Please use this identifier to cite or link to this item:
http://hdl.handle.net/2122/16310
Authors: | Passarelli, Luigi* Cesca, Simone* Nooshiri, Nima* Jónsson, Sigurjón* |
Title: | Earthquake Fingerprint of an Incipient Subduction of a Bathymetric High | Journal: | Geophysical Research Letters | Series/Report no.: | 14/49 (2022) | Publisher: | Wiley-AGU | Issue Date: | 28-Jul-2022 | DOI: | 10.1029/2022GL100326 | Keywords: | ridge subduction vanuatu subduction seamount subduction tsunami |
Subject Classification: | solid earth | Abstract: | The resistance of bathymetric highs to subduction results in large-scale morphological distortions of the outer-rise, trench, and fore-arc regions. Once subducted, bathymetric highs induce frictional segmentation along the plate interface that may result in increase or decrease of the plate coupling. However, the mechanics of the collision is inferred mostly from geophysical and geological surveys since earthquakes rarely illuminate finer details of the subduction of seafloor relief. A year-long and energetic seismic sequence at the Loyalty Ridge (LR)-Vanuatu Trench allowed us to characterize how strain is released along the collision zone. Earthquakes revealed complex fracturing in the outer-rise and fore-arc regions and segmentation of the interface with both limited magnitude events and aftershock productivity. The complex earthquake activity associated to the collision and subduction of the LR appears to support a frictionally segmented interface where Mw ≥ 8 megathrust earthquakes are unlikely to nucleate. |
Appears in Collections: | Article published / in press |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
Loyalty_paper_Final_NoRef.pdf | main | 4.41 MB | Adobe PDF | View/Open |
Loyalty_paper_Supplement_Final.pdf | supplementary material | 1.29 MB | Adobe PDF | View/Open |
Page view(s)
16
checked on Apr 20, 2024
Download(s)
36
checked on Apr 20, 2024