QuakeIndex

Earthquake · reviewed by a seismologist

M 3.6md

21 km ESE of Emajagua, Puerto Rico

· 10 km deep · released about 3.7 tons of TNT

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10 km30 km60 km120 km N Maunabo Municipio 23 kmYabucoa Municipio 25 kmHumacao Municipio 28 kmPatillas Municipio 32 kmNaguabo Municipio 35 kmArroyo Municipio 36 kmLas Piedras Municipio 37 kmVieques Municipio 39 kmSan Lorenzo Municipio 40 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 3.6 (md)
Depth
10 km below the surface
Felt
no reports yet
Nearest
Maunabo Municipio, 23 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1640 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 3.7 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.6 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 46,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 2,100× the energy of this one
  3. Magna, Utah 2020 M 5.7 1,500× the energy of this one
  4. This earthquake M 3.6 about 3.7 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 7.7× more

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 17.8930, -65.7081. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Maunabo Municipio, PR 23 km (14 mi) ESE of here earthquakes near Maunabo Municipio
Yabucoa Municipio, PR 25 km (15 mi) SE of here earthquakes near Yabucoa Municipio
Humacao Municipio, PR 28 km (18 mi) SSE of here earthquakes near Humacao Municipio
Patillas Municipio, PR 32 km (20 mi) ESE of here earthquakes near Patillas Municipio
Naguabo Municipio, PR 35 km (22 mi) S of here earthquakes near Naguabo Municipio
Arroyo Municipio, PR 36 km (23 mi) ESE of here earthquakes near Arroyo Municipio

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

Aftershocks so far

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

  1. 3.0 28 km SE of El Negro, Puerto Rico
  2. 3.7 4 km E of Punta Santiago, Puerto Rico
  3. 3.1 5 km ESE of Punta Santiago, Puerto Rico
  4. 2.9 18 km SW of Esperanza, Puerto Rico
  5. 2.9 13 km SE of Esperanza, Puerto Rico
  6. 3.3 27 km SSE of Jobos, Puerto Rico
  7. 2.6 5 km WNW of Jagual, Puerto Rico
  8. 2.8 17 km SSE of Esperanza, Puerto Rico
  9. 2.5 23 km S of Arroyo, Puerto Rico
  10. 2.4 7 km SSE of Jobos, Puerto Rico
  11. 2.8 2 km SE of Jobos, Puerto Rico
  12. 2.0 5 km ESE of Jobos, Puerto Rico
  13. 2.1 3 km SSE of Jobos, Puerto Rico
  14. 2.5 2 km SSE of Jobos, Puerto Rico
  15. 2.8 3 km ESE of Jobos, 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 4.8 on 2021-10-08 — it released about 65 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.