Mechanical and topographic factors influencing lava dome growth and collapse

Lava dome collapse hazards are intimately linked with their morphology and internal structure. We present new lava emplacement models that use calibrated rock strengths allow material behaviour to be simulated for three distinct units: (1) a ductile, fluid core; (2) solid upper carapace; (3) disaggregated talus slopes. first show relative proportions of depend on strength, piles can act as an unstable substrate cause collapse, even in domes high strength. then simulate sequential emplacement, demonstrating renewed growth destabilise otherwise stable pre-existing domes. This destabilisation is exacerbated if the has been weakened following e.g., through processes hydrothermal alteration. Finally, we within crater how weakening walls engender sector collapse. A better understanding important component hazard mitigation at dome-forming volcanoes worldwide.