QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

Earthquake near Ponce, PR

No earthquake was likely felt in Ponce in the 24 hours to 3:05 pm AST (19:05 UTC). The last one was M 3.0, 26 km (16 mi) WSW, at 3:45 am AST on 8 November 2026, estimated intensity II (weak) in town. Every earthquake near Ponce

This page: a magnitude 1.8 earthquake was recorded 33 km (20 mi) west-southwest of Ponce, PR, at 11:47 pm AST on 28 December 2019 (03:47 UTC), 8.0 km deep.

USGS: Puerto Rico region

32 km (20 mi) WSW of Ponce, PR

11:47 pm AST, Dec 28, 2019 · · 8.0 km deep · released about 17 lb of TNT

Every earthquake near Ponce Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Guánica Municipio 7 kmGuayanilla Municipio 18 kmLajas Municipio 18 kmSabana Grande Municipio 23 kmYauco Municipio 23 kmPeñuelas Municipio 24 kmSan Germán Municipio 29 kmCabo Rojo Municipio 32 kmMaricao Municipio 32 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
11:47 pm AST on 28 December 2019 ()
Where
33 km (20 mi) west-southwest of Ponce, PR · earthquakes near Ponce
Magnitude
M 1.8 (md)
Depth
8.0 km below the surface
Felt
no reports yet
Nearest
Guánica Municipio, 7 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2509 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

At this magnitude and depth, people at rest would likely notice it out to about 11 km (7 mi) from the epicentre. In Ponce, 33 km away, the estimate is intensity II (weak). Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.

Earthquakes near other towns within 30 km: Guánica, Maria Antonia, Fuig, Palomas, Indios, Lluveras.

How big was it?

This earthquake released about 17 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 5.8 900,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 640,000× the energy of this one
  3. Around the size people start to feel M 3.0 57× the energy of this one
  4. This earthquake M 1.8 about 17 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.

For this area

The largest earthquake within 50 km in our catalogue was M 5.0 on 2019-12-29 — about 57,000 times the energy of this one.

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Epicentre 17.8846, -66.9045. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Guánica Municipio, PR 7 km (5 mi) NNW earthquakes near Guánica Municipio
Guayanilla Municipio, PR 18 km (11 mi) NE earthquakes near Guayanilla Municipio
Lajas Municipio, PR 18 km (11 mi) NW earthquakes near Lajas Municipio
Sabana Grande Municipio, PR 23 km (14 mi) NNW earthquakes near Sabana Grande Municipio
Yauco Municipio, PR 23 km (14 mi) NNE earthquakes near Yauco Municipio
Peñuelas Municipio, PR 24 km (15 mi) NE earthquakes near Peñuelas Municipio

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

Aftershocks so far

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

  1. 2.2 6 km NW of Puerto Real, Puerto Rico
  2. 1.6 5 km SSE of Guánica, Puerto Rico
  3. 1.8 10 km SE of Maria Antonia, Puerto Rico
  4. 2.5 13 km S of Indios, Puerto Rico
  5. 1.6 9 km SSE of Guánica, Puerto Rico
  6. 2.0 8 km S of Indios, Puerto Rico
  7. 2.5 11 km S of Indios, Puerto Rico
  8. 1.6 12 km SSE of Guánica, Puerto Rico
  9. 2.7 11 km SSE of Maria Antonia, Puerto Rico
  10. 2.0 2 km SE of Yauco, Puerto Rico
  11. 1.8 13 km SSE of Guánica, Puerto Rico
  12. 1.6 9 km SSE of Maria Antonia, Puerto Rico
  13. 1.7 12 km S of Indios, Puerto Rico
  14. 2.6 8 km SSE of Maria Antonia, Puerto Rico
  15. 1.6 11 km S of Guánica, 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.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.