QuakeIndex

Earthquake · reviewed by a seismologist

M 2.9md

1 km ENE of Mayag?ez, Puerto Rico

· 24 km deep · released about 720 lb of TNT

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10 km30 km60 km120 km N Hormigueros Municipio 8 kmAñasco Municipio 9 kmSan Germán Municipio 15 kmLas Marías Municipio 16 kmRincón Municipio 20 kmMoca Municipio 20 kmAguada Municipio 20 kmMaricao Municipio 21 kmSan Sebastián Municipio 22 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 (md)
Depth
24 km below the surface
Felt
no reports yet
Nearest
Hormigueros Municipio, 8 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 983 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 720 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 21,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 15,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.3× the energy of this one
  4. This earthquake M 2.9 about 720 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 18.2077, -67.1275. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Hormigueros Municipio, PR 8 km (5 mi) N of here earthquakes near Hormigueros Municipio
Añasco Municipio, PR 9 km (5 mi) S of here earthquakes near Añasco Municipio
San Germán Municipio, PR 15 km (9 mi) NW of here earthquakes near San Germán Municipio
Las Marías Municipio, PR 16 km (10 mi) W of here earthquakes near Las Marías Municipio
Rincón Municipio, PR 20 km (12 mi) SE of here earthquakes near Rincón Municipio
Moca Municipio, PR 20 km (12 mi) SSW of here earthquakes near Moca Municipio

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

Aftershocks so far

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

  1. 2.3 10 km SSE of Maria Antonia, Puerto Rico
  2. 2.3 1 km N of Fuig, Puerto Rico
  3. 2.4 7 km SW of La Parguera, Puerto Rico
  4. 2.1 1 km SW of Guánica, Puerto Rico
  5. 2.0 Puerto Rico region
  6. 1.6 Puerto Rico region
  7. 3.6 Puerto Rico region
  8. 2.3 0 km NW of Indios, Puerto Rico
  9. 2.2 2 km SSW of Guánica, Puerto Rico
  10. 2.2 4 km SSW of Guánica, Puerto Rico
  11. 3.0 2 km ENE of Mayagüez, Puerto Rico
  12. 2.2 3 km SW of La Parguera, Puerto Rico
  13. 2.0 2 km N of Indios, Puerto Rico
  14. 1.9 5 km SSW of Guánica, Puerto Rico
  15. 3.8 5 km S of Guánica, 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 170,000 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.