QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

4 km SSW of Añasco, Puerto Rico

· 67 km deep · released about 15 lb of TNT

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10 km30 km60 km120 km N Añasco Municipio 5 kmHormigueros Municipio 14 kmRincón Municipio 14 kmAguada Municipio 14 kmMoca Municipio 17 kmLas Marías Municipio 20 kmSan Germán Municipio 21 kmSan Sebastián Municipio 22 kmMaricao Municipio 25 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
67 km below the surface
Felt
no reports yet
Nearest
Añasco Municipio, 5 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2637 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 18.2490, -67.1625. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Añasco Municipio, PR 5 km (3 mi) SW of here earthquakes near Añasco Municipio
Hormigueros Municipio, PR 14 km (8 mi) NNW of here earthquakes near Hormigueros Municipio
Rincón Municipio, PR 14 km (8 mi) SE of here earthquakes near Rincón Municipio
Aguada Municipio, PR 14 km (9 mi) S of here earthquakes near Aguada Municipio
Moca Municipio, PR 17 km (10 mi) SSW of here earthquakes near Moca Municipio
Las Marías Municipio, PR 20 km (12 mi) W of here earthquakes near Las Marías Municipio

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

Aftershocks so far

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

  1. 1.8 3 km E of La Parguera, Puerto Rico
  2. 2.0 2 km SSW of Adjuntas, Puerto Rico
  3. 1.9 3 km NE of San Germán, Puerto Rico
  4. 2.1 10 km W of Mayagüez, Puerto Rico
  5. 1.6 1 km SSW of Pole Ojea, Puerto Rico
  6. 2.1 4 km SW of Añasco, Puerto Rico
  7. 2.0 1 km WSW of Pole Ojea, Puerto Rico
  8. 2.0 7 km W of Mayagüez, Puerto Rico
  9. 1.6 11 km S of Pole Ojea, Puerto Rico
  10. 2.0 9 km SSW of Pole Ojea, Puerto Rico
  11. 2.0 9 km S of Pole Ojea, Puerto Rico
  12. 2.4 9 km N of Quebradillas, Puerto Rico
  13. 2.3 5 km ENE of La Parguera, Puerto Rico
  14. 1.8 12 km NW of Puerto Real, Puerto Rico
  15. 1.7 1 km NE of Liborio Negron Torres, 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 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.