QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

7 km ESE of G. L. Garcia, Puerto Rico

· 26 km deep · released about 16 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Lorenzo Municipio 10 kmCayey Municipio 11 kmPatillas Municipio 12 kmCaguas Municipio 13 kmArroyo Municipio 14 kmCidra Municipio 15 kmGuayama Municipio 16 kmMaunabo Municipio 19 kmAguas Buenas 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
26 km below the surface
Felt
no reports yet
Nearest
San Lorenzo Municipio, 10 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 211 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 18.0935, -66.0477. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Lorenzo Municipio, PR 10 km (6 mi) SW of here earthquakes near San Lorenzo Municipio
Cayey Municipio, PR 11 km (7 mi) E of here earthquakes near Cayey Municipio
Patillas Municipio, PR 12 km (8 mi) NNW of here earthquakes near Patillas Municipio
Caguas Municipio, PR 13 km (8 mi) S of here earthquakes near Caguas Municipio
Arroyo Municipio, PR 14 km (8 mi) N of here earthquakes near Arroyo Municipio
Cidra Municipio, PR 15 km (9 mi) SE of here earthquakes near Cidra Municipio

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

Aftershocks so far

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

  1. 3.1 4 km N of San Juan, Puerto Rico
  2. 2.1 7 km S of Salinas, Puerto Rico
  3. 2.2 5 km ENE of Comerío, Puerto Rico
  4. 2.2 3 km SSW of Salinas, Puerto Rico
  5. 2.0 8 km S of Salinas, Puerto Rico
  6. 1.9 1 km E of Salinas, Puerto Rico
  7. 2.2 3 km W of Vázquez, Puerto Rico
  8. 1.9 6 km S of Salinas, Puerto Rico
  9. 2.1 6 km S of Salinas, Puerto Rico
  10. 1.9 11 km S of Emajagua, Puerto Rico
  11. 2.0 5 km SSE of Salinas, Puerto Rico
  12. 2.4 7 km S of Salinas, Puerto Rico
  13. 2.6 15 km WSW of Esperanza, Puerto Rico
  14. 2.1 7 km WSW of Naranjito, Puerto Rico
  15. 2.7 21 km SSE of Emajagua, 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 4.6 on 2016-12-05 — it released about 15,000 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.