QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7Md

1 km WSW of San Sebastián, Puerto Rico

· 19 km deep · released about 11 lb of TNT

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10 km30 km60 km120 km N San Sebastián Municipio 4 kmMoca Municipio 10 kmLas Marías Municipio 12 kmAñasco Municipio 14 kmLares Municipio 15 kmQuebradillas Municipio 17 kmIsabela Municipio 17 kmMaricao Municipio 19 kmCamuy 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 1.7 (Md)
Depth
19 km below the surface
Felt
no reports yet
Nearest
San Sebastián Municipio, 4 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3700 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 11 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,400,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,000,000× the energy of this one
  3. Around the size people start to feel M 3.0 89× the energy of this one
  4. This earthquake M 1.7 about 11 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 18.3316, -67.0029. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Sebastián Municipio, PR 4 km (2 mi) W of here earthquakes near San Sebastián Municipio
Moca Municipio, PR 10 km (6 mi) ESE of here earthquakes near Moca Municipio
Las Marías Municipio, PR 12 km (7 mi) NNW of here earthquakes near Las Marías Municipio
Añasco Municipio, PR 14 km (9 mi) ENE of here earthquakes near Añasco Municipio
Lares Municipio, PR 15 km (10 mi) WNW of here earthquakes near Lares Municipio
Quebradillas Municipio, PR 17 km (11 mi) SSW of here earthquakes near Quebradillas Municipio

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

Aftershocks so far

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

  1. 2.3 7 km SSE of Lares, Puerto Rico
  2. 1.9 3 km WSW of Palmarejo, Puerto Rico
  3. 1.7 14 km W of Puerto Real, Puerto Rico
  4. 2.8 9 km NW of Caban, Puerto Rico
  5. 3.3 9 km NW of Caban, Puerto Rico
  6. 2.4 29 km N of Isabela, Puerto Rico
  7. 2.4 8 km SSE of Pole Ojea, Puerto Rico
  8. 2.5 15 km NNW of Rincón, Puerto Rico
  9. 2.9 5 km SSE of Maria Antonia, Puerto Rico
  10. 2.3 2 km SSW of La Playa, Puerto Rico
  11. 2.4 12 km S of Lares, Puerto Rico
  12. 2.1 4 km SW of La Playa, Puerto Rico
  13. 2.8 13 km N of Camuy, Puerto Rico
  14. 1.6 6 km S of La Parguera, Puerto Rico
  15. 2.0 8 km ESE of Maricao, 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.