QuakeIndex

Earthquake · reviewed by a seismologist

M 3.5md

5 km WNW of Mayagüez, Puerto Rico

· 25 km deep · released about 2.3 tons of TNT

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10 km30 km60 km120 km N Añasco Municipio 9 kmHormigueros Municipio 12 kmRincón Municipio 15 kmAguada Municipio 17 kmSan Germán Municipio 20 kmMoca Municipio 20 kmLas Marías Municipio 22 kmCabo Rojo Municipio 25 kmSan Sebastián Municipio 26 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 3.5 (md)
Depth
25 km below the surface
Felt
no reports yet
Nearest
Añasco Municipio, 9 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 74 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 2.3 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.5 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 75,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 3,300× the energy of this one
  3. Magna, Utah 2020 M 5.7 2,400× the energy of this one
  4. This earthquake M 3.5 about 2.3 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 4.7× 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 18.2231, -67.1823. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Añasco Municipio, PR 9 km (6 mi) SW of here earthquakes near Añasco Municipio
Hormigueros Municipio, PR 12 km (7 mi) NW of here earthquakes near Hormigueros Municipio
Rincón Municipio, PR 15 km (9 mi) SSE of here earthquakes near Rincón Municipio
Aguada Municipio, PR 17 km (11 mi) S of here earthquakes near Aguada Municipio
San Germán Municipio, PR 20 km (12 mi) NW of here earthquakes near San Germán Municipio
Moca Municipio, PR 20 km (13 mi) SSW of here earthquakes near Moca Municipio

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

Aftershocks so far

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

  1. 2.3 1 km SE of Indios, Puerto Rico
  2. 3.4 38 km W of Rincón, Puerto Rico
  3. 3.2 3 km S of Cabo Rojo, Puerto Rico
  4. 2.4 2 km W of Indios, Puerto Rico
  5. 2.2 3 km N of Las Marias, Puerto Rico
  6. 2.2 5 km SE of Maria Antonia, Puerto Rico
  7. 2.1 3 km SSW of Guánica, Puerto Rico
  8. 2.6 1 km ESE of Indios, Puerto Rico
  9. 3.2 1 km ENE of Indios, Puerto Rico
  10. 2.9 1 km ENE of Sabana Grande, Puerto Rico
  11. 2.3 8 km SSE of Maria Antonia, Puerto Rico
  12. 2.3 7 km ESE of La Parguera, Puerto Rico
  13. 2.5 7 km WSW of Fuig, Puerto Rico
  14. 1.9 Puerto Rico region
  15. 2.1 0 km SSE of Guánica, 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 27,000 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.