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Significant earthquake

This summarises a recorded earthquake only; it is not a warning or a prediction. Follow AFAD and the competent authorities for official statements and guidance.

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4.1

21 km SE of Esperanza, Puerto Rico

28 October 2026, 12:44:00 (+03) 2026-10-28 09:44:00 UTC

2 sources: EMSC, USGS md
Did you feel this earthquake?
Magnitude
4.1 md
Depth
25.0 km
Coordinates
17.9548, -65.3388
Data consistency
88/100

Regional activity (100 km)

Last 24 hours
1
Last 7 days
5
Last 30 days
16

Approximate energy released

≈ 21 t TNT

8.91e+10 J

Approximated with the Gutenberg–Richter relation (log E = 1.5 M + 4.8); depends on magnitude type. Gutenberg & Richter (1956).

Did you feel this earthquake?

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Community reports

Based on voluntary reports from users; not an instrumental measurement or official intensity. For official information follow AFAD and Kandilli Observatory announcements.

Impact information reported by sources

  • USGS Earthquake Hazards Program Tsunami flag: No Felt reports: 4

These values are automatic products of the respective agency, not an assessment by this platform. For tsunami warnings follow the Kandilli Observatory Regional Earthquake-Tsunami Monitoring Center and AFAD.

Nearby places

No records.

Nearby faults (50 km)

No mapped fault within 50 km.

Last year, within 100 km

18 earthquakes

By magnitude

  • M0 0
  • M1 0
  • M2 9
  • M3 8
  • M4 1
  • M5 0
  • M6 0
  • M7 0
  • M8+ 0

By depth

  • 0–10 km 2
  • 10–20 km 5
  • 20–40 km 5
  • 40–70 km 3
  • 70–150 km 2
  • 150+ km 1

Largest previous earthquakes within 100 km

Largest earthquakes in the platform catalogue and entries from historical catalogues (with citation).

Comparison with past records

…

No earlier earthquakes are recorded in this area.

  • Source:

Where does this earthquake come from?

Source comparison

Sources report different values.
Agency Magnitude Depth Time (UTC) Difference from master Original record
EMSC-CSEM
PUERTO RICO REGION
 3.8 ml 32.7 km 09:43:58.950 Δt 1.51 sn · 0.45 km · ΔM -0.3 Original record
USGS Earthquake Hazards Program Displayed
21 km SE of Esperanza, Puerto Rico
 4.1 md 25.0 km 09:44:00.460 Δt 0 sn · 0 km · ΔM 0 Original record

This value summarises agreement between sources; it is not a measure of scientific accuracy. Euro-Mediterranean Seismological Centre (EMSC-CSEM) — CC BY 4.0 U.S. Geological Survey (USGS) Earthquake Hazards Program — Public domain (U.S. Government)

Revision history

  1. 28.10.2026 14:45:03 · EMSC · update

    depth: 25 → 32.7 latitude: 17.9548 → 17.9507 longitude: -65.3388 → -65.3387 magnitude: 4.1 → 3.8 time: 2026-10-28T09:44:00.460+00:00 → 2026-10-28T09:43:58.950+00:00 magnitude type: md → ml

  2. 28.10.2026 13:43:24 · USGS · update

    depth: 32.78 → 25 latitude: 17.9478 → 17.9548 longitude: -65.3403 → -65.3388 magnitude: 3.8 → 4.1 time: 2026-10-28T09:43:59.075+00:00 → 2026-10-28T09:44:00.460+00:00 magnitude type: ml → md

  3. 28.10.2026 13:43:24 · SISTEM · recompute

    depth: 32.78 → 25 latitude: 17.9478 → 17.9548 longitude: -65.3403 → -65.3388 magnitude: 3.8 → 4.1 time: 2026-10-28T09:43:59.075Z → 2026-10-28 09:44:00.460+00:00 magnitude type: ml → md

  4. 28.10.2026 13:43:22 · EMSC · update

    depth: 32.8 → 25 latitude: 17.9478 → 17.9548 longitude: -65.3403 → -65.3388 magnitude: 3.8 → 4.1 time: 2026-10-28T09:43:59.075+00:00 → 2026-10-28T09:44:00.460+00:00 magnitude type: ml → md

  5. 28.10.2026 13:09:41 · SISTEM · recompute

    source count: 1 → 2 confirming sources: usgs → emsc,usgs

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