Fig. 2: Acoustic and magnetic signatures of the oceanic basement and sedimentary structures in west Eurasia Basin.

Expanded area in block plot is the magnetic anomaly map (CAMP compilation; ref. ¹³) with main oceanic crust structures as in Fig. 1. Geoseismic composite sections with seismic stratigraphic units and ties (2.6 Ma, 6–7/10 Ma, and 48 Ma Azolla markers) are shown as profiles i and ii, while selected portions of seismic reflections profiles are labeled as 1 to 3 and 4 (in Fig. 4). The magnetic anomaly and interpreted chrons (C2A to C24) based on CAMP grid (solid line) and NRL tracklines (stippled line) (refs. ^12,13) are shown on top of Profiles i and 1(see also S2). Late Cenozoic magmatic additions are indicated with pink ellipses, including the region of observed VEHAI reflections. Seismic profile 2 from ref. ¹⁶ and profile 3 from ref. ¹⁷. See “Methods” section for details on the workflow to construct the geoseismic composite profiles. TAB Top Acoustic Basement. Other abbreviations as in Fig. 1. Overview of the region and profile locations are shown in the inset map.