QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

4 km E of Las Marías, Puerto Rico

· 17 km deep · released about 13 lb of TNT

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10 km30 km60 km120 km N Las Marías Municipio 4 kmMaricao Municipio 8 kmLares Municipio 9 kmSan Sebastián Municipio 10 kmSabana Grande Municipio 18 kmSan Germán Municipio 18 kmYauco Municipio 20 kmAñasco Municipio 20 kmMoca 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
17 km below the surface
Felt
no reports yet
Nearest
Las Marías Municipio, 4 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3132 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 13 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 1,200,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 840,000× the energy of this one
  3. Around the size people start to feel M 3.0 75× the energy of this one
  4. This earthquake M 1.8 about 13 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 18.2446, -66.9456. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Las Marías Municipio, PR 4 km (2 mi) ENE of here earthquakes near Las Marías Municipio
Maricao Municipio, PR 8 km (5 mi) N of here earthquakes near Maricao Municipio
Lares Municipio, PR 9 km (5 mi) WSW of here earthquakes near Lares Municipio
San Sebastián Municipio, PR 10 km (6 mi) SSE of here earthquakes near San Sebastián Municipio
Sabana Grande Municipio, PR 18 km (11 mi) N of here earthquakes near Sabana Grande Municipio
San Germán Municipio, PR 18 km (11 mi) NNE of here earthquakes near San Germán Municipio

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

Aftershocks so far

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

  1. 1.9 0 km W of Sabana Grande, Puerto Rico
  2. 2.6 19 km WSW of Stella, Puerto Rico
  3. 2.5 17 km N of Carrizales, Puerto Rico
  4. 2.1 4 km ESE of Boquerón, Puerto Rico
  5. 1.9 4 km SSE of Tallaboa, Puerto Rico
  6. 2.0 6 km NW of Puerto Real, Puerto Rico
  7. 2.5 3 km NNW of Lluveras, Puerto Rico
  8. 1.8 3 km WSW of Sabana Grande, Puerto Rico
  9. 2.1 24 km WNW of Puerto Real, Puerto Rico
  10. 2.0 7 km SSW of Indios, Puerto Rico
  11. 2.5 8 km S of Pole Ojea, Puerto Rico
  12. 2.0 1 km N of La Playa, Puerto Rico
  13. 2.4 8 km ESE of Jayuya, Puerto Rico
  14. 1.7 6 km E of Hormigueros, Puerto Rico
  15. 1.9 5 km W of Hormigueros, 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.