Journal
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
Volume 22, Issue 8, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2021GC009638
Keywords
Hikurangi; earthquake; tsunami; biomarker; frictional heating; seismic hazard
Categories
Funding
- U.S. Science Support Program/International Discovery Program [1450528]
- Brinson Foundation
Ask authors/readers for more resources
The study investigated whether the Papaku fault can host seismic slip at shallow depths, finding four zones of localized high temperature near the top of the fault interpreted to be zones of localized seismic slip. Thermal modeling shows that the most likely maximum displacement on the shallow Papaku fault during each event was 14-17 m.
The Hikurangi subduction zone is capable of producing moderate to large earthquakes as well as regularly repeating slow slip events. However, it is unclear what structures host these different slip styles along the margin. Here we address whether splay faults can host seismic slip at shallow (<1 km) depth by investigating the Papaku fault, sampled during International Ocean Discovery Program Expedition 375. We use biomarker thermal maturity to search for evidence of frictional heating within turbiditic sediments of the Papaku fault. Four zones of localized high temperature are found near the top of the fault zone, which are interpreted to be zones of localized seismic slip. Thermal modeling shows that the most likely maximum displacement on the shallow Papaku fault during each event was 14-17 m. Our results demonstrate that the Papaku fault, and potentially other splay faults along the margin, host coseismic slip and have the potential to produce large tsunami (e.g., runup heights of >1 m as observed in the 1947 Poverty and Tolaga Bay earthquakes.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available