George Helffrich

George Helffrich is a professor at the Earth-Life Science Institute of Tokyo Institute of Technology, specializing in geoscience research on seismology and the deep Earth interior. Formerly Professor of Seismology at the University of Bristol School of Earth Sciences, Helffrich investigates Earth's mantle and core composition, core-mantle boundary structure, seismic discontinuities, mantle heterogeneity, subduction zone structure, phase transitions, and related geophysical phenomena. His work extends to planetary science, including core formation and mantle discontinuities on Mars and Mercury.

With over 170 publications cited more than 7,000 times and an h-index of 47, Helffrich's key contributions include "Phase transition Clapeyron slopes and transition zone seismic discontinuity topography" (1994), "The Earth's mantle" (2001), "Topography of the transition zone seismic discontinuities" (2000), "Crystallization of silicon dioxide and compositional evolution of the Earth’s core" (2017), "Outer-core compositional stratification from observed core wave speed profiles" (2010), and the textbook "The Seismic Analysis Code: A Primer and User's Guide" (2013). He edited "Core Mantle Co-Evolution: An Interdisciplinary Approach" (2023) and received the American Geophysical Union Fellowship in 2017. Recent papers address Mars midmantle discontinuities (2025), FeH melting curves (2022), and core liquid thermodynamics (2020), influencing models of deep Earth and planetary evolution.

Professional Email: george@elsi.jp