QuakeIndex

Earthquake · reviewed by a seismologist

M 3.0md

4 km NNE of San Germán, Puerto Rico

· 14 km deep · released about 1,000 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Germán Municipio 2 kmHormigueros Municipio 9 kmSabana Grande Municipio 10 kmMaricao Municipio 12 kmLas Marías Municipio 13 kmLajas Municipio 16 kmYauco Municipio 19 kmAñasco Municipio 21 kmCabo Rojo 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 3.0 (md)
Depth
14 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
San Germán Municipio, 2 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1339 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 1,000 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 6.7 330,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 15,000× 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 1,000 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 18.1242, -67.0317. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Germán Municipio, PR 2 km (1 mi) NNE of here earthquakes near San Germán Municipio
Hormigueros Municipio, PR 9 km (6 mi) E of here earthquakes near Hormigueros Municipio
Sabana Grande Municipio, PR 10 km (6 mi) WNW of here earthquakes near Sabana Grande Municipio
Maricao Municipio, PR 12 km (7 mi) WSW of here earthquakes near Maricao Municipio
Las Marías Municipio, PR 13 km (8 mi) SSW of here earthquakes near Las Marías Municipio
Lajas Municipio, PR 16 km (10 mi) N of here earthquakes near Lajas Municipio

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

Aftershocks so far

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

  1. 2.0 Puerto Rico region
  2. 2.5 4 km SSE of Guánica, Puerto Rico
  3. 2.1 2 km ESE of Palomas, Puerto Rico
  4. 2.4 2 km S of Maria Antonia, Puerto Rico
  5. 2.1 2 km W of Fuig, Puerto Rico
  6. 2.7 3 km WSW of Guánica, Puerto Rico
  7. 2.7 Mona Passage
  8. 2.2 5 km SSW of Indios, Puerto Rico
  9. 2.4 4 km SSW of Indios, Puerto Rico
  10. 2.6 Puerto Rico region
  11. 2.5 7 km SE of Maria Antonia, Puerto Rico
  12. 1.9 Mona Passage
  13. 1.9 6 km WSW of Fuig, Puerto Rico
  14. 2.5 0 km SSW of Yauco, Puerto Rico
  15. 2.3 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 120,000 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.