QuakeIndex

Earthquake · reviewed by a seismologist

M 3.3md

4 km ENE of Guaynabo, Puerto Rico

· 109 km deep · released about 1.3 tons of TNT

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10 km30 km60 km120 km N Guaynabo Municipio 5 kmSan Juan Municipio 6 kmTrujillo Alto Municipio 8 kmBayamón Municipio 11 kmCarolina Municipio 11 kmCataño Municipio 12 kmAguas Buenas Municipio 14 kmGurabo Municipio 14 kmLoíza 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
109 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Guaynabo Municipio, 5 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1029 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 18.3672, -66.0703. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Guaynabo Municipio, PR 5 km (3 mi) ENE of here earthquakes near Guaynabo Municipio
San Juan Municipio, PR 6 km (4 mi) S of here earthquakes near San Juan Municipio
Trujillo Alto Municipio, PR 8 km (5 mi) WNW of here earthquakes near Trujillo Alto Municipio
Bayamón Municipio, PR 11 km (7 mi) E of here earthquakes near Bayamón Municipio
Carolina Municipio, PR 11 km (7 mi) WSW of here earthquakes near Carolina Municipio
Cataño Municipio, PR 12 km (7 mi) SE of here earthquakes near Cataño Municipio

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

Aftershocks so far

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

  1. 1.8 6 km SSW of Orocovis, Puerto Rico
  2. 2.3 8 km SSW of Orocovis, Puerto Rico
  3. 3.3 Puerto Rico region
  4. 2.1 7 km NNW of Coamo, Puerto Rico
  5. 3.0 24 km NNW of Loíza, Puerto Rico
  6. 2.5 2 km SSE of Caguas, Puerto Rico
  7. 2.0 Puerto Rico region
  8. 2.1 Puerto Rico region
  9. 3.4 8 km S of Orocovis, Puerto Rico
  10. 2.8 1 km SSW of Cidra, Puerto Rico
  11. 2.3 Puerto Rico region
  12. 3.2 2 km NNW 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 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.