QuakeIndex

Earthquake · reviewed by a seismologist

M 3.7md

4 km SW of Indios, Puerto Rico

· 15 km deep · released about 5.4 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Guayanilla Municipio 7 kmGuánica Municipio 8 kmYauco Municipio 14 kmPeñuelas Municipio 15 kmSabana Grande Municipio 18 kmLajas Municipio 21 kmMaricao Municipio 26 kmPonce Municipio 26 kmSan Germán Municipio 26 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 3.7 (md)
Depth
15 km below the surface
Felt
12 reports · strongest reported intensity IV
Measured shaking
intensity III (ShakeMap)
USGS impact alert
green
Nearest
Guayanilla Municipio, 7 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 833 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 12 people have reported feeling it to USGS.

How big was it?

This earthquake released about 5.4 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.7 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 32,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 1,400× the energy of this one
  3. Magna, Utah 2020 M 5.7 1,000× the energy of this one
  4. This earthquake M 3.7 about 5.4 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 11× 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 17.9586, -66.8470. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Guayanilla Municipio, PR 7 km (5 mi) SW of here earthquakes near Guayanilla Municipio
Guánica Municipio, PR 8 km (5 mi) E of here earthquakes near Guánica Municipio
Yauco Municipio, PR 14 km (9 mi) S of here earthquakes near Yauco Municipio
Peñuelas Municipio, PR 15 km (9 mi) WSW of here earthquakes near Peñuelas Municipio
Sabana Grande Municipio, PR 18 km (11 mi) SE of here earthquakes near Sabana Grande Municipio
Lajas Municipio, PR 21 km (13 mi) E of here earthquakes near Lajas Municipio

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

Aftershocks so far

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

  1. 2.8 3 km S of La Parguera, Puerto Rico
  2. 2.4 6 km SE of Maria Antonia, Puerto Rico
  3. 2.7 2 km S of Liborio Negron Torres, Puerto Rico
  4. 2.5 3 km E of Yauco, Puerto Rico
  5. 1.8 6 km NNW of Yauco, Puerto Rico
  6. 2.7 7 km SSW of Guánica, Puerto Rico
  7. 2.0 5 km SW of Guánica, Puerto Rico
  8. 2.6 4 km SW of Guánica, Puerto Rico
  9. 2.3 5 km SE of Maria Antonia, Puerto Rico
  10. 2.5 10 km SW of Guánica, Puerto Rico
  11. 2.4 9 km NW of Puerto Real, Puerto Rico
  12. 2.3 1 km SW of Indios, Puerto Rico
  13. 2.5 6 km SSW of Lares, Puerto Rico
  14. 2.2 11 km SSE of Maria Antonia, Puerto Rico
  15. 2.4 2 km SW 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 11,000 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.