QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

5 km SSE of Central Aguirre, Puerto Rico

· 12 km deep · released about 23 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Salinas Municipio 10 kmGuayama Municipio 10 kmArroyo Municipio 19 kmSanta Isabel Municipio 20 kmCayey Municipio 23 kmPatillas Municipio 25 kmAibonito Municipio 26 kmCoamo Municipio 28 kmCidra Municipio 30 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 1.9 (md)
Depth
12 km below the surface
Felt
no reports yet
Nearest
Salinas Municipio, 10 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2815 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 23 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 660,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 470,000× the energy of this one
  3. Around the size people start to feel M 3.0 42× the energy of this one
  4. This earthquake M 1.9 about 23 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 17.9033, -66.2033. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Salinas Municipio, PR 10 km (6 mi) SE of here earthquakes near Salinas Municipio
Guayama Municipio, PR 10 km (7 mi) SW of here earthquakes near Guayama Municipio
Arroyo Municipio, PR 19 km (12 mi) WSW of here earthquakes near Arroyo Municipio
Santa Isabel Municipio, PR 20 km (13 mi) ESE of here earthquakes near Santa Isabel Municipio
Cayey Municipio, PR 23 km (14 mi) SSW of here earthquakes near Cayey Municipio
Patillas Municipio, PR 25 km (16 mi) WSW of here earthquakes near Patillas Municipio

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

Aftershocks so far

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

  1. 2.3 1 km E of Cidra, Puerto Rico
  2. 2.0 3 km E of Naranjito, Puerto Rico
  3. 2.5 1 km SSW of Bayamon, Puerto Rico
  4. 1.9 5 km SE of Arroyo, Puerto Rico
  5. 1.7 1 km NW of Parcelas Peñuelas, Puerto Rico
  6. 2.0 9 km SE of Arroyo, Puerto Rico
  7. 1.8 1 km NW of Aguas Buenas, Puerto Rico
  8. 2.0 Puerto Rico region
  9. 2.5 16 km S of Jobos, Puerto Rico
  10. 2.6 37 km SSE of Arroyo, Puerto Rico
  11. 2.0 5 km NNE of Ponce, Puerto Rico
  12. 1.9 4 km N of Ponce, Puerto Rico
  13. 2.4 15 km S of Jobos, Puerto Rico
  14. 2.9 3 km N of Naranjito, Puerto Rico
  15. 1.6 1 km ESE of Los Llanos, 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 10,000 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.