M3.9 Earthquake 18 km SE of Naalehu, Hawaii — July 15, 2026
2026-07-15 11:21:58 UTC (1 hour ago) · approx. 1:21 AM UTC-10 local
On July 15, 2026 at 11:21 UTC, a magnitude 3.9 shallow crustal earthquake struck 18 km SE of Naalehu, Hawaii, at a depth of 31.1 km and coordinates 18.9428°, -155.4700°.
Physical scale: An earthquake of magnitude 3.9 releases seismic energy equivalent to roughly 11 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 301 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-155.4700°E
Technical Information
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Common Questions
How strong was the magnitude 3.9 earthquake near Naalehu, Hawaii?
The magnitude 3.9 earthquake that struck 18 km SE of Naalehu, Hawaii on July 15, 2026 at 11:21 UTC had a depth of 31.1 km. For context, this was a minor earthquake typically detected only by instruments.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 3.9 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.9 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: hv75003066). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, July 15, 2026). M3.9 Earthquake 18 km SE of Naalehu, Hawaii — July 15, 2026. Retrieved July 15, 2026 from https://www.earthquaketracker.org/earthquakes/event/hv75003066/