What data sources does the Volcano Activity Monitor use?

This tool combines real-time data from USGS (United States Geological Survey) volcano monitoring systems and the Smithsonian Institution's Global Volcanism Program database, providing comprehensive coverage of active volcanoes worldwide.

What do the volcano alert levels mean?

Alert levels indicate volcanic activity: NORMAL/GREEN means background activity, ADVISORY/YELLOW indicates elevated unrest above known background, WATCH/ORANGE signifies heightened/escalating unrest with increased eruption potential, and WARNING/RED indicates imminent or ongoing hazardous eruption.

How often is the volcano data updated?

USGS monitored volcano data is fetched in real-time when you load the page. The Smithsonian Global Volcanism Program database is updated regularly with new eruption information and volcano discoveries.

Can I use this tool for flight safety decisions?

This tool is for informational purposes only. For official aviation safety decisions, please consult Volcanic Ash Advisory Centers (VAACs) and official airline/government guidance. The aviation color codes shown are from USGS official alerts.

Does this tool cover volcanoes outside the United States?

Yes! While USGS provides detailed real-time alerts for US and territory volcanoes, the Smithsonian Global Volcanism Program data covers all known Holocene volcanoes worldwide - over 1,400 volcanoes across the globe.

Free Online Volcano Activity Monitor (No Signup)

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Elevated Alert

Warning

Watch

Advisory

Normal

Volcanoes by Observatory

Alert Level Legend

Warning / Red Hazardous eruption imminent or ongoing

Watch / Orange Heightened unrest, increased eruption potential

Advisory / Yellow Elevated unrest above known background

Normal / Green Background activity, non-eruptive unrest

How to Use

View the interactive map showing all monitored volcanoes
Use filter buttons to show specific alert levels
Click any volcano marker for detailed information
Search for specific volcanoes by name
Check the Overview tab for statistics

Data Sources

This tool combines data from official scientific sources:

USGS Volcano Hazards Program - Real-time US volcano monitoring and alert levels
Smithsonian Global Volcanism Program - Comprehensive database of Holocene volcanoes worldwide

Aviation Color Codes

Aviation color codes (Green, Yellow, Orange, Red) are used by pilots and airlines to assess volcanic ash hazards. These codes correspond to the ground-based alert levels but are specifically designed for aviation safety.

Disclaimer

This tool is for informational purposes only. For official volcanic activity information and safety guidance, please consult USGS, local volcano observatories, and official government sources. Do not make safety decisions based solely on this application.