The Long-Period seismicity before and during the volcanic crises: examples from two case studies

the LP events picked at SX15 before and during the 2002-2003 eruption. No relevant changes are detected crossing the eruption onset, while two long-lasting LP swarms start about two months before the eruption. LP events during the swarms display higher energy and occurrence rate, quasi-monochromatic waveforms and lower variation coefficient, that means an almost constant interevent time, whereas the standard LP activity is ruled by a Poisson process. The Long-Period seismicity before and during the volcanic crises: examples from two case studies M. Palo1, S. De Martino2, M. Falanga2, P. Cusano3, M. West4