Details in the tornillo onset and the intermediate wavepacket, and their relationships to the characteristics of the tornillo coda, are important factors which will enable us to derive a more thorough picture of what physical process in the volcano actually produces the tornillos. In particular, the tornillos associated with the recent activity give interesting clues: why are their frequencies lower and what governs the timing of their occurrence in the eruption sequence?
Berkeley Seismological Laboratory
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