Magma vesiculation and infrasonic activity at Stromboli open conduit volcano

摘要: Abstract Explosive activity at Stromboli is explained in terms of dynamics large gas bubbles that ascend the magma conduit and burst free surface generating acoustic pressure propagates as infrasonic signals atmosphere. The rate amplitude directly linked to overpressure bursting thus reflects which column degasses under non-equilibrium conditions. We investigate link between explosive degassing vesiculation by comparing with bubble size distributions (BSDs) scoria clasts collected during several days Stromboli. BSDs show a characteristic power law distribution, reflect concentration mainly controlled combined process nucleation coalescence. cumulative distribution follows two laws, indicating clear separation frequent, but weak, small (puffing) more energetic explosions slugs. exponents laws derived for puffing strongly correlated (0.96) changes time when high, number also elevated. This correlation suggests both are driven same dynamics. In addition, very well (0.92 0.87 explosions) variations BSD clasts, providing evidence strong interplay explosivity. Our analysis indicates variable regimes recorded correlate event energy activity. propose monitoring infrasound on active volcanoes may be an alternative way look open systems.