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It was a watershed event in volcanology in a lot of ways, it was when geologists after the eruption worldwide started recognizing these giant debris avalanches, these giant landslides that are now recognized as a major hazard at volcanoes all around the world. Drones, remote instruments like theUSGSspider, creepmeters, strainmeters andtiltmeters help scientists better monitor volcanoes in the hopes history doesn't repeat itself.