Figure 4
Compilation of our new magnetic data and all available regional shipborne magnetic data south of Sri Lanka (for line coverage see Supplementary Fig. S1). Map: Geosoft Oasis Montaj (https://www.seequent.com/products-solutions/geosoft-oasis-montaj/). Grey lines indicate the locations of newly acquired magnetic data between 5° N and 3° S (Fig. 1b), blue lines are selected bathymetric contours. The line spacing of the new shipborne data is approximately 20 km. Yellow circles show the positions of seismic stations along profile 20170300 (Fig. 2c) both on the seafloor and onshore Sri Lanka. See methods section for details of processing and gridding the magnetic data. Abbreviations: COB-continent-ocean boundary (onset of oceanic crust); Q1, Q2 and C34y—interpreted geomagnetic reversal and fluctuation intensity isochrons, age model according to10,11,14.
