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Event Brief

Magnitude 5.9 earthquake strikes Indonesia's Sumbawa region

A magnitude 5.9 earthquake struck the Sumbawa region of Indonesia on Sunday, October 4, 2026, the German Research Center for Geosciences said. GFZ reported that the quake occurred at a depth of 10 km.
WHO: German Research Center for Geosciences (GFZ)
WHAT: A magnitude 5.9 earthquake struck the Sumbawa region.
WHEN: Oct 4, 2026
WHERE: Sumbawa region, Indonesia
WHY: Cause not yet established.

How this brief is built: The BriefBrief uses multi-source information fusion to correlate reporting across sources, identify related developments, and continuously update a structured WHO, WHAT, WHEN, WHERE and WHY event picture. Pattern arcs, source analysis, and velocity indicators provide deeper analysis in our MI Console.

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