M4.2 Earthquake 47 km SW of Tambolaka, Indonesia — February 27, 2026
2026-02-27 21:31:26 UTC (2026-02-27) · approx. 5:31 AM UTC+8 local
On February 27, 2026 at 21:31 UTC, a magnitude 4.2 shallow crustal earthquake struck 47 km SW of Tambolaka, Indonesia, at a depth of 59.7 km and coordinates -9.7799°, 118.9897°.
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 5.0 mainshock that occurred 18 days ago 24 km SE of Tambolaka, Indonesia. Since the mainshock, the USGS has recorded 1 aftershocks in this area. Aftershock activity is expected to continue for days to weeks as stresses on surrounding faults redistribute.
Earthquake Details
118.9897°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 47 km SW of Tambolaka, Indonesia on February 27, 2026 at 21:31 UTC had a depth of 59.7 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 M5.0 one earlier?
No. This magnitude 4.2 earthquake is an aftershock of the larger magnitude 5.0 mainshock that occurred earlier 24 km SE of Tambolaka, Indonesia. Aftershocks are smaller earthquakes triggered by stress changes from the mainshock.
What should I do after an earthquake?
If you were in the affected area: check yourself and others for injuries, inspect your home for damage, and be prepared for aftershocks. For detailed guidance, see our earthquake safety guide and emergency planning resources.
Actions
Understanding This Data
Magnitude 4.2 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000sfvb). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, February 27, 2026). M4.2 Earthquake 47 km SW of Tambolaka, Indonesia — February 27, 2026. Retrieved May 15, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000sfvb/