QuakeIndex

Earthquake · reviewed by a seismologist

M 2.9ml

8 km WNW of Adjuntas, Puerto Rico

· 10 km deep · released about 680 lb of TNT

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10 km30 km60 km120 km N Adjuntas Municipio 4 kmUtuado Municipio 12 kmLares Municipio 12 kmYauco Municipio 15 kmMaricao Municipio 16 kmLas Marías Municipio 20 kmPeñuelas Municipio 20 kmJayuya Municipio 21 kmSabana Grande Municipio 21 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 2.9 (ml)
Depth
10 km below the surface
Felt
no reports yet
Nearest
Adjuntas Municipio, 4 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2381 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 680 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 22,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 16,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.4× the energy of this one
  4. This earthquake M 2.9 about 680 lb of TNT

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 18.2017, -66.7874. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Adjuntas Municipio, PR 4 km (2 mi) NW of here earthquakes near Adjuntas Municipio
Utuado Municipio, PR 12 km (7 mi) SW of here earthquakes near Utuado Municipio
Lares Municipio, PR 12 km (7 mi) SE of here earthquakes near Lares Municipio
Yauco Municipio, PR 15 km (9 mi) NNE of here earthquakes near Yauco Municipio
Maricao Municipio, PR 16 km (10 mi) E of here earthquakes near Maricao Municipio
Las Marías Municipio, PR 20 km (13 mi) E of here earthquakes near Las Marías Municipio

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

Aftershocks so far

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

  1. 1.7 2 km S of Santo Domingo, Puerto Rico
  2. 2.3 7 km SSE of Indios, Puerto Rico
  3. 2.0 3 km S of Magas Arriba, Puerto Rico
  4. 2.7 7 km SSE of Indios, Puerto Rico
  5. 3.9 7 km SSE of Maria Antonia, Puerto Rico
  6. 3.7 10 km SSW of Tallaboa, Puerto Rico
  7. 1.9 7 km SSE of Tallaboa, Puerto Rico
  8. 2.2 1 km SSW of Santo Domingo, Puerto Rico
  9. 4.1 7 km S of Tallaboa, Puerto Rico
  10. 2.6 6 km SSW of Tallaboa, Puerto Rico
  11. 2.3 2 km SE of Magas Arriba, Puerto Rico
  12. 3.4 Puerto Rico region
  13. 2.9 13 km SSE of Maria Antonia, Puerto Rico
  14. 3.3 4 km SSW of Tallaboa, Puerto Rico
  15. 1.9 3 km SSE of Indios, 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 6.4 on 2020-01-07 — it released about 180,000 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.