QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6md

Earthquake near El Negro, PR

No earthquake was likely felt in El Negro in the 24 hours to 10:47 am AST (14:47 UTC). The last one was M 2.2, 7 km (5 mi) SSE, at 2:59 pm AST on 4 November 2026, estimated intensity II (weak) in town. Every earthquake near El Negro

This page: a magnitude 1.6 earthquake was recorded 26 km (16 mi) east-southeast of El Negro, PR, at 4:33 am AST on 1 October 2019 (08:33 UTC), 34 km deep.

USGS: 25 km ESE of El Negro, Puerto Rico

70 km (44 mi) SE of San Juan, PR · 55 km (34 mi) SE of Caguas, PR

4:33 am AST, Oct 1, 2019 · · 34 km deep · released about 7.8 lb of TNT

Every earthquake near El Negro Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Yabucoa Municipio 28 kmMaunabo Municipio 28 kmHumacao Municipio 29 kmVieques Municipio 32 kmNaguabo Municipio 34 kmCeiba Municipio 38 kmPatillas Municipio 38 kmLas Piedras Municipio 39 kmArroyo Municipio 43 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
4:33 am AST on 1 October 2019 ()
Where
26 km (16 mi) east-southeast of El Negro, PR · earthquakes near El Negro
Magnitude
M 1.6 (md)
Depth
34 km below the surface
Felt
no reports yet
Nearest
Yabucoa Municipio, 28 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2598 days ago

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

At this magnitude and depth it was probably too small to be felt, even directly above it. In El Negro, 26 km away, the estimate is intensity I (not felt). 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: Esperanza, Emajagua, Comunas, Maunabo, Candelero Arriba, Yabucoa.

How big was it?

This earthquake released about 7.8 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,900,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,400,000× the energy of this one
  3. Around the size people start to feel M 3.0 120× the energy of this one
  4. This earthquake M 1.6 about 7.8 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 since 2016 was M 4.6 on 2016-12-05 — about 31,000 times the energy of this one.

Before 2016, the USGS record since 1900 lists no earthquake of M5 or more within 50 km.

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 17.9161, -65.6420. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Yabucoa Municipio, PR 28 km (17 mi) NW earthquakes near Yabucoa Municipio
Maunabo Municipio, PR 28 km (18 mi) WNW earthquakes near Maunabo Municipio
Humacao Municipio, PR 29 km (18 mi) NNW earthquakes near Humacao Municipio
Vieques Municipio, PR 32 km (20 mi) NE earthquakes near Vieques Municipio
Naguabo Municipio, PR 34 km (21 mi) NNW earthquakes near Naguabo Municipio
Ceiba Municipio, PR 38 km (23 mi) N earthquakes near Ceiba Municipio

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

Aftershocks so far

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

  1. 2.9 23 km SE of Emajagua, Puerto Rico
  2. 3.0 21 km SE of El Negro, Puerto Rico
  3. 3.2 21 km S of Esperanza, Puerto Rico
  4. 3.7 14 km N of Isabel Segunda, Puerto Rico
  5. 3.5 10 km SSE of Esperanza, Puerto Rico
  6. 3.4 26 km SSW of Esperanza, Puerto Rico
  7. 3.4 3 km E of Esperanza, Puerto Rico
  8. 2.9 1 km SW of Arroyo, Puerto Rico
  9. 2.1 4 km N of Yaurel, Puerto Rico
  10. 2.8 19 km SSE of Esperanza, Puerto Rico
  11. 1.7 9 km SE of Emajagua, Puerto Rico
  12. 2.2 6 km N of Yaurel, Puerto Rico
  13. 1.5 5 km N of Yaurel, Puerto Rico
  14. 2.3 2 km W of Humacao, Puerto Rico
  15. 2.7 22 km SE of Emajagua, 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.