QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

0 km E of Maricao, Puerto Rico

· 25 km deep · released about 16 lb of TNT

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10 km30 km60 km120 km N Maricao Municipio 4 kmLas Marías Municipio 5 kmSan Germán Municipio 11 kmSabana Grande Municipio 11 kmLares Municipio 15 kmHormigueros Municipio 16 kmYauco Municipio 16 kmSan Sebastián Municipio 17 kmAñasco Municipio 20 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
25 km below the surface
Felt
no reports yet
Nearest
Maricao Municipio, 4 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2943 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 16 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 5.8 930,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 660,000× the energy of this one
  3. Around the size people start to feel M 3.0 59× the energy of this one
  4. This earthquake M 1.8 about 16 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 18.1815, -66.9730. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Maricao Municipio, PR 4 km (3 mi) WNW of here earthquakes near Maricao Municipio
Las Marías Municipio, PR 5 km (3 mi) S of here earthquakes near Las Marías Municipio
San Germán Municipio, PR 11 km (7 mi) NE of here earthquakes near San Germán Municipio
Sabana Grande Municipio, PR 11 km (7 mi) NNW of here earthquakes near Sabana Grande Municipio
Lares Municipio, PR 15 km (9 mi) SW of here earthquakes near Lares Municipio
Hormigueros Municipio, PR 16 km (10 mi) ENE of here earthquakes near Hormigueros 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. 2.0 6 km ESE of Maricao, Puerto Rico
  2. 1.7 4 km S of La Playa, Puerto Rico
  3. 1.8 2 km ESE of Sabana Grande, Puerto Rico
  4. 1.9 3 km NE of San Germán, Puerto Rico
  5. 2.9 16 km WSW of Stella, Puerto Rico
  6. 1.9 19 km WNW of Puerto Real, Puerto Rico
  7. 2.4 10 km WSW of Stella, Puerto Rico
  8. 1.8 1 km SSE of Adjuntas, Puerto Rico
  9. 1.9 3 km NE of Mayagüez, Puerto Rico
  10. 1.9 3 km SSE of Maricao, Puerto Rico
  11. 1.9 5 km N of Arecibo, Puerto Rico
  12. 2.0 11 km WNW of Puerto Real, Puerto Rico
  13. 1.8 5 km SW of Adjuntas, Puerto Rico
  14. 1.9 2 km S of Añasco, Puerto Rico
  15. 2.1 3 km SW of Las Marías, 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.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.