QuakeIndex

Earthquake · reviewed by a seismologist

M 3.0md

1 km SSE of Monte Grande, Puerto Rico

· 18 km deep · released about 1,100 lb of TNT

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10 km30 km60 km120 km N Hormigueros Municipio 7 kmSan Germán Municipio 8 kmCabo Rojo Municipio 12 kmLajas Municipio 12 kmSabana Grande Municipio 16 kmMaricao Municipio 21 kmLas Marías Municipio 21 kmGuánica Municipio 23 kmAñasco Municipio 24 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 3.0 (md)
Depth
18 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Hormigueros Municipio, 7 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1366 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 1,100 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 320,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 14,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 10,000× the energy of this one
  4. This earthquake M 3.0 about 1,100 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 18.0732, -67.0983. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Hormigueros Municipio, PR 7 km (4 mi) SSE of here earthquakes near Hormigueros Municipio
San Germán Municipio, PR 8 km (5 mi) WSW of here earthquakes near San Germán Municipio
Cabo Rojo Municipio, PR 12 km (8 mi) NE of here earthquakes near Cabo Rojo Municipio
Lajas Municipio, PR 12 km (8 mi) NNW of here earthquakes near Lajas Municipio
Sabana Grande Municipio, PR 16 km (10 mi) W of here earthquakes near Sabana Grande Municipio
Maricao Municipio, PR 21 km (13 mi) WSW of here earthquakes near Maricao Municipio

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

Aftershocks so far

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

  1. 2.3 Puerto Rico region
  2. 2.2 0 km WNW of Guayanilla, Puerto Rico
  3. 2.4 7 km SW of Tallaboa, Puerto Rico
  4. 1.9 2 km SE of Cabo Rojo, Puerto Rico
  5. 2.2 15 km S of Guánica, Puerto Rico
  6. 1.9 Puerto Rico region
  7. 2.6 4 km SW of Indios, Puerto Rico
  8. 2.2 10 km SSE of Maria Antonia, Puerto Rico
  9. 3.2 0 km WNW of Mayag?ez, Puerto Rico
  10. 2.4 Puerto Rico region
  11. 2.3 3 km S of Indios, Puerto Rico
  12. 2.1 4 km WSW of Guánica, Puerto Rico
  13. 2.5 0 km S of Fuig, Puerto Rico
  14. 1.7 Puerto Rico region
  15. 2.9 Puerto Rico region

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 110,000 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.