Eruptive Cycle and Bubble Trap of Strokkur Geyser, Iceland

The eruption frequency of geysers can be studied easily on the surface. However, details internal structure including possible water and gas filled chambers feeding eruptions driving mechanisms often remain elusive. We used a multidisciplinary network seismometers, video cameras, pressure sensors one tiltmeter to study eruptive cycle, structure, cycle Strokkur geyser in June 2018. An at always consists four phases: (1) Eruption, (2) post-eruptive conduit refilling, (3) filling bubble trap, (4) regular collapse shallow depth conduit. For typical single 19 ± 4 collapses occur Phase 3 8 2 mean spacing 1.52 0.29 24.5 5.9 s, respectively. These release latent heat fluid trap (Phase 3) later 4). latter eventually reaches thermodynamic conditions for an eruption. Single sextuple have similar spacings between are likely fed from same 23.7 4.4 m depth, 13–23 west duration recharging phase linearly increases due larger water, loss system. Our tremor data provides documented evidence beneath pool geyser.