What question did this study set out to answer?

Determine the fault geometry and subsurface rupture mechanisms governing major thrust earthquakes in an active collision zone.

January 1, 1998Geology

Mid-crustal detachment and ramp faulting in the Markham Valley, Papua New Guinea

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Determine the fault geometry and subsurface rupture mechanisms governing major thrust earthquakes in an active collision zone.
Modeled seismic waveforms from three large thrust earthquakes (Mw 6.3 to 6.9) occurring in October 1993.
Conducted Global Positioning System (GPS) geodetic surveys to measure coseismic ground displacement across the active valley.
Waveform analyses revealed 15° north-dipping thrust faulting at approximately 20 km depth that transitions into a steep, shallow ramp fault.
GPS measurements captured up to 20 cm of coseismic slip, demonstrating that active faulting extended to within a few hundred meters of the surface.
Waveform records confirmed that both the deep mid-crustal detachment and the shallow ramp fault slipped during at least one earthquake event.

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Implication

Geophysical investigation reveals mid-crustal detachment and ramp faulting during major earthquakes, indicating that deep detachment structures generate significant seismic hazards.

Cite This Study

Stevens et al. (1998) studied this question.

synapsesocial.com/papers/6a8f33976d03388d1118dae6 https://doi.org/10.1130/0091-7613(1998)026<0847:mcdarf>2.3.co;2

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Implication

Geophysical investigation reveals mid-crustal detachment and ramp faulting during major earthquakes, indicating that deep detachment structures generate significant seismic hazards.

Mid-crustal detachment and ramp faulting in the Markham Valley, Papua New Guinea

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Discussion

Implication

Cite This Study

Mid-crustal detachment and ramp faulting in the Markham Valley, Papua New Guinea

Key Points

Discussion

Implication

Cite This Study

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