Journal
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
Volume 127, Issue 8, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2022JB024227
Keywords
coseismic and postseismic deformation; seismic and aseismic slip; thick-skinned orogeny; flat-ramp structure; fault heterogeneity
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Funding
- National Natural Science Foundation of China [42174023]
- Innovation Foundation for Postgraduate of Central South University [2020zzts181]
- Hunan Provincial Innovation Foundation for Postgraduate [CX20200344]
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This study investigates the surface deformation after the 2018 Papua New Guinea earthquake and deduces fault slip models using remote sensing data. The results reveal that the earthquake reactivated fault structures and most of the slip occurred between 5 and 25 km. Additionally, three separated postseismic slip zones were identified.
Knowledge of the fault kinematics underlying the Papuan Fold Belt is important for better understanding the evolution of the orogen, but the active and long-term tectonics of the region remain widely debated. The 2018 M-w 7.5 Papua New Guinea earthquake provides an unprecedented opportunity to probe the active fault structure deep in the Papuan Fold Belt. Here, we use Interferometric Synthetic Aperture Radar data from four ALOS-2 acquisitions to study coseismic and postseismic ground deformation and invert for fault slip models. The results show that the oblique reverse earthquake reactivated a flat-ramp structure and ruptured through most of the crust with the majority of coseismic slip confined between 5 and 25 km. Additionally, we found three separated postseismic slip zones with variable spatial complementarity between coseismic and postseismic slip, dip-slip/strike-slip ratio, and seismic/aseismic budget at three separated postseismic slip zones. Our results demonstrate that thick-skinned tectonics dominate the current state of Papua New Guinea frontal orogen evolution.
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