A Travel?Time Path Calibration Strategy for Back?Projection of Large Earthquakes and Its Application and Validation Through the Segmented Super?Shear Rupture Imaging of the 2002 Mw 7.9 Denali Earthquake

We investigate the impact of source-side 3D velocity structure on teleseismic travel-time in back projection (BP) analysis large earthquakes. use data events recorded by Hi-Net array to reveal how errors vary with source location. In a area few hundred km, where error varies dominantly linearly, we propose new interpolation scheme using earthquakes located around mainshock rupture calibrate error, and validate it relocating inland M > 5.0 central Japan. then apply image 2002 Denali earthquake. The calibrated BP result shows that most high-frequency radiators are <15 km away from surface trace. reveals started Susitna Glacier Fault speed ?1.4 km/s, propagated onto accelerated super-shear approaching crustal P-wave at approximately 30 km. location transition highly consistent inferred timing amplitude ratio trailing Rayleigh pulses observed near fault PS-10 station. Subsequently, stagnated for ?15 s before penetrating through largest asperity, re-accelerated ?5.2 km/s continued last 60 part Totschunda Fault. This application great potential calibration strategy refine imaging other mega-earthquakes.