What 17,073 Flores aftershocks mean for regional risk
BMKG said the Flores sequence had produced 17,073 aftershocks by 5 a.m. on September 21, after the August 15 magnitude 7.7 earthquake. The largest measured 6.2.
By Mukmin John
Editor: Mursyid Sonsang
· Event date: · 1 min read
Flores — BMKG recorded 17,073 aftershocks in the Flores earthquake sequence by 5 a.m. on September 21, 2026. The sequence followed the magnitude 7.7 Flores earthquake on August 15, 2026.
The Meteorology, Climatology and Geophysics Agency (BMKG) said the largest recorded aftershock had magnitude 6.2. The monitoring figure covers activity recorded through September 21, 2026, at 5 a.m. local time, which was 5 a.m.
Why the count matters to Flores readers
The aftershock total indicates that seismic activity continued after the main earthquake. BMKG’s figure provides the official count for the sequence as of the stated monitoring time.
Okezone reported that BMKG attributed the 17,073 events to the sequence that began with the magnitude 7.7 earthquake on August 15, 2026. The same report identified magnitude 6.2 as the largest aftershock recorded in the sequence.
The BMKG report described the September 21 event as part of the aftershock sequence from the August 15 earthquake. It stated that monitoring had recorded 17073 aftershock activities by 5 a.m. on September 21, with the largest measuring magnitude 6.2.
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