Compared to the highly oblique convergence across the plate boundary in Sumatra, near Java, it is close to orthogonal. However, there is still a small component of left-lateral strike-slip that is accommodated within the over-riding Sunda Plate. The Cimandiri Fault is one of the structures thought to be responsible.[6] Field investigations, combined with morphometric analysis show that the Cimandiri Fault zone is a relatively broad zone of faulting and folding, with six segments identified. Older parts of the fault zone show evidence of dominant left-lateral strike-slip, while younger parts show mainly oblique slip, with a mixture of reverse faulting and left-lateral strike-slip.[7]
Geology
According to the National Agency for Disaster Countermeasure (BNPB), the earthquake occurred in proximity to the Garsela and Lembang faults. None of these faults triggered the earthquake, instead, it ruptured along a previously unknown fault. In 2022, an earthquake in Cianjur occurred on another unmapped fault that resulted in over 600 fatalities.[8]
Impact
Two people died and 159 others were injured.[9] Both fatalities were children; one succumbed to injuries sustained after being struck by falling debris while another died from a seizure. The earthquake also displaced 710 people who were moved to shelters.[10] At least 784 homes collapsed and over 5,379 others and 226 buildings were damaged in Bandung Regency.[11][12] In Garut, 20 people were injured, six homes collapsed, and 2,036 structures were damaged.[13][14][15][16] A house was destroyed and two others were damaged in West Bandung Regency; one school was damaged in Cimahi; another home collapsed in Purwakarta; and one home was damaged in Bogor.[15]
