QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

2 km WNW of Hormigueros, Puerto Rico

· 16 km deep · released about 13 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Hormigueros Municipio 4 kmSan Germán Municipio 12 kmAñasco Municipio 16 kmCabo Rojo Municipio 17 kmLas Marías Municipio 20 kmLajas Municipio 22 kmSabana Grande Municipio 22 kmMaricao Municipio 23 kmRincón Municipio 24 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
16 km below the surface
Felt
no reports yet
Nearest
Hormigueros Municipio, 4 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2653 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 13 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 1,200,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 840,000× the energy of this one
  3. Around the size people start to feel M 3.0 75× the energy of this one
  4. This earthquake M 1.8 about 13 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 18.1458, -67.1476. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Hormigueros Municipio, PR 4 km (2 mi) WNW of here earthquakes near Hormigueros Municipio
San Germán Municipio, PR 12 km (8 mi) WNW of here earthquakes near San Germán Municipio
Añasco Municipio, PR 16 km (10 mi) S of here earthquakes near Añasco Municipio
Cabo Rojo Municipio, PR 17 km (11 mi) NNE of here earthquakes near Cabo Rojo Municipio
Las Marías Municipio, PR 20 km (13 mi) WSW of here earthquakes near Las Marías Municipio
Lajas Municipio, PR 22 km (14 mi) NNW of here earthquakes near Lajas 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 1 km ESE of Stella, Puerto Rico
  2. 2.0 6 km NNE of Sabana Eneas, Puerto Rico
  3. 2.3 3 km ENE of Espino, Puerto Rico
  4. 1.9 8 km N of Yauco, Puerto Rico
  5. 1.5 22 km W of Pole Ojea, Puerto Rico
  6. 2.5 25 km NW of Rincón, Puerto Rico
  7. 2.5 5 km NNE of Isabela, Puerto Rico
  8. 2.1 2 km E of Mayagüez, Puerto Rico
  9. 1.7 5 km NNE of Sabana Grande, Puerto Rico
  10. 1.8 4 km SSW of Añasco, Puerto Rico
  11. 1.9 6 km NW of Adjuntas, Puerto Rico
  12. 1.6 5 km NNE of Sabana Grande, Puerto Rico
  13. 2.4 5 km NNE of Sabana Grande, Puerto Rico
  14. 1.6 7 km ESE of Las Marías, Puerto Rico
  15. 2.0 8 km W 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 6,700 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.