QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

4 km NNW of Mayagüez, Puerto Rico

· 5.0 km deep · released about 46 lb of TNT

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10 km30 km60 km120 km N Añasco Municipio 7 kmHormigueros Municipio 12 kmRincón Municipio 15 kmAguada Municipio 16 kmMoca Municipio 18 kmSan Germán Municipio 19 kmLas Marías Municipio 19 kmSan Sebastián Municipio 23 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 2.1 (md)
Depth
5.0 km below the surface
Felt
no reports yet
Nearest
Añasco Municipio, 7 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2940 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 46 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 330,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 230,000× the energy of this one
  3. Around the size people start to feel M 3.0 21× the energy of this one
  4. This earthquake M 2.1 about 46 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 18.2341, -67.1616. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Añasco Municipio, PR 7 km (4 mi) SSW of here earthquakes near Añasco Municipio
Hormigueros Municipio, PR 12 km (7 mi) NNW of here earthquakes near Hormigueros Municipio
Rincón Municipio, PR 15 km (9 mi) SE of here earthquakes near Rincón Municipio
Aguada Municipio, PR 16 km (10 mi) S of here earthquakes near Aguada Municipio
Moca Municipio, PR 18 km (11 mi) SSW of here earthquakes near Moca Municipio
San Germán Municipio, PR 19 km (12 mi) NW of here earthquakes near San Germán Municipio

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

Aftershocks so far

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

  1. 2.1 2 km E of San Sebastián, Puerto Rico
  2. 1.9 4 km SW of Adjuntas, Puerto Rico
  3. 2.3 15 km WSW of Puerto Real, Puerto Rico
  4. 2.4 10 km NW of Puerto Real, Puerto Rico
  5. 2.1 5 km NW of Puerto Real, Puerto Rico
  6. 2.3 6 km W of Boquerón, Puerto Rico
  7. 2.2 27 km WNW of Aguadilla, Puerto Rico
  8. 2.4 22 km W of Pole Ojea, Puerto Rico
  9. 2.1 5 km SE of Lajas, Puerto Rico
  10. 2.5 7 km E of Mayagüez, Puerto Rico
  11. 1.9 8 km NW of Santo Domingo, Puerto Rico
  12. 1.8 4 km NNE of Yauco, Puerto Rico
  13. 1.7 6 km SW of Guánica, Puerto Rico
  14. 1.8 1 km W of Mayagüez, Puerto Rico
  15. 2.0 6 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.3 on 2017-10-14 — it released about 1,900 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.