3.4
Earthquake Details: 31 km N of Isabela, Puerto Rico
Oct 28, 2026, 01:00:42
- Depth
- 9.52 km
- Felt reports
- No data
Source: USGSUpdated: Oct 28, 2026, 02:00 AM UTC
A magnitude 3.4 earthquake occurred on Oct 28, 2026 at 01:00:42. Epicenter: 31 km N of Isabela, Puerto Rico. Reported depth: 9.52 km.
Tsunami information
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Time & depth
- Local time
- Oct 27, 2026, 21:00:42 GMT-4
- UTC
- Oct 28, 2026, 01:00:42 UTC
9.52 km · Shallow-focus
Less than 70 km deep. Shaking is often stronger near the epicentre.
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Nearby major cities
Nearby earthquakes · 12
M3.258 km NNW of Charlotte Amalie, U.S. Virgin IslandsBeforeM3.265 km N of Culebra, Puerto RicoBeforeM3.465 km NNW of Charlotte Amalie, U.S. Virgin IslandsBeforeM3.171 km NNW of Charlotte Amalie, U.S. Virgin IslandsBeforeM3.485 km ENE of Christiansted, U.S. Virgin IslandsBeforeM3.139 km ESE of Cruz Bay, U.S. Virgin IslandsBeforeM3.369 km NE of Cruz Bay, U.S. Virgin IslandsBeforeM3.339 km WSW of Stella, Puerto RicoBeforeM5.1Puerto Rico regionAfterM4.121 km SE of Esperanza, Puerto RicoAfterM3.926 km S of Boca de Yuma, Dominican RepublicAfterM3.356 km N of Cruz Bay, U.S. Virgin IslandsAfter
Agency measurements
Agencies may use different observations and magnitude scales, and initial estimates can change.
- USGSM 3.37
pr71537763
- Depth:
- 9.52 km
- Time:
- Updated:
- Oct 28, 2026, 02:00 AM UTC
Technical Details
Depth9.52 km
Significance175
Latitude18.7813
Longitude-67.0493
Event IDpr71537763
Magnitude3.4
Updated:Oct 28, 2026, 02:00:38 UTC
Regional Seismicity
External Resources
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Earthquake information is automatically aggregated from the official seismic agencies listed below. Preliminary measurements can change as agencies review an event; use local emergency authorities for safety decisions. Latest successful data update: Oct 28, 2026, 02:00 UTC.
Data sources:
- USGS — Credit: U.S. Geological Survey.
- EMSC — Credit: EMSC/CSEM. Event catalogue data are provided under CC BY 4.0.
- JMA — Source: Japan Meteorological Agency (JMA).
- Geoscience Australia — Based on Australian Earthquakes data by Geoscience Australia. © Commonwealth of Australia. Licensed under CC BY 4.0; the section 5 disclaimer applies.
- GeoNet — We acknowledge the New Zealand GeoNet programme and its sponsors NHC, Earth Sciences NZ, LINZ, NEMA and MBIE for providing earthquake data.
- CENC / Wolfx — CENC earthquake parameters via Wolfx, an independent unofficial relay.
- GFZ / GEOFON — Locations, depths and magnitudes: GFZ/GEOFON using GEVN network data (CC BY 4.0).