QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

4 km WNW of San Sebastián, Puerto Rico

· 22 km deep · released about 24 lb of TNT

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10 km30 km60 km120 km N Moca Municipio 6 kmSan Sebastián Municipio 7 kmAñasco Municipio 13 kmIsabela Municipio 14 kmLas Marías Municipio 15 kmQuebradillas Municipio 16 kmAguada Municipio 17 kmAguadilla Municipio 18 kmLares 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
22 km below the surface
Felt
no reports yet
Nearest
Moca Municipio, 6 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2652 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 24 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 5.8 640,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 450,000× the energy of this one
  3. Around the size people start to feel M 3.0 40× the energy of this one
  4. This earthquake M 1.9 about 24 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 18.3545, -67.0300. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Moca Municipio, PR 6 km (4 mi) ESE of here earthquakes near Moca Municipio
San Sebastián Municipio, PR 7 km (4 mi) WNW of here earthquakes near San Sebastián Municipio
Añasco Municipio, PR 13 km (8 mi) NE of here earthquakes near Añasco Municipio
Isabela Municipio, PR 14 km (9 mi) S of here earthquakes near Isabela Municipio
Las Marías Municipio, PR 15 km (9 mi) NNW of here earthquakes near Las Marías Municipio
Quebradillas Municipio, PR 16 km (10 mi) SW of here earthquakes near Quebradillas Municipio

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

Aftershocks so far

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

  1. 2.0 6 km NNE of Sabana Eneas, Puerto Rico
  2. 2.3 3 km ENE of Espino, Puerto Rico
  3. 1.9 8 km N of Yauco, Puerto Rico
  4. 2.5 25 km NW of Rincón, Puerto Rico
  5. 2.5 5 km NNE of Isabela, Puerto Rico
  6. 2.1 2 km E of Mayagüez, Puerto Rico
  7. 1.7 5 km NNE of Sabana Grande, Puerto Rico
  8. 1.8 4 km SSW of Añasco, Puerto Rico
  9. 1.9 6 km NW of Adjuntas, Puerto Rico
  10. 1.6 5 km NNE of Sabana Grande, Puerto Rico
  11. 2.4 5 km NNE of Sabana Grande, Puerto Rico
  12. 1.6 7 km ESE of Las Marías, Puerto Rico
  13. 2.0 8 km W of Maricao, Puerto Rico
  14. 2.0 8 km WSW of Guánica, Puerto Rico
  15. 1.9 25 km NNE of Isabela, 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 2017-10-14 — it released about 3,600 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.