Ruapehu (New Zealand): Recorded Eruptions and Historical Activity

Ruapehu is a stratovolcano located in New Zealand at an elevation of 2,797 meters, situated within a subduction zone and continental crust tectonic setting (greater than 25 kilometers deep). According to official records from the Smithsonian Global Volcanism Program, the volcano has a confirmed total of 64 eruptions spanning from deep prehistory up to the 21st century.

The historical and prehistoric record for Ruapehu documents activity across multiple millennia, utilizing various evidence methods ranging from calibrated and uncalibrated radiocarbon dating to direct historical observations.

Chronology of Recorded Eruptions

The earliest recorded eruption in the official dataset dates back to 9850 BCE (with a start year modifier indicated as uncertain). Prehistoric activity is distributed across several centuries, with isolated confirmed eruptions logged in the 99th, 97th, 79th, 76th, and 56th centuries BCE, as well as the 13th century CE.

The largest recorded eruptions in the dataset reached a Volcanic Explosivity Index (VEI) of 4.0. Among these is an uncalibrated radiocarbon-dated eruption on the upper north flank (Pinnacle Ridge) that started around 7840 BCE.

Activity grew more frequently documented in more recent centuries. The 19th century CE accounts for 3 confirmed eruptions, while the 20th century CE contains the majority of the recorded events with 53 confirmed eruptions. Representative events from the 20th century include a VEI 2 eruption that spanned from May 9 to May 13, 1936, and another VEI 2 eruption occurring from June 22 to June 23, 1969, both documented through reported observations.

Recent Activity

Activity in the 21st century CE includes 2 confirmed eruptions. The latest recorded eruption in the official database began and ended on September 25, 2007, with a VEI of 1.0, determined through reported observations. The profile's last-known eruption year is 2007.