Neutrinos can be used to study the interiors of various objects that are difficult to fully probe by
classical means. In the case of the Earth, neutrinos provide complementary information to seismic
waves because of the imprint of matter effects on their oscillations. This alternative approach
may bring new insights on open questions regarding the composition, structure and dynamics of
the deep Earth, for example concerning the nature and origin of the large-scale inhomogeneities
observed in the lower mantle and known as large low-shear velocity provinces (LLSVPs). In
order to be able to explore the potential of present- and future-generation atmospheric neutrino
detectors for probing asymmetric models of the Earth’s mantle, we extended the capabilities of
the OscProb programming library to handle calculating oscillation probabilities for a neutrino
trajectory defined by both the zenith and azimuthal angles through an Earth model binned in 3
dimensions: depth, latitude, and longitude. An example using a simplistic model of an LLSVP is
provided to demonstrate how this new version of OscProb can be used.