QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

10 km SW of Gu?nica, Puerto Rico

· 12 km deep · released about 16 lb of TNT

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10 km30 km60 km120 km N Guánica Municipio 8 kmLajas Municipio 13 kmSabana Grande Municipio 21 kmGuayanilla Municipio 22 kmYauco Municipio 24 kmSan Germán Municipio 25 kmCabo Rojo Municipio 26 kmPeñuelas Municipio 29 kmHormigueros Municipio 31 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
12 km below the surface
Felt
no reports yet
Nearest
Guánica Municipio, 8 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 983 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 5.8 970,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 680,000× the energy of this one
  3. Around the size people start to feel M 3.0 61× 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 17.8920, -66.9643. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Guánica Municipio, PR 8 km (5 mi) SW of here earthquakes near Guánica Municipio
Lajas Municipio, PR 13 km (8 mi) SE of here earthquakes near Lajas Municipio
Sabana Grande Municipio, PR 21 km (13 mi) S of here earthquakes near Sabana Grande Municipio
Guayanilla Municipio, PR 22 km (13 mi) SW of here earthquakes near Guayanilla Municipio
Yauco Municipio, PR 24 km (15 mi) SSW of here earthquakes near Yauco Municipio
San Germán Municipio, PR 25 km (16 mi) SSE of here earthquakes near San Germán Municipio

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

Aftershocks so far

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

  1. 3.2 5 km WSW of Mayagüez, Puerto Rico
  2. 2.1 9 km SSW of Tallaboa, Puerto Rico
  3. 1.6 0 km NNE of Magas Arriba, Puerto Rico
  4. 2.5 4 km SE of La Parguera, Puerto Rico
  5. 2.5 Puerto Rico region
  6. 2.0 16 km S of Indios, Puerto Rico
  7. 2.4 5 km SE of Maria Antonia, Puerto Rico
  8. 2.3 5 km WSW of Guánica, Puerto Rico
  9. 2.2 11 km S of Guánica, Puerto Rico
  10. 2.6 11 km S of Guánica, Puerto Rico
  11. 2.0 3 km SW of La Parguera, Puerto Rico
  12. 1.9 2 km SSE of Guánica, Puerto Rico
  13. 2.2 4 km SW of Indios, Puerto Rico
  14. 2.1 6 km SW of Potala Pastillo, Puerto Rico
  15. 2.3 6 km WSW of Fuig, 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 6.4 on 2020-01-07 — it released about 7,700,000 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.