QuakeIndex

Earthquake · reviewed by a seismologist

M 3.6ml

3 km NNE of Sabana Grande, Puerto Rico

· 20 km deep · released about 3.8 tons of TNT

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10 km30 km60 km120 km N Sabana Grande Municipio 3 kmMaricao Municipio 7 kmSan Germán Municipio 9 kmYauco Municipio 10 kmLas Marías Municipio 13 kmLajas Municipio 18 kmHormigueros Municipio 18 kmGuánica Municipio 18 kmGuayanilla Municipio 20 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 3.6 (ml)
Depth
20 km below the surface
Felt
11 reports · strongest reported intensity III
Measured shaking
intensity III (ShakeMap)
Nearest
Sabana Grande Municipio, 3 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1133 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 11 people have reported feeling it to USGS.

How big was it?

This earthquake released about 3.8 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.6 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 45,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 2,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 1,400× the energy of this one
  4. This earthquake M 3.6 about 3.8 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 7.9× 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 18.1121, -66.9516. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Sabana Grande Municipio, PR 3 km (2 mi) N of here earthquakes near Sabana Grande Municipio
Maricao Municipio, PR 7 km (4 mi) SSW of here earthquakes near Maricao Municipio
San Germán Municipio, PR 9 km (6 mi) E of here earthquakes near San Germán Municipio
Yauco Municipio, PR 10 km (6 mi) WNW of here earthquakes near Yauco Municipio
Las Marías Municipio, PR 13 km (8 mi) SSE of here earthquakes near Las Marías Municipio
Lajas Municipio, PR 18 km (11 mi) NNE 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. 2.5 4 km SW of Guánica, Puerto Rico
  2. 2.6 Puerto Rico region
  3. 3.2 3 km S of La Parguera, Puerto Rico
  4. 2.2 13 km SW of Gu?nica, Puerto Rico
  5. 2.2 7 km ESE of La Parguera, Puerto Rico
  6. 2.6 3 km SE of Maria Antonia, Puerto Rico
  7. 2.4 2 km SW of Indios, Puerto Rico
  8. 2.2 Puerto Rico region
  9. 2.2 3 km SSW of Indios, Puerto Rico
  10. 3.2 1 km NE of Hatillo, Puerto Rico
  11. 2.2 7 km SE of La Parguera, Puerto Rico
  12. 2.5 1 km SSW of Palomas, Puerto Rico
  13. 2.6 2 km N of Palomas, Puerto Rico
  14. 2.2 4 km SSW of Indios, Puerto Rico
  15. 2.3 5 km SW 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 16,000 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.