QuakeIndex

Earthquake · reviewed by a seismologist

M 3.3md

1 km ESE of Guaynabo, Puerto Rico

· 57 km deep · released about 1.3 tons of TNT

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10 km30 km60 km120 km N Guaynabo Municipio 2 kmBayamón Municipio 8 kmSan Juan Municipio 8 kmTrujillo Alto Municipio 10 kmAguas Buenas Municipio 11 kmCataño Municipio 12 kmCarolina Municipio 14 kmGurabo Municipio 15 kmToa Baja 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 3.3 (md)
Depth
57 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Guaynabo Municipio, 2 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1604 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 1.3 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 6.7 130,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 6,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 4,300× the energy of this one
  4. This earthquake M 3.3 about 1.3 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 2.6× 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 18.3508, -66.0946. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Guaynabo Municipio, PR 2 km (1 mi) ENE of here earthquakes near Guaynabo Municipio
Bayamón Municipio, PR 8 km (5 mi) E of here earthquakes near Bayamón Municipio
San Juan Municipio, PR 8 km (5 mi) SSW of here earthquakes near San Juan Municipio
Trujillo Alto Municipio, PR 10 km (6 mi) W of here earthquakes near Trujillo Alto Municipio
Aguas Buenas Municipio, PR 11 km (7 mi) NNE of here earthquakes near Aguas Buenas 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

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

  1. 3.1 5 km SSE of Pájaros, Puerto Rico
  2. 2.8 7 km NNW of San Juan, Puerto Rico
  3. 2.2 0 km N of Salinas, Puerto Rico
  4. 2.8 3 km ESE of Jobos, Puerto Rico
  5. 2.6 3 km NNW of Coamo, Puerto Rico
  6. 2.9 1 km WNW of Río Lajas, Puerto Rico
  7. 3.0 5 km N of Levittown, Puerto Rico
  8. 2.0 Puerto Rico region
  9. 2.7 5 km NW of Orocovis, Puerto Rico
  10. 3.1 1 km NNW of Campanilla, Puerto Rico
  11. 3.1 2 km NW of Cataño, Puerto Rico
  12. 2.6 5 km ESE of Naranjito, Puerto Rico
  13. 3.0 4 km S of G. L. Garcia, Puerto Rico
  14. 2.4 4 km NNE of Aibonito, Puerto Rico
  15. 3.6 0 km E of Sabana Seca, 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 95 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.