QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

1 km SSE of Guaynabo, Puerto Rico

· 117 km deep · released about 1,300 lb of TNT

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10 km30 km60 km120 km N Guaynabo Municipio 1 kmBayamón Municipio 7 kmSan Juan Municipio 9 kmAguas Buenas Municipio 10 kmTrujillo Alto Municipio 11 kmCataño Municipio 12 kmToa Alta Municipio 15 kmGurabo Municipio 15 kmCarolina Municipio 16 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 3.1 (md)
Depth
117 km below the surface
Felt
no reports yet
Nearest
Guaynabo Municipio, 1 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 259 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 1,300 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 270,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 12,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 8,500× the energy of this one
  4. This earthquake M 3.1 about 1,300 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.3× 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 18.3450, -66.1052. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Guaynabo Municipio, PR 1 km (1 mi) E of here earthquakes near Guaynabo Municipio
Bayamón Municipio, PR 7 km (4 mi) E of here earthquakes near Bayamón Municipio
San Juan Municipio, PR 9 km (6 mi) SSW of here earthquakes near San Juan Municipio
Aguas Buenas Municipio, PR 10 km (6 mi) NNE of here earthquakes near Aguas Buenas Municipio
Trujillo Alto Municipio, PR 11 km (7 mi) W of here earthquakes near Trujillo Alto Municipio
Cataño Municipio, PR 12 km (7 mi) SSE of here earthquakes near Cataño Municipio

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

Aftershocks so far

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

  1. 3.2 10 km NNE of Brenas, Puerto Rico
  2. 3.4 8 km NNE of Brenas, Puerto Rico
  3. 1.8 6 km SSE of Arroyo, Puerto Rico
  4. 1.9 1 km SSW of Candelaria Arenas, Puerto Rico
  5. 3.1 3 km ESE of San Juan, Puerto Rico
  6. 2.5 5 km N of Coamo, Puerto Rico
  7. 4.2 2 km SW of Río Lajas, Puerto Rico
  8. 2.7 3 km SE of Jobos, Puerto Rico
  9. 1.5 1 km NE of Vázquez, Puerto Rico
  10. 2.1 1 km SE of Aguas Buenas, Puerto Rico
  11. 1.6 2 km ESE of Jobos, Puerto Rico
  12. 2.1 2 km SE of Jobos, Puerto Rico
  13. 2.5 1 km W of Santa Clara, Puerto Rico
  14. 2.5 4 km ESE of Pájaros, Puerto Rico
  15. 2.8 17 km N of San Juan, 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 4.6 on 2019-03-12 — it released about 190 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.