QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

3 km SW of San Sebastián, Puerto Rico

· 16 km deep · released about 25 lb of TNT

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10 km30 km60 km120 km N San Sebastián Municipio 5 kmMoca Municipio 9 kmLas Marías Municipio 11 kmAñasco Municipio 13 kmLares Municipio 16 kmMaricao Municipio 18 kmIsabela Municipio 18 kmAguada Municipio 19 kmQuebradillas Municipio 19 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 1.9 (md)
Depth
16 km below the surface
Felt
no reports yet
Nearest
San Sebastián Municipio, 5 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2555 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 25 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 620,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 440,000× the energy of this one
  3. Around the size people start to feel M 3.0 39× the energy of this one
  4. This earthquake M 1.9 about 25 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 18.3186, -67.0176. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Sebastián Municipio, PR 5 km (3 mi) WSW of here earthquakes near San Sebastián Municipio
Moca Municipio, PR 9 km (6 mi) SE of here earthquakes near Moca Municipio
Las Marías Municipio, PR 11 km (7 mi) NNW of here earthquakes near Las Marías Municipio
Añasco Municipio, PR 13 km (8 mi) ENE of here earthquakes near Añasco Municipio
Lares Municipio, PR 16 km (10 mi) WNW of here earthquakes near Lares Municipio
Maricao Municipio, PR 18 km (11 mi) NNW of here earthquakes near Maricao Municipio

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

Aftershocks so far

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

  1. 2.4 7 km ESE of Maricao, Puerto Rico
  2. 1.8 12 km N of Yauco, Puerto Rico
  3. 1.6 11 km SE of La Parguera, Puerto Rico
  4. 1.8 7 km WNW of Puerto Real, Puerto Rico
  5. 2.3 7 km WSW of Guánica, Puerto Rico
  6. 1.6 3 km WSW of Fuig, Puerto Rico
  7. 1.9 2 km SW of Adjuntas, Puerto Rico
  8. 2.0 2 km NNE of Sabana Grande, Puerto Rico
  9. 1.8 4 km WNW of Hormigueros, Puerto Rico
  10. 2.6 4 km NNE of Isabela, Puerto Rico
  11. 1.6 6 km WSW of Guánica, Puerto Rico
  12. 1.5 3 km WNW of Palmarejo, Puerto Rico
  13. 2.3 8 km NW of Caban, Puerto Rico
  14. 2.0 3 km SW of San Sebastián, Puerto Rico
  15. 2.4 25 km NW of Aguadilla, 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 3,500 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.