How a small noise generates large-amplitude oscillations of volcanic plug and provides high seismicity Dmitri V. Alexandrov, Irina A. Bashkirtseva and Lev B. Ryashko Eur. Phys. J. B, 88 4 (2015) 106 Published online: 20 April 2015 DOI: 10.1140/epjb/e2015-60130-6