QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

2 km N of Sabana Grande, Puerto Rico

· 7.0 km deep · released about 16 lb of TNT

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10 km30 km60 km120 km N Sabana Grande Municipio 2 kmSan Germán Municipio 8 kmMaricao Municipio 9 kmYauco Municipio 11 kmLas Marías Municipio 14 kmLajas Municipio 16 kmHormigueros Municipio 17 kmGuánica Municipio 17 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 1.8 (md)
Depth
7.0 km below the surface
Felt
no reports yet
Nearest
Sabana Grande Municipio, 2 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2653 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 16 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 5.8 930,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 660,000× the energy of this one
  3. Around the size people start to feel M 3.0 59× the energy of this one
  4. This earthquake M 1.8 about 16 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 18.0996, -66.9588. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Sabana Grande Municipio, PR 2 km (1 mi) NW of here earthquakes near Sabana Grande Municipio
San Germán Municipio, PR 8 km (5 mi) E of here earthquakes near San Germán Municipio
Maricao Municipio, PR 9 km (5 mi) SSW of here earthquakes near Maricao Municipio
Yauco Municipio, PR 11 km (7 mi) W of here earthquakes near Yauco Municipio
Las Marías Municipio, PR 14 km (9 mi) S of here earthquakes near Las Marías Municipio
Lajas Municipio, PR 16 km (10 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

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

  1. 1.7 4 km WSW of Ponce, Puerto Rico
  2. 2.1 2 km E of Mayagüez, Puerto Rico
  3. 1.7 5 km NNE of Sabana Grande, Puerto Rico
  4. 1.8 4 km SSW of Añasco, Puerto Rico
  5. 1.9 6 km NW of Adjuntas, Puerto Rico
  6. 1.6 5 km NNE of Sabana Grande, Puerto Rico
  7. 2.4 5 km NNE of Sabana Grande, Puerto Rico
  8. 1.6 7 km ESE of Las Marías, Puerto Rico
  9. 2.0 8 km W of Maricao, Puerto Rico
  10. 2.0 8 km WSW of Guánica, Puerto Rico
  11. 1.6 6 km NNE of Ponce, Puerto Rico
  12. 1.5 6 km NE of Sabana Grande, Puerto Rico
  13. 1.9 6 km NNE of Sabana Grande, Puerto Rico
  14. 1.5 5 km SE of Boquerón, Puerto Rico
  15. 1.6 11 km SSW 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.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.