QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

6 km NNE of Sabana Grande, Puerto Rico

· 13 km deep · released about 15 lb of TNT

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10 km30 km60 km120 km N Maricao Municipio 5 kmSabana Grande Municipio 5 kmYauco Municipio 9 kmSan Germán Municipio 11 kmLas Marías Municipio 12 kmLares Municipio 18 kmAdjuntas Municipio 19 kmHormigueros Municipio 19 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
13 km below the surface
Felt
no reports yet
Nearest
Maricao Municipio, 5 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2651 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 5.7 710,000× the energy of this one
  3. Around the size people start to feel M 3.0 63× 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 18.1283, -66.9326. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Maricao Municipio, PR 5 km (3 mi) S of here earthquakes near Maricao Municipio
Sabana Grande Municipio, PR 5 km (3 mi) NNE of here earthquakes near Sabana Grande Municipio
Yauco Municipio, PR 9 km (6 mi) WNW of here earthquakes near Yauco Municipio
San Germán Municipio, PR 11 km (7 mi) ENE of here earthquakes near San Germán Municipio
Las Marías Municipio, PR 12 km (7 mi) SSE of here earthquakes near Las Marías Municipio
Lares Municipio, PR 18 km (11 mi) SSW of here earthquakes near Lares Municipio

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

Aftershocks so far

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

  1. 1.8 1 km ESE of Stella, Puerto Rico
  2. 2.0 6 km NNE of Sabana Eneas, Puerto Rico
  3. 2.3 3 km ENE of Espino, Puerto Rico
  4. 1.9 8 km N of Yauco, Puerto Rico
  5. 2.5 5 km NNE of Isabela, Puerto Rico
  6. 1.7 4 km WSW of Ponce, Puerto Rico
  7. 2.1 2 km E of Mayagüez, Puerto Rico
  8. 1.7 5 km NNE of Sabana Grande, Puerto Rico
  9. 1.8 4 km SSW of Añasco, Puerto Rico
  10. 1.9 6 km NW of Adjuntas, Puerto Rico
  11. 1.6 5 km NNE of Sabana Grande, Puerto Rico
  12. 2.4 5 km NNE of Sabana Grande, Puerto Rico
  13. 1.6 7 km ESE of Las Marías, Puerto Rico
  14. 2.0 8 km W of Maricao, Puerto Rico
  15. 2.0 8 km WSW 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.