QuakeIndex

Earthquake · reviewed by a seismologist

M 3.7md

3 km S of La Parguera, Puerto Rico

· 12 km deep · released about 5.2 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lajas Municipio 4 kmGuánica Municipio 14 kmCabo Rojo Municipio 15 kmSan Germán Municipio 19 kmSabana Grande Municipio 19 kmHormigueros Municipio 23 kmYauco Municipio 26 kmGuayanilla Municipio 28 kmMaricao Municipio 29 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
12 km below the surface
Felt
16 reports · strongest reported intensity IV
Measured shaking
intensity III (ShakeMap)
USGS impact alert
green
Nearest
Lajas Municipio, 4 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2108 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 16 people have reported feeling it to USGS.

How big was it?

This earthquake released about 5.2 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 33,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 1,500× 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 5.2 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 17.9396, -67.0515. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lajas Municipio, PR 4 km (3 mi) SSW of here earthquakes near Lajas Municipio
Guánica Municipio, PR 14 km (8 mi) W of here earthquakes near Guánica Municipio
Cabo Rojo Municipio, PR 15 km (9 mi) ESE of here earthquakes near Cabo Rojo Municipio
San Germán Municipio, PR 19 km (12 mi) S of here earthquakes near San Germán Municipio
Sabana Grande Municipio, PR 19 km (12 mi) SW of here earthquakes near Sabana Grande Municipio
Hormigueros Municipio, PR 23 km (14 mi) SSE of here earthquakes near Hormigueros 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. 2.7 15 km SSE of Maria Antonia, Puerto Rico
  2. 3.0 7 km ESE of La Parguera, Puerto Rico
  3. 2.2 3 km NNE of La Parguera, Puerto Rico
  4. 2.4 8 km SE of La Parguera, Puerto Rico
  5. 3.8 7 km ESE of La Parguera, Puerto Rico
  6. 2.5 7 km S of Indios, Puerto Rico
  7. 2.7 4 km SW of Guánica, Puerto Rico
  8. 2.4 1 km NNW of Guayanilla, Puerto Rico
  9. 2.7 10 km SE of Pole Ojea, Puerto Rico
  10. 1.8 7 km ESE of La Parguera, Puerto Rico
  11. 2.5 13 km SSE of Maria Antonia, Puerto Rico
  12. 2.6 4 km SE of Maria Antonia, Puerto Rico
  13. 2.9 4 km SSW of Tallaboa, Puerto Rico
  14. 2.4 5 km WSW of Guánica, Puerto Rico
  15. 2.5 1 km WSW of La Parguera, 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 12,000 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.