3:45 PM - 4:00 PM
[SSS03-07] Crustal scale controls on megathrust slip behaviour - Insights from margin-wide high-resolution tomography of Nankai Trough and the Hikurangi subduction zone
★Invited Papers
Crustal scale architecture and the properties of the overthrusting and subducting plates have been shown to play key roles in modulating the rupture area, slip-distribution and magnitude of earthquakes, and their proximity to densely populated coastal regions or deep-sea trenches. However, constraining the crustal scale architecture of subduction zones at high-resolution over scales comparable to the rupture area of the largest earthquakes (∼50,000–250,000 km2) is a significant challenge.
In this presentation, I will describe two experiments in which our team have integrated over two-decades of onshore-offshore, ocean bottom seismometer and marine multi-channel seismic data to undertake high-resolution regional tomography of Nankai Trough and the Hikurangi subduction zone. I will describe the common relationships we observe between crustal scale architecture and megathrust slip behaviour and the relevance of relationships observed during large earthquakes in Nankai Trough and the Japan Trench for the characterization of likely future rupture scenarios along the Hikurangi margin.
In this presentation, I will describe two experiments in which our team have integrated over two-decades of onshore-offshore, ocean bottom seismometer and marine multi-channel seismic data to undertake high-resolution regional tomography of Nankai Trough and the Hikurangi subduction zone. I will describe the common relationships we observe between crustal scale architecture and megathrust slip behaviour and the relevance of relationships observed during large earthquakes in Nankai Trough and the Japan Trench for the characterization of likely future rupture scenarios along the Hikurangi margin.