Imaging the Vp and Vp/Vs Structures Beneath the Central Taupō Volcanic Zone, New Zealand, Using Adjoint-State Joint P- and S-wave Traveltime Tomography

1. Model file 'TVZ_vp_ratio_3D': 120 140 45 - the total number of grid nodes in three (longitude, latitude and depth) directions. 173.9117 -39.8423 30.00 7.8398 1.7399 - longitude, latitude, depth, vp, ratio 2. Traveltime files: (1) 'P_traveltime_data' and 'S_traveltime_data' have the same data format. 1 1987 3 22 20 30 37.460 176.18886 -38.47471 5.00000 2.20 4 404 1 HITZ 175.76644 -38.70689 458.00000 P 44.88 8.50400 2 WHH 176.49526 -38.88269 921.00000 P 52.59 9.56400 3 HUTZ 176.09440 -38.63193 300.00000 P 19.31 4.54400 4 TUTZ 175.99140 -38.70991 614.00000 P 31.28 5.88400 num, year, month, day, hour, minute, second, longitude, latitude, depth, magnitude, number of stations, event_ID station_num, station_name, longitude, latitude, elevation, phase, distance, arrival_time