M5.9 Earthquake 247 km NNE of Colonia, Micronesia — July 30, 2026
2026-07-30 17:55:59 UTC (2 hours ago) · approx. 2:55 AM UTC+9 local
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On July 30, 2026 at 17:55 UTC, a magnitude 5.9 shallow crustal earthquake struck 247 km NNE of Colonia, Micronesia, at a depth of 34.5 km and coordinates 11.5807°, 138.9989°. The USGS PAGER system issued a green alert level for this event, indicating no significant casualties or damage expected. This earthquake was detected by 114 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 536, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 5.9 releases seismic energy equivalent to roughly 11 kilotons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 7.1 km — a useful intuition for the size of the slip patch on the fault.
ShakeMap — predicted shaking intensity
Modeled ground-motion intensity contoured on the Modified Mercalli scale (MMI). Computed by the USGS from the moment-tensor solution and regional ground-motion prediction equations.
Source: U.S. Geological Survey ShakeMap. View interactive ShakeMap on USGS
Earthquake Details
138.9989°E
Technical Information
Common Questions
How strong was the magnitude 5.9 earthquake near Colonia, Micronesia?
The magnitude 5.9 earthquake that struck 247 km NNE of Colonia, Micronesia on July 30, 2026 at 17:55 UTC had a depth of 34.5 km. For context, this was a moderate earthquake that could be widely felt.
Where did the earthquake occur?
The earthquake epicenter was located at 11.5807°, 138.9989°, which is 247 km NNE of Colonia, Micronesia.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 5.9 earthquakes can continue for days to weeks and gradually diminish over time.
Actions
Authoritative source: USGS event page (event ID: us6000th1h). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, July 30, 2026). M5.9 Earthquake 247 km NNE of Colonia, Micronesia — July 30, 2026. Retrieved July 30, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000th1h/