QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

4 km S of Caguas, Puerto Rico

· 12 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Caguas Municipio 2 kmSan Lorenzo Municipio 9 kmAguas Buenas Municipio 11 kmCidra Municipio 12 kmGurabo Municipio 12 kmCayey Municipio 14 kmJuncos Municipio 16 kmTrujillo Alto Municipio 17 kmComerío Municipio 18 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
Caguas Municipio, 2 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2988 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 5.7 710,000× the energy of this one
  3. Around the size people start to feel M 3.0 63× 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 18.1898, -66.0526. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Caguas Municipio, PR 2 km (1 mi) S of here earthquakes near Caguas Municipio
San Lorenzo Municipio, PR 9 km (6 mi) WNW of here earthquakes near San Lorenzo Municipio
Aguas Buenas Municipio, PR 11 km (7 mi) SE of here earthquakes near Aguas Buenas Municipio
Cidra Municipio, PR 12 km (7 mi) E of here earthquakes near Cidra Municipio
Gurabo Municipio, PR 12 km (7 mi) SW of here earthquakes near Gurabo Municipio
Cayey Municipio, PR 14 km (9 mi) NE of here earthquakes near Cayey Municipio

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

Aftershocks so far

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

  1. 3.1 4 km NNE of Bairoa, Puerto Rico
  2. 1.7 2 km SSE of Pájaros, Puerto Rico
  3. 1.6 4 km W of Central Aguirre, Puerto Rico
  4. 2.4 8 km NNE of Dorado, Puerto Rico
  5. 1.8 5 km SSW of Central Aguirre, Puerto Rico
  6. 2.4 4 km NNE of Guaynabo, Puerto Rico
  7. 1.9 1 km N of Las Ochenta, Puerto Rico
  8. 2.2 5 km ESE of G. L. Garcia, Puerto Rico
  9. 2.7 5 km ESE of San Juan, Puerto Rico
  10. 2.0 0 km NW of Playita Cortada, Puerto Rico
  11. 2.1 3 km ESE of Cayey, Puerto Rico
  12. 2.4 2 km SSE of Cidra, Puerto Rico
  13. 2.5 17 km SSE of Jobos, Puerto Rico
  14. 2.5 3 km WSW of Sumidero, Puerto Rico
  15. 1.5 3 km W of Palo Seco, 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 16,000 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.