[MIS03-01] Crustal structure of the Nankai subduction zone revealed by two decades of onshore-offshore and ocean-bottom seismometer data
Keywords:Subduction, Nankai, Earthquakes, Crustal structure
Our work seeks to bridge this imaging gap for the Nankai subduction zone by making use of the largest onshore-offshore and ocean-bottom seismometers (OBSs) dataset ever recorded: air gun sources from multiple offshore experiments passively recorded onshore by dense permanent networks of borehole seismometers, augmented by 3-D OBS experiments offshore and carefully selected Earthquake events from existing catalogs onshore. This dataset has accumulated over two-decades and includes over 45+ million source-receiver pairs with coverage of the entire Nankai subduction zone.
In this presentation, I will describe refined 3-D constraints on the geological architecture of the Nankai subduction zone and relationships with along-strike variations in geodetic locking, large earthquake occurrence and the distribution of slow earthquake phenomena at depth.