West Java, an Earthquake Hotspot, Surrounded by 29 Active Faults: The List

Jakarta, CNBC Indonesia — According to the Meteorology, Climatology and Geophysics Agency (BMKG), a series of 146 earthquakes struck Bandung regency, West Java, between 11 August and 21 September 2026. At least 14 of the seismic events were felt by residents in Cisewu, Talegong, Pangalengan and surrounding areas.

The earthquakes ranged in magnitude from M1.0 to M3.4 and produced shaking at intensity II–III on the Modified Mercalli Intensity (MMI) scale. At these levels, tremors are clearly felt indoors, like a passing lorry; light hanging objects may sway, and several people may feel the shaking.

“The earthquakes were shallow. Their epicentres formed along a southwest–northeast direction, around 5–8 kilometres west of the Kendang segment of the Garsela Fault and north of the Kencana segment,” BMKG said in a post on its official Instagram account on Sunday (11 October 2026).

BMKG said a network of seismic sensors is deployed throughout West Java to monitor seismic activity.

“The earthquake sources are movements along active faults on land that extend across West Java,” the agency said.

BMKG added that earthquakes do not always occur directly above faults that have already been mapped.

“BMKG’s 35 seismic sensors are spread across West Java and can record micro-earthquakes, or low-magnitude earthquakes. These records help BMKG identify patterns of seismic activity, locate earthquake sources and study fault activity,” it wrote on @infobmkg.

Active faults across West Java

BMKG’s post listed the active faults and segments in the province:

• Cimandiri Fault (Citatah segment)

• Cimandiri Fault (Cisokan segment)

• Cimandiri Fault (Cimandiri segment)

• Cimandiri Fault (Nyalindung Cibeber segment)

• Lembang Fault

• Cileunyi–Tanjungsari Fault

• Cisalengka Fault

• Cianjur 1 Fault

• Cianjur 2 Fault

• Cipammingis Fault

• Garsela Fault (Kendang segment)

• Garsela Fault (Kencana segment)

• Tampormas Fault

• Karangmanggu Fault

• Ciremai Fault

• Java Back-arc Thrust (Depok segment)

• Java Back-arc Thrust (Rarata segment)

• Java Back-arc Thrust (Salak segment)

• Java Back-arc Thrust (Citarum Front segment)

• Java Back-arc Thrust (Citarum segment)

• Java Back-arc Thrust (Carius segment)

• Java Back-arc Thrust (Klapanunggal segment)

• Java Back-arc Thrust (Cirata segment)

• Java Back-arc Thrust (Tangkuban Perahu segment)

• Java Back-arc Thrust (Cipunegara segment)

• Java Back-arc Thrust (Tampomas segment)

• Java Back-arc Thrust (Baribis segment)

• Java Back-arc Thrust (Ciremai segment)

• Java Back-arc Thrust (Cisanggarung segment)

“BMKG will continue to monitor seismic activity and provide the public with the latest information,” the agency said.

“Stay calm and do not believe rumours. Make sure earthquake information comes only from BMKG’s official channels,” it added.