio 17 kmSabana Grande Municipio 18 kmMoca Municipio 20 kmLares Municipio 22 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
111 km below the surface
Felt
1 report · strongest reported intensity II
Measured shaking
intensity II (ShakeMap)
Nearest
Las Marías Municipio, 9 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1510 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 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 83,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 3,700× the energy of this one
  3. Magna, Utah 2020 M 5.7 2,600× the energy of this one
  4. This earthquake M 3.4 about 2 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 4.3× 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 18.2003, -67.0608. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Las Marías Municipio, PR 9 km (6 mi) WSW of here earthquakes near Las Marías Municipio
Hormigueros Municipio, PR 9 km (6 mi) NE of here earthquakes near Hormigueros Municipio
San Germán Municipio, PR 11 km (7 mi) NNW of here earthquakes near San Germán Municipio
Añasco Municipio, PR 12 km (8 mi) SE of here earthquakes near Añasco Municipio
Maricao Municipio, PR 14 km (8 mi) WNW of here earthquakes near Maricao Municipio
San Sebastián Municipio, PR 17 km (11 mi) SSW of here earthquakes near San Sebastián Municipio

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

Aftershocks so far

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

  1. 2.5 Puerto Rico region
  2. 3.2 5 km SSE of Guánica, Puerto Rico
  3. 2.4 4 km SW of La Parguera, Puerto Rico
  4. 2.8 6 km WSW of La Parguera, Puerto Rico
  5. 2.6 5 km WSW of La Parguera, Puerto Rico
  6. 2.3 6 km SE of Maria Antonia, Puerto Rico
  7. 3.0 6 km W of La Parguera, Puerto Rico
  8. 2.8 6 km WSW of La Parguera, Puerto Rico
  9. 3.1 6 km SW of La Parguera, Puerto Rico
  10. 2.8 6 km WSW of La Parguera, Puerto Rico
  11. 4.3 5 km WSW of La Parguera, Puerto Rico
  12. 3.4 7 km WSW of La Parguera, Puerto Rico
  13. 2.6 5 km SW of La Parguera, Puerto Rico
  14. 2.5 5 km SW of La Parguera, Puerto Rico
  15. 2.3 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 6.4 on 2020-01-07 — it released about 30,000 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.