Gaua is a stratovolcano located in Vanuatu, standing at an elevation of 729.0 meters within a subduction zone setting characterized by intermediate crust (15-25 km depth). According to the Smithsonian Global Volcanism Program's official records, the volcano has a confirmed total of 18 eruptions. Historical documentation for Gaua's activity spans from the 20th century CE into the 21st century CE, with the earliest recorded eruption starting on July 16, 1962, and the latest confirmed activity concluding on May 3, 2022.
Eruption Chronology and Century Breakdown
The historical eruption record for Gaua is concentrated entirely within the 20th and 21st centuries CE. Official reporting documents 14 confirmed eruptions during the 20th century CE and 4 confirmed eruptions during the 21st century CE. Eruptive activity at the volcano has primarily been observed and reported at active areas such as Mt. Garat (also referenced in records as Mt. Garet), including events on its upper southeast flank.
The recorded activity levels reflect varying scales of explosive magnitude measured by the Volcanic Explosivity Index (VEI). Across the 18 observation records with VEI data, the largest recorded VEI is 3.0. Representative events illustrate the range of documented activity:
- July 16, 1962: An eruption at Mt. Garat with a recorded VEI of 2.0 (reported via observation).
- September 27, 1965 to September 30, 1965: An eruption at Mt. Garat reaching a recorded VEI of 3.0, representing the maximum recorded explosive index for the volcano.
- July 16, 1967: A recorded VEI 2.0 eruption at Mt. Garat.
- October 9, 1973 to January 21, 1974: An eruption originating from the upper southeast flank of Mt. Garat with a recorded VEI of 2.0.
- May 3, 2022: A shorter-duration eruption at Mt. Garet with a recorded VEI of 1.0.
Understanding the Record
The Smithsonian Global Volcanism Program tracks these events through reported observations. While 18 confirmed eruptions are documented in the database, the historical record begins in 1962 CE, meaning earlier undocumented or unconfirmed historical activities are not part of this verified count. Each recorded event represents specific observed eruptive episodes rather than a continuous state of activity, with individual records distinguishing start and end dates where available.
Image credits
- NASA image by Jeff Schmaltz — Wikimedia Commons source — Public domain
Sources and further context
Official datasets support the event-specific facts.