A Persistent Seismic Sequence in West Java
Bandung Regency and its surrounding areas have been experiencing a prolonged earthquake swarm since mid-August. Indonesia's Meteorology, Climatology, and Geophysics Agency (BMKG) recorded 118 separate tremors between August 11 and the morning of September 17, 2026, with magnitudes ranging from 1.0 to 3.4 on the Richter scale.
Of those 118 events, 13 were strong enough to be felt by residents. Communities in Pangalengan, Talegong, Cisewu, and nearby areas reported sensing the tremors, which registered at intensity II to III on the Modified Mercalli Intensity (MMI) scale. At that level, shaking is typically described as similar to the vibration of a heavy truck passing close by, noticeable indoors but generally not alarming.
Where the Tremors Are Coming From
BMKG Earthquake and Tsunami Director Wijayanto, speaking in Bandung, explained that the epicenters form a southwest-to-northeast trend located roughly 5 to 8 kilometers west of the South Garut Fault, known locally as Garsela, in its Kendang Segment, and north of the Garsela Fault in the Kencana Segment.
Critically, Wijayanto noted that the tremors are not occurring within the mapped boundaries of the Garsela Fault Zone or the Cicalengka Fault. Instead, they are originating in what he described as an unmapped area. That distinction matters: it means the seismic source driving this swarm has not yet been formally identified or characterized, and BMKG has called for further in-depth study to determine what fault structure is responsible.
All of the recorded earthquakes have been shallow, and BMKG classifies them as tectonically related to local fault activity in the region.
What BMKG Is Doing
The agency currently operates 35 seismic sensors across West Java, a network capable of detecting micro-earthquakes at small magnitudes with reasonable precision. BMKG says it will continue monitoring the sequence and distributing updated information to stakeholders and the public. Officials have urged residents to stay calm and to rely only on verified information rather than unconfirmed reports circulating on social media.
Why It Matters for Hosts
Independent accommodation operators in the Bandung area, particularly those running guesthouses or homestays in highland communities such as Pangalengan, should treat this swarm as a prompt to review their basic preparedness. Practically, that means confirming that guests receive a clear, calm briefing on what to do if they feel shaking, checking that evacuation routes are unobstructed, and keeping an eye on official BMKG updates rather than informal channels. Guests who feel a low-intensity tremor during their stay are far more likely to remain comfortable if the host has already normalized the information and provided straightforward guidance. Proactive communication, rather than silence, is the most effective tool available right now.
The figures and official statements in this post were first reported by Tempo.co, citing BMKG Earthquake and Tsunami Director Wijayanto.
First reported by en.tempo.co.