QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

33 km SSE of Emajagua, Puerto Rico

· 4.0 km deep · released about 14 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Maunabo Municipio 34 kmYabucoa Municipio 38 kmPatillas Municipio 40 kmArroyo Municipio 42 kmHumacao Municipio 44 kmGuayama Municipio 51 kmLas Piedras Municipio 52 kmSan Lorenzo Municipio 52 kmNaguabo Municipio 52 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
4.0 km below the surface
Felt
no reports yet
Nearest
Maunabo Municipio, 34 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2553 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 17.7395, -65.7276. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Maunabo Municipio, PR 34 km (21 mi) SSE of here earthquakes near Maunabo Municipio
Yabucoa Municipio, PR 38 km (24 mi) SSE of here earthquakes near Yabucoa Municipio
Patillas Municipio, PR 40 km (25 mi) SE of here earthquakes near Patillas Municipio
Arroyo Municipio, PR 42 km (26 mi) SE of here earthquakes near Arroyo Municipio
Humacao Municipio, PR 44 km (28 mi) S of here earthquakes near Humacao Municipio
Guayama Municipio, PR 51 km (31 mi) ESE of here earthquakes near Guayama 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. 3.2 21 km S of Esperanza, Puerto Rico
  2. 3.5 10 km SSE of Esperanza, Puerto Rico
  3. 3.4 26 km SSW of Esperanza, Puerto Rico
  4. 2.9 1 km SW of Arroyo, Puerto Rico
  5. 2.8 19 km SSE of Esperanza, Puerto Rico
  6. 1.7 9 km SE of Emajagua, Puerto Rico
  7. 2.3 2 km W of Humacao, Puerto Rico
  8. 2.9 62 km SSE of Emajagua, Puerto Rico
  9. 2.7 22 km SE of Emajagua, Puerto Rico
  10. 2.7 18 km SSW of Esperanza, Puerto Rico
  11. 2.1 13 km WSW of Esperanza, Puerto Rico
  12. 3.0 29 km S of Esperanza, Puerto Rico
  13. 2.6 23 km SE of Emajagua, Puerto Rico
  14. 2.8 7 km SW of Esperanza, Puerto Rico
  15. 2.3 5 km SSE of El Negro, 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 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.