Data from: 3D shear-wave velocity model of central Makran using ambient-noise adjoint tomography

The Makran subduction zone is unique in its wide onshore thick
accretionary prism, and a volcanic arc not parallel to the E-W trend of
the Makran accretionary prism. To investigate the internal structure of
the accretionary prism, the crustal nature of Jaz Murian Depression, and
the trend of the buried trench we have calculated a 3D shear-wave velocity
model for a region around the border between eastern and western Makran
using ambient-noise adjoint tomography and data from IASBS/CAM Makran
temporary seismic network. In close agreement with previous works, our
velocity model shows that the onshore accretionary prism consists of a
low-velocity zone in the south and a high-velocity zone in the north with
an average thickness of accreted sediments of 22 and 30 km, respectively.
The young age of the surface rocks of the high-velocity part of the prism
suggests the presence of a significant volume of igneous rocks scraped
from the subducting oceanic slab. The velocity model indicates a
continental crust of ~40 km with a thick sedimentary cover of ~20 km for
the eastern part of Jaz Murian Depression. The presence of a NE-SW
trending low-velocity region at a depth interval of 40-60 km subparallel
with the trend of the volcanic arc, intermediate-depth earthquakes, and
geometry of the overriding plate might be related to the trend of the
buried trench. This implies that the observed NE-SW trending volcanic arc
might be related to the geometry of the buried trench and not the eastward
reduction of the subduction angle.