What question did this study set out to answer?

To clarify the seismic structure of the Opak fault and assess its implications for seismic hazards in Yogyakarta.

Detailed Seismic Structure Beneath the Opak Fault Zone, Yogyakarta, Indonesia: Evidence for an Interconnected Fault System and Implications for Seismic Hazard

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Study reveals interconnected fault system influences seismic hazards in Yogyakarta, suggesting improved assessments.

To clarify the seismic structure of the Opak fault and assess its implications for seismic hazards in Yogyakarta.
Utilized seismic tomography and focal mechanism analysis.
Employed receiver functions and seismicity data.
Deployed a mini regional network and collaborated with earthquake monitoring stations.
Analyzed 3079 earthquakes to refine fault interaction resolution.
Identified interconnected Opak, Ngalang, and Oyo faults at a depth of around 12 km.
Observed significant changes in P-wave and S-wave velocities at 9 km depth.
Mapped crustal thickness variations from 27 km to 36 km in different regions.
Highlighted risks of earthquakes due to potential rupture of parallel faults.

Yuliatmoko et al. (2026) studied this question.

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