QuakeIndex

Earthquake · reviewed by a seismologist

M 3.6md

4 km SSW of Bajandas, Puerto Rico

· 10 km deep · released about 4.5 tons of TNT

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10 km30 km60 km120 km N Humacao Municipio 2 kmYabucoa Municipio 10 kmLas Piedras Municipio 11 kmNaguabo Municipio 12 kmJuncos Municipio 17 kmMaunabo Municipio 17 kmSan Lorenzo Municipio 19 kmCeiba Municipio 24 kmPatillas Municipio 24 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
57 reports · strongest reported intensity IV
Measured shaking
intensity III (ShakeMap)
Nearest
Humacao Municipio, 2 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 862 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 57 people have reported feeling it to USGS.

How big was it?

This earthquake released about 4.5 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.7 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 38,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 1,700× the energy of this one
  3. Magna, Utah 2020 M 5.7 1,200× the energy of this one
  4. This earthquake M 3.6 about 4.5 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 9.4× 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 18.1191, -65.7948. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Humacao Municipio, PR 2 km (1 mi) SSW of here earthquakes near Humacao Municipio
Yabucoa Municipio, PR 10 km (6 mi) NE of here earthquakes near Yabucoa Municipio
Las Piedras Municipio, PR 11 km (7 mi) SE of here earthquakes near Las Piedras Municipio
Naguabo Municipio, PR 12 km (7 mi) SSW of here earthquakes near Naguabo Municipio
Juncos Municipio, PR 17 km (10 mi) SE of here earthquakes near Juncos Municipio
Maunabo Municipio, PR 17 km (11 mi) NE of here earthquakes near Maunabo Municipio

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

Aftershocks so far

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

  1. 2.5 3 km SW of G. L. Garcia, Puerto Rico
  2. 2.9 26 km SSE of Arroyo, Puerto Rico
  3. 2.8 18 km SSE of Lamboglia, Puerto Rico
  4. 2.8 10 km SW of Esperanza, Puerto Rico
  5. 2.2 0 km SSE of Isabel Segunda, Puerto Rico
  6. 2.5 5 km SE of El Negro, Puerto Rico
  7. 3.1 3 km NE of Martorell, Puerto Rico
  8. 3.2 21 km SSE of Lamboglia, Puerto Rico
  9. 3.5 14 km ESE of Esperanza, Puerto Rico
  10. 2.1 3 km E of Pastos, Puerto Rico
  11. 2.8 1 km ESE of Gurabo, Puerto Rico
  12. 1.9 4 km SSW of Comerío, Puerto Rico
  13. 2.5 21 km WSW of Esperanza, Puerto Rico
  14. 2.4 4 km SE of Arroyo, Puerto Rico
  15. 3.1 5 km SW of Las Piedras, 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 53 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.