M4.2 Earthquake 65 km SW of Tambolaka, Indonesia — October 4, 2026
2026-10-04 14:59:44 UTC (3 hours ago) · approx. 10:59 PM UTC+8 local
On October 4, 2026 at 14:59 UTC, a magnitude 4.2 shallow crustal earthquake struck 65 km SW of Tambolaka, Indonesia, at a depth of 25.6 km and coordinates -9.8792°, 118.8554°.
Physical scale: An earthquake of magnitude 4.2 releases seismic energy equivalent to roughly 30 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 476 m — a useful intuition for the size of the slip patch on the fault.
This earthquake is part of an ongoing aftershock sequence following the magnitude 5.9 mainshock that occurred 19 hours ago 39 km WSW of Tambolaka, Indonesia. Since the mainshock, the USGS has recorded 0 aftershocks in this area. Aftershock activity is expected to continue for days to weeks as stresses on surrounding faults redistribute.
Earthquake Details
118.8554°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.2 earthquake near Tambolaka, Indonesia?
The magnitude 4.2 earthquake that struck 65 km SW of Tambolaka, Indonesia on October 4, 2026 at 14:59 UTC had a depth of 25.6 km. For context, this was a light earthquake commonly felt near the epicenter.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.2 earthquakes can continue for several days and gradually diminish over time.
Is this the same earthquake as the M5.9 one earlier?
No. This magnitude 4.2 earthquake is an aftershock of the larger magnitude 5.9 mainshock that occurred earlier 39 km WSW of Tambolaka, Indonesia. Aftershocks are smaller earthquakes triggered by stress changes from the mainshock.
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Understanding This Data
Magnitude 4.2 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000tzjg). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, October 4, 2026). M4.2 Earthquake 65 km SW of Tambolaka, Indonesia — October 4, 2026. Retrieved October 4, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000tzjg/