QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

4 km N of Sabana Grande, Puerto Rico

· 20 km deep · released about 15 lb of TNT

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10 km30 km60 km120 km N Sabana Grande Municipio 4 kmMaricao Municipio 7 kmSan Germán Municipio 8 kmYauco Municipio 12 kmLas Marías Municipio 13 kmHormigueros Municipio 16 kmLajas Municipio 17 kmGuánica Municipio 19 kmLares 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 1.8 (md)
Depth
20 km below the surface
Felt
no reports yet
Nearest
Sabana Grande Municipio, 4 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2574 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 15 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 730,000× the energy of this one
  3. Around the size people start to feel M 3.0 65× the energy of this one
  4. This earthquake M 1.8 about 15 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 18.1141, -66.9646. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Sabana Grande Municipio, PR 4 km (2 mi) NNW of here earthquakes near Sabana Grande Municipio
Maricao Municipio, PR 7 km (5 mi) SSW of here earthquakes near Maricao Municipio
San Germán Municipio, PR 8 km (5 mi) E of here earthquakes near San Germán Municipio
Yauco Municipio, PR 12 km (7 mi) WNW of here earthquakes near Yauco Municipio
Las Marías Municipio, PR 13 km (8 mi) S of here earthquakes near Las Marías Municipio
Hormigueros Municipio, PR 16 km (10 mi) E of here earthquakes near Hormigueros Municipio

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

Aftershocks so far

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

  1. 1.6 4 km ESE of Boquerón, Puerto Rico
  2. 2.0 1 km SE of Maricao, Puerto Rico
  3. 1.7 13 km SW of Potala Pastillo, Puerto Rico
  4. 1.5 10 km SSE of Ponce, Puerto Rico
  5. 1.9 12 km SSE of Ponce, Puerto Rico
  6. 2.2 3 km ESE of Maricao, Puerto Rico
  7. 2.1 20 km SW of Stella, Puerto Rico
  8. 1.9 2 km SSE of Mayagüez, Puerto Rico
  9. 2.1 7 km SE of Espino, Puerto Rico
  10. 1.6 6 km WSW of Liborio Negron Torres, Puerto Rico
  11. 1.9 4 km WNW of La Parguera, Puerto Rico
  12. 1.6 0 km NE of Guayanilla, Puerto Rico
  13. 1.7 0 km WSW of Magas Arriba, Puerto Rico
  14. 1.8 11 km SSE of La Parguera, Puerto Rico
  15. 1.6 2 km NW of Maricao, 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 4.3 on 2019-09-05 — it released about 5,800 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.