QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6md

20 km S of Arroyo, Puerto Rico

· 11 km deep · released about 6.8 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Arroyo Municipio 21 kmGuayama Municipio 24 kmPatillas Municipio 25 kmMaunabo Municipio 28 kmSalinas Municipio 32 kmYabucoa Municipio 36 kmCayey Municipio 38 kmSan Lorenzo Municipio 41 kmSanta Isabel Municipio 42 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 1.6 (md)
Depth
11 km below the surface
Felt
no reports yet
Nearest
Arroyo Municipio, 21 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3178 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 6.8 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,200,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,600,000× the energy of this one
  3. Around the size people start to feel M 3.0 140× the energy of this one
  4. This earthquake M 1.6 about 6.8 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 17.7820, -66.0380. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Arroyo Municipio, PR 21 km (13 mi) S of here earthquakes near Arroyo Municipio
Guayama Municipio, PR 24 km (15 mi) SSE of here earthquakes near Guayama Municipio
Patillas Municipio, PR 25 km (15 mi) SSW of here earthquakes near Patillas Municipio
Maunabo Municipio, PR 28 km (18 mi) SSW of here earthquakes near Maunabo Municipio
Salinas Municipio, PR 32 km (20 mi) SE of here earthquakes near Salinas Municipio
Yabucoa Municipio, PR 36 km (22 mi) SSW of here earthquakes near Yabucoa Municipio

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

Aftershocks so far

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

  1. 1.8 2 km S of Palmas, Puerto Rico
  2. 1.6 4 km SSE of Palmas, Puerto Rico
  3. 2.0 4 km S of Palmas, Puerto Rico
  4. 1.5 5 km SSW of Lamboglia, Puerto Rico
  5. 1.9 1 km NNE of Buena Vista, Puerto Rico
  6. 2.0 0 km S of Palmas, Puerto Rico
  7. 1.7 5 km SSW of Lamboglia, Puerto Rico
  8. 2.3 5 km SSW of Lamboglia, Puerto Rico
  9. 2.0 1 km NNE of Buena Vista, Puerto Rico
  10. 2.3 5 km SSW of Lamboglia, Puerto Rico
  11. 2.1 5 km SSW of Lamboglia, Puerto Rico
  12. 2.2 6 km SSW of Lamboglia, Puerto Rico
  13. 2.5 5 km S of Palmas, Puerto Rico
  14. 2.0 2 km N of Yaurel, Puerto Rico
  15. 1.7 3 km S of Palmas, 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 35,000 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.