The Earth's mantle von Wood, Bernard J, Helffrich, George R

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Hydrous upwelling across the mantle transition zone beneath the Afar Triple Junction von Thompson, DA, Hammond, JOS, Kendall, JM, Stuart, GW, Helffrich, GR, Keir, D, Ayele, A, Goitom, B

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How good are routinely determined focal mechanisms? Empirical statistics based on a comparison of Harvard, USGS and ERI moment tensors von Helffrich, George R.

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CAN‐HK: An a Priori Crustal Model for the Canadian Shield von Thompson, DA, Kendall, JM, Helffrich, GR, Bastow, ID, Wookey, J, Snyder, DB

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Topography of the "410" and "660" km seismic discontinuities in the Izu-Bonin Subduction Zone von Collier, Jonathan D., Helffrich, George R.

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Seismic discontinuities and subduction zones von Collier, Jonathan D., Helffrich, George R., Wood, Bernard J.

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410 km discontinuity sharpness and the form of the olivine α-β phase diagram: resolution of apparent seismic contradictions von Helffrich, George R., Wood, Bernard J.

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The thermal influence of the subducting slab beneath South America from 410 and 660 km discontinuity observations von Collier, J. D., Helffrich, G. R.

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Calculation of Elastic Properties from Thermodynamic Equation of State Principles von Bina, C R, Helffrich, G R

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The stability of sodalite in the system NaAlSiO4-NaCl von Sharp, Z.D, Helffrich, G.R, Bohlen, S.R, Essene, E.J

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