QuakeIndex

Earthquake · reviewed by a seismologist

M 3.4md

1 km SSW of Pájaros, Puerto Rico

· 58 km deep · released about 1.8 tons of TNT

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10 km30 km60 km120 km N Toa Alta Municipio 3 kmBayamón Municipio 5 kmNaranjito Municipio 8 kmGuaynabo Municipio 11 kmToa Baja Municipio 12 kmCataño Municipio 12 kmCorozal Municipio 13 kmDorado Municipio 14 kmComerío Municipio 14 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
58 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Toa Alta Municipio, 3 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1503 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 1.8 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 95,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 4,300× the energy of this one
  3. Magna, Utah 2020 M 5.7 3,000× the energy of this one
  4. This earthquake M 3.4 about 1.8 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 3.7× 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 18.3550, -66.2202. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Toa Alta Municipio, PR 3 km (2 mi) ESE of here earthquakes near Toa Alta Municipio
Bayamón Municipio, PR 5 km (3 mi) W of here earthquakes near Bayamón Municipio
Naranjito Municipio, PR 8 km (5 mi) NNE of here earthquakes near Naranjito Municipio
Guaynabo Municipio, PR 11 km (7 mi) W of here earthquakes near Guaynabo Municipio
Toa Baja Municipio, PR 12 km (7 mi) SSW of here earthquakes near Toa Baja Municipio
Cataño Municipio, PR 12 km (8 mi) SW of here earthquakes near Cataño Municipio

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

Aftershocks so far

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

  1. 2.8 5 km NNW of Dorado, Puerto Rico
  2. 2.2 3 km N of Orocovis, Puerto Rico
  3. 2.3 3 km ESE of Salinas, Puerto Rico
  4. 3.6 1 km NNW of San José, Puerto Rico
  5. 3.0 3 km ESE of Cayey, Puerto Rico
  6. 3.0 3 km E of Cayey, Puerto Rico
  7. 1.8 2 km SW of G. L. Garcia, Puerto Rico
  8. 2.1 3 km ENE of Mariano Colón, Puerto Rico
  9. 2.5 6 km NNW of Los Llanos, Puerto Rico
  10. 2.7 4 km SE of Morovis, Puerto Rico
  11. 2.1 10 km SSW of Jayuya, Puerto Rico
  12. 3.1 1 km E of Salinas, Puerto Rico
  13. 3.8 5 km ENE of San Juan, Puerto Rico
  14. 2.2 Puerto Rico region
  15. 2.6 2 km ENE of Bayamon, 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 68 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.