QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6md

Earthquake near Esperanza, PR

No earthquake was likely felt in Esperanza in the 24 hours to 9:45 am AST (13:45 UTC). The last one was M 2.9, 23 km (14 mi) SE, at 12:08 pm AST on 29 October 2026, estimated intensity II (weak) in town. Every earthquake near Esperanza

This page: a magnitude 1.6 earthquake was recorded 19 km (12 mi) southwest of Esperanza, PR, at 9:48 pm AST on 26 July 2017 (01:48 UTC), 21 km deep.

USGS: 19 km SW of Esperanza, Puerto Rico

68 km (42 mi) SE of San Juan, PR · 54 km (34 mi) ESE of Caguas, PR

9:48 pm AST, Jul 26, 2017 · · 21 km deep · released about 8.7 lb of TNT

Every earthquake near Esperanza Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Vieques Municipio 25 kmHumacao Municipio 26 kmYabucoa Municipio 29 kmNaguabo Municipio 30 kmCeiba Municipio 31 kmMaunabo Municipio 31 kmLas Piedras Municipio 37 kmPatillas Municipio 41 kmJuncos 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
9:48 pm AST on 26 July 2017 ()
Where
19 km (12 mi) southwest of Esperanza, PR · earthquakes near Esperanza
Magnitude
M 1.6 (md)
Depth
21 km below the surface
Felt
no reports yet
Nearest
Vieques Municipio, 25 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3396 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 Esperanza, 19 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: Isabel Segunda, Punta Santiago, El Negro, Bajandas, Comunas, Candelero Arriba.

How big was it?

This earthquake released about 8.7 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 1,700,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,200,000× the energy of this one
  3. Around the size people start to feel M 3.0 110× the energy of this one
  4. This earthquake M 1.6 about 8.7 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 28,000 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 17.9750, -65.6025. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Vieques Municipio, PR 25 km (15 mi) NE earthquakes near Vieques Municipio
Humacao Municipio, PR 26 km (16 mi) NW earthquakes near Humacao Municipio
Yabucoa Municipio, PR 29 km (18 mi) WNW earthquakes near Yabucoa Municipio
Naguabo Municipio, PR 30 km (19 mi) NNW earthquakes near Naguabo Municipio
Ceiba Municipio, PR 31 km (19 mi) N earthquakes near Ceiba Municipio
Maunabo Municipio, PR 31 km (19 mi) W earthquakes near Maunabo Municipio

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

Aftershocks so far

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

  1. 2.8 19 km SSW of Esperanza, Puerto Rico
  2. 1.5 3 km SSW of Arroyo, Puerto Rico
  3. 3.1 4 km SSE of Palo Seco, Puerto Rico
  4. 3.3 9 km SE of Esperanza, Puerto Rico
  5. 2.8 18 km SSE of Arroyo, Puerto Rico
  6. 2.5 21 km SE of Esperanza, Puerto Rico
  7. 2.6 9 km SSE of Aguas Claras, Puerto Rico
  8. 3.1 12 km SE of Punta Santiago, Puerto Rico
  9. 2.7 2 km NW of Candelero Arriba, Puerto Rico
  10. 2.6 16 km SSE of Punta Santiago, Puerto Rico
  11. 3.1 2 km ENE of Candelero Arriba, Puerto Rico
  12. 2.3 3 km NNW of Patillas, Puerto Rico
  13. 3.0 26 km SSW of Esperanza, Puerto Rico
  14. 2.6 2 km NNW of El Negro, Puerto Rico
  15. 2.8 1 km NNE of Yabucoa, 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.