QuakeIndex

Earthquake · reviewed by a seismologist

M 3.6md

4 km SSE of Tallaboa, Puerto Rico

· 10 km deep · released about 3.4 tons of TNT

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10 km30 km60 km120 km N Peñuelas Municipio 8 kmPonce Municipio 11 kmGuayanilla Municipio 11 kmYauco Municipio 22 kmJuana Díaz Municipio 23 kmGuánica Municipio 23 kmAdjuntas Municipio 25 kmSabana Grande Municipio 29 kmJayuya Municipio 31 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
56 reports · strongest reported intensity IV
Measured shaking
intensity III (ShakeMap)
Nearest
Peñuelas Municipio, 8 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2251 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 56 people have reported feeling it to USGS.

How big was it?

This earthquake released about 3.4 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 50,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 2,200× the energy of this one
  3. Magna, Utah 2020 M 5.7 1,600× the energy of this one
  4. This earthquake M 3.6 about 3.4 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 7.2× 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 17.9595, -66.7020. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Peñuelas Municipio, PR 8 km (5 mi) SSE of here earthquakes near Peñuelas Municipio
Ponce Municipio, PR 11 km (7 mi) WSW of here earthquakes near Ponce Municipio
Guayanilla Municipio, PR 11 km (7 mi) ESE of here earthquakes near Guayanilla Municipio
Yauco Municipio, PR 22 km (13 mi) SE of here earthquakes near Yauco Municipio
Juana Díaz Municipio, PR 23 km (14 mi) W of here earthquakes near Juana Díaz Municipio
Guánica Municipio, PR 23 km (15 mi) E of here earthquakes near Guánica Municipio

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

Aftershocks so far

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

  1. 2.9 3 km SSW of Guánica, Puerto Rico
  2. 2.5 5 km S of Indios, Puerto Rico
  3. 3.1 5 km WSW of Guánica, Puerto Rico
  4. 3.0 5 km SSW of Guánica, Puerto Rico
  5. 2.4 5 km S of Guánica, Puerto Rico
  6. 3.3 6 km SW of Guánica, Puerto Rico
  7. 2.4 17 km SSE of Guánica, Puerto Rico
  8. 2.1 10 km S of Ponce, Puerto Rico
  9. 2.0 5 km SW of Guánica, Puerto Rico
  10. 2.2 3 km WSW of Indios, Puerto Rico
  11. 1.9 14 km SSE of Guánica, Puerto Rico
  12. 2.2 5 km SSE of Guánica, Puerto Rico
  13. 3.1 11 km SSE of Guánica, Puerto Rico
  14. 2.2 3 km SW of Fuig, Puerto Rico
  15. 2.4 7 km SSE of Maria Antonia, 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 6.4 on 2020-01-07 — 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.