QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

2 km SSW of Mayagüez, Puerto Rico

· 7.0 km deep · released about 40 lb of TNT

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10 km30 km60 km120 km N Hormigueros Municipio 6 kmAñasco Municipio 12 kmSan Germán Municipio 14 kmLas Marías Municipio 18 kmRincón Municipio 21 kmCabo Rojo Municipio 21 kmAguada Municipio 22 kmMaricao Municipio 22 kmMoca Municipio 23 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
7.0 km below the surface
Felt
no reports yet
Nearest
Hormigueros Municipio, 6 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2901 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 40 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 5.8 380,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 270,000× the energy of this one
  3. Around the size people start to feel M 3.0 24× the energy of this one
  4. This earthquake M 2.1 about 40 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 18.1835, -67.1455. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Hormigueros Municipio, PR 6 km (4 mi) NNW of here earthquakes near Hormigueros Municipio
Añasco Municipio, PR 12 km (7 mi) S of here earthquakes near Añasco Municipio
San Germán Municipio, PR 14 km (9 mi) NW of here earthquakes near San Germán Municipio
Las Marías Municipio, PR 18 km (11 mi) WSW of here earthquakes near Las Marías Municipio
Rincón Municipio, PR 21 km (13 mi) SSE of here earthquakes near Rincón Municipio
Cabo Rojo Municipio, PR 21 km (13 mi) N of here earthquakes near Cabo Rojo Municipio

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

Aftershocks so far

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

  1. 1.8 5 km ENE of Mayagüez, Puerto Rico
  2. 2.8 33 km W of Pole Ojea, Puerto Rico
  3. 2.8 30 km WSW of Stella, Puerto Rico
  4. 2.6 16 km W of Puerto Real, Puerto Rico
  5. 2.1 24 km NE of Stella, Puerto Rico
  6. 2.0 9 km NW of Puerto Real, Puerto Rico
  7. 2.6 4 km NW of Mayagüez, Puerto Rico
  8. 2.2 1 km SW of Mayagüez, Puerto Rico
  9. 2.0 4 km NNW of Puerto Real, Puerto Rico
  10. 2.1 19 km SW of Stella, Puerto Rico
  11. 2.0 6 km E of Pole Ojea, Puerto Rico
  12. 2.0 9 km WNW of Puerto Real, Puerto Rico
  13. 2.3 20 km SSE of Pole Ojea, Puerto Rico
  14. 2.2 5 km N of Puerto Real, Puerto Rico
  15. 2.5 6 km N 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 2,100 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.