QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8Md

44 km N of Loíza, Puerto Rico

· 19 km deep · released about 15 lb of TNT

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10 km30 km60 km120 km N Loíza Municipio 44 kmCarolina Municipio 50 kmSan Juan Municipio 50 kmRío Grande Municipio 52 kmCataño Municipio 52 kmToa Baja Municipio 54 kmLuquillo Municipio 55 kmCanóvanas Municipio 56 kmDorado Municipio 57 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
19 km below the surface
Felt
no reports yet
Nearest
Loíza Municipio, 44 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3702 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 18.8367, -65.8752. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Loíza Municipio, PR 44 km (27 mi) N of here earthquakes near Loíza Municipio
Carolina Municipio, PR 50 km (31 mi) NNE of here earthquakes near Carolina Municipio
San Juan Municipio, PR 50 km (31 mi) NNE of here earthquakes near San Juan Municipio
Río Grande Municipio, PR 52 km (32 mi) N of here earthquakes near Río Grande Municipio
Cataño Municipio, PR 52 km (32 mi) NNE of here earthquakes near Cataño Municipio
Toa Baja Municipio, PR 54 km (33 mi) NE of here earthquakes near Toa Baja Municipio

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

Aftershocks so far

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

  1. 2.8 21 km NNE of Luquillo, Puerto Rico
  2. 2.5 25 km N of Loíza, Puerto Rico
  3. 2.9 26 km N of Loíza, Puerto Rico
  4. 2.8 51 km NNE of Vieques, Puerto Rico
  5. 2.3 27 km NNE of Luquillo, Puerto Rico
  6. 3.1 76 km N of San Juan, Puerto Rico
  7. 3.0 23 km NE of Luquillo, Puerto Rico
  8. 2.3 27 km NNE of Luquillo, Puerto Rico
  9. 2.7 31 km NE of Vieques, Puerto Rico
  10. 2.2 33 km NNE of Luquillo, Puerto Rico
  11. 2.6 66 km N of San Juan, Puerto Rico
  12. 2.2 41 km N of San Juan, Puerto Rico
  13. 2.9 91 km NNE of San Juan, Puerto Rico
  14. 2.3 56 km N of Suárez, Puerto Rico
  15. 2.5 52 km NNE of Suárez, 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.