QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8md

49 km S of Central Aguirre, Puerto Rico

· 26 km deep · released about 550 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Santa Isabel Municipio 49 kmSalinas Municipio 51 kmGuayama Municipio 54 kmJuana Díaz Municipio 57 kmArroyo Municipio 58 kmPonce Municipio 63 kmPatillas Municipio 63 kmCoamo Municipio 65 kmCayey Municipio 67 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 2.8 (md)
Depth
26 km below the surface
Felt
no reports yet
Nearest
Santa Isabel Municipio, 49 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 255 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

How big was it?

This earthquake released about 550 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 28,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 19,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.7× the energy of this one
  4. This earthquake M 2.8 about 550 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 17.5175, -66.3058. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Santa Isabel Municipio, PR 49 km (31 mi) S of here earthquakes near Santa Isabel Municipio
Salinas Municipio, PR 51 km (31 mi) S of here earthquakes near Salinas Municipio
Guayama Municipio, PR 54 km (33 mi) SSW of here earthquakes near Guayama Municipio
Juana Díaz Municipio, PR 57 km (35 mi) SSE of here earthquakes near Juana Díaz Municipio
Arroyo Municipio, PR 58 km (36 mi) SSW of here earthquakes near Arroyo Municipio
Ponce Municipio, PR 63 km (39 mi) SSE of here earthquakes near Ponce Municipio

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

Aftershocks so far

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

  1. 2.2 6 km SSE of Salinas, Puerto Rico
  2. 2.7 3 km SE of Jobos, Puerto Rico
  3. 2.1 2 km SE of Jobos, Puerto Rico
  4. 1.5 6 km S of Central Aguirre, Puerto Rico
  5. 2.4 3 km SSE of Salinas, Puerto Rico
  6. 2.3 23 km S of Ponce, Puerto Rico
  7. 1.9 3 km SSW of Salinas, Puerto Rico
  8. 2.7 5 km WSW of Central Aguirre, Puerto Rico
  9. 2.1 5 km WSW of Central Aguirre, 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 2019-03-12 — it released about 440 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.