QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

11 km S of Emajagua, Puerto Rico

· 12 km deep · released about 14 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Maunabo Municipio 11 kmPatillas Municipio 15 kmYabucoa Municipio 18 kmArroyo Municipio 18 kmGuayama Municipio 28 kmHumacao Municipio 28 kmSan Lorenzo Municipio 29 kmLas Piedras Municipio 32 kmCayey Municipio 36 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
Maunabo Municipio, 11 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2795 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 14 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 1,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 790,000× the energy of this one
  3. Around the size people start to feel M 3.0 70× the energy of this one
  4. This earthquake M 1.8 about 14 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 17.9000, -65.8880. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Maunabo Municipio, PR 11 km (7 mi) S of here earthquakes near Maunabo Municipio
Patillas Municipio, PR 15 km (9 mi) SE of here earthquakes near Patillas Municipio
Yabucoa Municipio, PR 18 km (11 mi) S of here earthquakes near Yabucoa Municipio
Arroyo Municipio, PR 18 km (11 mi) ESE of here earthquakes near Arroyo Municipio
Guayama Municipio, PR 28 km (17 mi) ESE of here earthquakes near Guayama Municipio
Humacao Municipio, PR 28 km (18 mi) SSW of here earthquakes near Humacao Municipio

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

Aftershocks so far

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

  1. 1.6 11 km SSE of Central Aguirre, Puerto Rico
  2. 1.6 Puerto Rico region
  3. 1.6 1 km NNE of Jobos, Puerto Rico
  4. 1.6 0 km ESE of Jobos, Puerto Rico
  5. 2.0 0 km WSW of Jobos, Puerto Rico
  6. 2.2 0 km NNE of Jobos, Puerto Rico
  7. 2.5 0 km NNW of Jobos, Puerto Rico
  8. 1.7 1 km NE of Jobos, Puerto Rico
  9. 2.6 0 km W of Jobos, Puerto Rico
  10. 2.1 0 km NNW of Jobos, Puerto Rico
  11. 2.2 0 km NNE of Jobos, Puerto Rico
  12. 1.7 0 km NE of Jobos, Puerto Rico
  13. 2.6 2 km NNE of Jobos, Puerto Rico
  14. 2.2 1 km SSW of Jobos, Puerto Rico
  15. 2.0 Puerto Rico region

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 18,000 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.