QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

1 km S of San Germán, Puerto Rico

· 27 km deep · released about 15 lb of TNT

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10 km30 km60 km120 km N San Germán Municipio 5 kmLajas Municipio 10 kmHormigueros Municipio 11 kmSabana Grande Municipio 11 kmCabo Rojo Municipio 16 kmMaricao Municipio 17 kmGuánica Municipio 19 kmLas Marías Municipio 19 kmYauco 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
27 km below the surface
Felt
no reports yet
Nearest
San Germán Municipio, 5 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2810 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 15 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 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 730,000× the energy of this one
  3. Around the size people start to feel M 3.0 65× the energy of this one
  4. This earthquake M 1.8 about 15 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 18.0655, -67.0475. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Germán Municipio, PR 5 km (3 mi) SSW of here earthquakes near San Germán Municipio
Lajas Municipio, PR 10 km (6 mi) N of here earthquakes near Lajas Municipio
Hormigueros Municipio, PR 11 km (7 mi) SE of here earthquakes near Hormigueros Municipio
Sabana Grande Municipio, PR 11 km (7 mi) WSW of here earthquakes near Sabana Grande Municipio
Cabo Rojo Municipio, PR 16 km (10 mi) ENE of here earthquakes near Cabo Rojo Municipio
Maricao Municipio, PR 17 km (10 mi) SW of here earthquakes near Maricao 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. 2.0 1 km WSW of Indios, Puerto Rico
  2. 1.8 7 km S of Indios, Puerto Rico
  3. 2.2 13 km W of Rincón, Puerto Rico
  4. 1.9 5 km NNW of Yauco, Puerto Rico
  5. 2.1 1 km N of Mayagüez, Puerto Rico
  6. 1.7 5 km SSW of Palmarejo, Puerto Rico
  7. 2.3 1 km W of Aguadilla, Puerto Rico
  8. 2.2 15 km SSE of La Parguera, Puerto Rico
  9. 2.7 2 km NW of Rafael Gonzalez, Puerto Rico
  10. 1.9 1 km SW of Indios, Puerto Rico
  11. 1.9 5 km NNW of Santo Domingo, Puerto Rico
  12. 1.7 4 km E of Espino, Puerto Rico
  13. 2.2 9 km WNW of Rincón, Puerto Rico
  14. 2.3 6 km WSW of Las Marías, Puerto Rico
  15. 1.5 5 km NE of La Parguera, 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.