QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8Md

3 km SSE of Las Marías, Puerto Rico

· 26 km deep · released about 15 lb of TNT

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10 km30 km60 km120 km N Las Marías Municipio 1 kmMaricao Municipio 7 kmSan Sebastián Municipio 13 kmLares Municipio 14 kmSan Germán Municipio 14 kmSabana Grande Municipio 15 kmHormigueros Municipio 17 kmAñasco Municipio 17 kmYauco 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
26 km below the surface
Felt
no reports yet
Nearest
Las Marías Municipio, 1 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3706 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 18.2191, -66.9830. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Las Marías Municipio, PR 1 km (1 mi) SSW of here earthquakes near Las Marías Municipio
Maricao Municipio, PR 7 km (4 mi) NW of here earthquakes near Maricao Municipio
San Sebastián Municipio, PR 13 km (8 mi) S of here earthquakes near San Sebastián Municipio
Lares Municipio, PR 14 km (8 mi) WSW of here earthquakes near Lares Municipio
San Germán Municipio, PR 14 km (8 mi) NNE of here earthquakes near San Germán Municipio
Sabana Grande Municipio, PR 15 km (10 mi) NNW of here earthquakes near Sabana Grande Municipio

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

Aftershocks so far

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

  1. 1.8 21 km SSE of La Parguera, Puerto Rico
  2. 2.0 8 km ESE of Maricao, Puerto Rico
  3. 2.5 2 km ESE of La Playa, Puerto Rico
  4. 2.9 9 km NE of Arecibo, Puerto Rico
  5. 2.6 21 km SW of Stella, Puerto Rico
  6. 2.5 4 km WNW of Aguada, Puerto Rico
  7. 2.8 8 km N of Quebradillas, Puerto Rico
  8. 2.7 4 km NNW of La Playa, Puerto Rico
  9. 2.0 10 km W of Puerto Real, Puerto Rico
  10. 1.8 17 km W of Rincón, Puerto Rico
  11. 2.7 3 km SW of Aguada, Puerto Rico
  12. 2.6 10 km WSW of Mayagüez, Puerto Rico
  13. 2.1 9 km SSW of Tallaboa, Puerto Rico
  14. 1.7 5 km N of Santo Domingo, Puerto Rico
  15. 1.5 3 km ENE of Pole Ojea, 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.