QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

3 km N of Las Marías, Puerto Rico

· 29 km deep · released about 15 lb of TNT

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10 km30 km60 km120 km N San Sebastián Municipio 6 kmLas Marías Municipio 7 kmLares Municipio 13 kmMoca Municipio 14 kmMaricao Municipio 14 kmAñasco Municipio 15 kmSan Germán Municipio 20 kmQuebradillas Municipio 21 kmHormigueros 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
29 km below the surface
Felt
no reports yet
Nearest
San Sebastián Municipio, 6 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2475 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 18.2865, -66.9926. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Sebastián Municipio, PR 6 km (3 mi) SSW of here earthquakes near San Sebastián Municipio
Las Marías Municipio, PR 7 km (4 mi) NNW of here earthquakes near Las Marías Municipio
Lares Municipio, PR 13 km (8 mi) W of here earthquakes near Lares Municipio
Moca Municipio, PR 14 km (8 mi) SE of here earthquakes near Moca Municipio
Maricao Municipio, PR 14 km (9 mi) NNW of here earthquakes near Maricao Municipio
Añasco Municipio, PR 15 km (9 mi) E of here earthquakes near Añasco Municipio

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

Aftershocks so far

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

  1. 2.9 8 km SSE of Maria Antonia, Puerto Rico
  2. 2.0 6 km N of Ponce, Puerto Rico
  3. 2.4 1 km ESE of Espino, Puerto Rico
  4. 2.4 2 km N of Cabo Rojo, Puerto Rico
  5. 2.8 9 km N of Quebradillas, Puerto Rico
  6. 2.0 11 km SSW of Guánica, Puerto Rico
  7. 2.2 14 km NNW of San Antonio, Puerto Rico
  8. 1.9 2 km NNE of Las Marias, Puerto Rico
  9. 2.3 10 km SSE of La Parguera, Puerto Rico
  10. 2.5 9 km SE of Maria Antonia, Puerto Rico
  11. 2.2 1 km SE of Piedra Gorda, Puerto Rico
  12. 2.6 10 km ESE of Maricao, Puerto Rico
  13. 2.3 8 km SSW of Guánica, Puerto Rico
  14. 2.3 5 km SSW of La Playa, Puerto Rico
  15. 2.0 11 km W of Puerto Real, 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.