QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

1 km NNW of Mayagüez, Puerto Rico

· 29 km deep · released about 13 lb of TNT

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10 km30 km60 km120 km N Añasco Municipio 8 kmHormigueros Municipio 10 kmSan Germán Municipio 17 kmRincón Municipio 18 kmLas Marías Municipio 18 kmAguada Municipio 18 kmMoca Municipio 19 kmSan Sebastián Municipio 23 kmMaricao 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 1.8 (md)
Depth
29 km below the surface
Felt
no reports yet
Nearest
Añasco Municipio, 8 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2868 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 18.2156, -67.1471. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Añasco Municipio, PR 8 km (5 mi) SSW of here earthquakes near Añasco Municipio
Hormigueros Municipio, PR 10 km (6 mi) NNW of here earthquakes near Hormigueros Municipio
San Germán Municipio, PR 17 km (10 mi) NW of here earthquakes near San Germán Municipio
Rincón Municipio, PR 18 km (11 mi) SE of here earthquakes near Rincón Municipio
Las Marías Municipio, PR 18 km (11 mi) W of here earthquakes near Las Marías Municipio
Aguada Municipio, PR 18 km (11 mi) SSE of here earthquakes near Aguada Municipio

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

Aftershocks so far

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

  1. 2.1 6 km ENE of Espino, Puerto Rico
  2. 2.3 16 km WSW of Stella, Puerto Rico
  3. 1.6 3 km SSE of Mayagüez, Puerto Rico
  4. 2.5 2 km NW of Mayagüez, Puerto Rico
  5. 1.9 4 km WSW of Maricao, Puerto Rico
  6. 2.0 7 km WSW of Maricao, Puerto Rico
  7. 2.3 17 km W of Pole Ojea, Puerto Rico
  8. 2.8 3 km W of Mayagüez, Puerto Rico
  9. 1.9 5 km SSW of Adjuntas, Puerto Rico
  10. 2.3 36 km W of Rincón, Puerto Rico
  11. 2.0 17 km S of Pole Ojea, Puerto Rico
  12. 1.8 10 km SSE of La Parguera, Puerto Rico
  13. 2.5 6 km WSW of Stella, Puerto Rico
  14. 1.5 Puerto Rico region
  15. 2.1 1 km NNW of Sabana Grande, 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.