Spatio-temporal changes in degassing behavior at Stromboli volcano derived from two co-exposed SO2 camera stations

Improving volcanic gas monitoring techniques is central to better understanding open-vent, persistently degassing volcanoes. SO 2 cameras are increasingly used in studies, but observations commonly limited one single camera alone viewing the plume from a specific direction. Here, we report on high frequency (0.5 Hz) systematic measurements of flux at Stromboli, covering 1-year long observation period (June 2017-June 2018), obtained two permanent using same automated algorithm, imaging different directions. Our aim experimentally validate robustness automatic for volcano and demonstrate advantage co-exposed stations capturing dynamics open-vent The time-series derived exhibit good match, demonstrating method. high-temporal resolution records resolve individual Strombolian explosions as transient, repetitive bursts produced by sudden release over pressurized pockets scoriae. Calculations show that explosive activity accounts ?10% total emission budget (dominated passive degassing) during mild regular activity. We temporal variations go tandem with changes VLP seismicity, implicating some commonality source processes controlling exploited spatial discriminate distinct regions crater area, minimize biases due station position respect target plume. find fluxes southwest-central (SWCC) northeast (NEC) areas oscillate coherently those NEC more sensitive intensity. interpret this preferential gas/magma channeling into structurally weaker north-eastern portion terrace response increasing supply rate buoyant, bubble-rich magma shallow plumbing system.