摘要
Energy cone is a unique but characteristic slope that describes the extent of deposits left around a volcano by various fiowage phenomena, usually regarded as the boundary of pyroclastic and the source region of lahar. The energy cone value is determined as 0.07 by the energy-Hne model com- bined with the parameters of plume height and gradient, and the energy cone spread extent is defined by the numerical simulation method LAHARZ to simulate with this value based on the 1 ： 50 000 digi-tal elevation model of Tianchi （天池） Volcano, and the source region profiles in the north and south slope can prove the correctness of this threshold. This energy cone threshold and extent can be used as the reference of pyroelastic flow and lahar simulation.
Energy cone is a unique but characteristic slope that describes the extent of deposits left around a volcano by various fiowage phenomena, usually regarded as the boundary of pyroclastic and the source region of lahar. The energy cone value is determined as 0.07 by the energy-Hne model com- bined with the parameters of plume height and gradient, and the energy cone spread extent is defined by the numerical simulation method LAHARZ to simulate with this value based on the 1 ： 50 000 digi-tal elevation model of Tianchi （天池） Volcano, and the source region profiles in the north and south slope can prove the correctness of this threshold. This energy cone threshold and extent can be used as the reference of pyroelastic flow and lahar simulation.
基金
supported by the Natural Science Foundation of China (No. 40972209)
the Special Projects of the Fundamental Scientific Research of the Institute of Geology, China Earthquake Administration (No. IGCEA1103)
