QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

3 km ENE of San Germán, Puerto Rico

· 11 km deep · released about 13 lb of TNT

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10 km30 km60 km120 km N San Germán Municipio 3 kmSabana Grande Municipio 7 kmHormigueros Municipio 12 kmMaricao Municipio 13 kmLajas Municipio 13 kmLas Marías Municipio 16 kmYauco Municipio 17 kmGuánica Municipio 19 kmCabo Rojo 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
11 km below the surface
Felt
no reports yet
Nearest
San Germán Municipio, 3 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2839 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 18.0910, -67.0158. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Germán Municipio, PR 3 km (2 mi) SE of here earthquakes near San Germán Municipio
Sabana Grande Municipio, PR 7 km (5 mi) W of here earthquakes near Sabana Grande Municipio
Hormigueros Municipio, PR 12 km (7 mi) ESE of here earthquakes near Hormigueros Municipio
Maricao Municipio, PR 13 km (8 mi) SW of here earthquakes near Maricao Municipio
Lajas Municipio, PR 13 km (8 mi) NNE of here earthquakes near Lajas Municipio
Las Marías Municipio, PR 16 km (10 mi) SSW of here earthquakes near Las Marías Municipio

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

Aftershocks so far

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

  1. 1.9 0 km NNW of Puerto Real, Puerto Rico
  2. 1.8 7 km S of Tallaboa, Puerto Rico
  3. 2.2 9 km S of Tallaboa, Puerto Rico
  4. 2.3 8 km WSW of Mayagüez, Puerto Rico
  5. 2.3 7 km NNW of Puerto Real, Puerto Rico
  6. 1.9 3 km SW of Adjuntas, Puerto Rico
  7. 1.5 6 km NNE of Lluveras, Puerto Rico
  8. 2.6 7 km NNE of Lluveras, Puerto Rico
  9. 1.6 1 km E of Liborio Negron Torres, Puerto Rico
  10. 1.7 15 km SSE of Pole Ojea, Puerto Rico
  11. 1.8 13 km WNW of Puerto Real, Puerto Rico
  12. 1.8 8 km S of Tallaboa, Puerto Rico
  13. 1.8 11 km W of Adjuntas, Puerto Rico
  14. 1.6 3 km NNW of Isabela, Puerto Rico
  15. 1.8 5 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.

On USGS

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