TephraLog

TephraLog is a compact volcano reference toolkit that combines reported volcanic event information with practical calculation and estimation tools. Use TephraLog to review volcanic events, estimate eruption parameters, compare magma characteristics, and calculate approximate tephra loads from one clear interface. VOLCANIC EVENT DATA: Browse reported volcanic events using publicly available data provided through NASA EONET. View available details such as: • Event name • Reported date • Location • Coordinates Data availability and update frequency depend on the original data source. VEI ESTIMATOR: Select an ejecta-volume range to estimate the corresponding Volcanic Explosivity Index. The tool displays: • Estimated VEI level • General eruption classification • Associated plume-height range LAVA VISCOSITY ESTIMATOR: Choose a magma composition and temperature to calculate an approximate viscosity value. Compare the general properties of: • Basaltic magma • Andesitic magma • Rhyolitic magma TEPHRA LOAD CALCULATOR: Enter an ash-layer thickness and choose between dry or wet ash to estimate the approximate load per square metre. This tool provides a simplified numerical reference for comparing different tephra conditions. IMPORTANT NOTICE: TephraLog is a general reference and calculation tool. All results are simplified estimates and may not reflect actual volcanic, structural, environmental, or local conditions. The app is not an emergency warning service and should not be used as the sole basis for evacuation, travel, construction, roof-safety, or other safety-critical decisions. Always follow information and instructions issued by local authorities, emergency services, volcano observatories, and qualified professionals. Volcanic event data source: NASA Earth Observatory Natural Event Tracker — EONET. TephraLog is an independent application and is not affiliated with, operated by, authorized by, or endorsed by NASA or any government agency.