TY JOUR TI Improving the system of numerical simulation of volcanic ash propagation using the PUFF model KW Volcano monitoring KW forecasting KW computational models KW algorithms KW software tools and services KW remote sensing JO Russian Journal of Earth Sciences AU Malkovsky, S.. AU Sorokin, A.. AU Korolev, S.. PY 2017 IS 17 PB Geophysical Center of the Russian Academy of Sciences