QuakeIndex

Earthquake · reviewed by a seismologist

M 3.9Md

6 km WNW of Aguas Buenas, Puerto Rico

· 131 km deep · released about 11 tons of TNT

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10 km30 km60 km120 km N Aguas Buenas Municipio 4 kmComerío Municipio 8 kmBayamón Municipio 8 kmGuaynabo Municipio 9 kmNaranjito Municipio 9 kmCidra Municipio 11 kmToa Alta Municipio 13 kmCaguas Municipio 14 kmCorozal Municipio 17 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 3.9 (Md)
Depth
131 km below the surface
Felt
15 reports · strongest reported intensity III
Tsunami
USGS flagged this event for tsunami evaluation. Follow tsunami.gov for official messages.
Nearest
Aguas Buenas Municipio, 4 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3542 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 15 people have reported feeling it to USGS.

How big was it?

This earthquake released about 11 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.9 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 16,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 710× the energy of this one
  3. Magna, Utah 2020 M 5.7 500× the energy of this one
  4. This earthquake M 3.9 about 11 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 22× 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 18.2752, -66.1652. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Aguas Buenas Municipio, PR 4 km (3 mi) WNW of here earthquakes near Aguas Buenas Municipio
Comerío Municipio, PR 8 km (5 mi) NE of here earthquakes near Comerío Municipio
Bayamón Municipio, PR 8 km (5 mi) S of here earthquakes near Bayamón Municipio
Guaynabo Municipio, PR 9 km (6 mi) SW of here earthquakes near Guaynabo Municipio
Naranjito Municipio, PR 9 km (6 mi) E of here earthquakes near Naranjito Municipio
Cidra Municipio, PR 11 km (7 mi) N of here earthquakes near Cidra Municipio

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

Aftershocks so far

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

  1. 2.1 1 km WSW of Río Blanco, Puerto Rico
  2. 1.9 1 km NE of Río Blanco, Puerto Rico
  3. 2.3 1 km N of Antón Ruiz, Puerto Rico
  4. 1.9 5 km N of Suárez, Puerto Rico
  5. 1.8 2 km ENE of Vieques, Puerto Rico
  6. 1.8 2 km N of Vieques, Puerto Rico
  7. 1.7 1 km E of Bajandas, Puerto Rico
  8. 2.2 2 km E of Potala Pastillo, Puerto Rico
  9. 2.2 1 km SW of Salinas, Puerto Rico
  10. 2.4 4 km ESE of Villalba, Puerto Rico
  11. 2.7 1 km WNW of Potala Pastillo, Puerto Rico
  12. 2.4 3 km NNW of Jagual, Puerto Rico
  13. 2.5 7 km NNW of Trujillo Alto, Puerto Rico
  14. 3.0 5 km SE of Pájaros, Puerto Rico
  15. 2.6 4 km S of G. L. Garcia, 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.

On USGS

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