Chikurachki (Russia): Recorded Eruptions and Historical Activity

Chikurachki is a stratovolcano located in Russia, standing at an elevation of 1,781 meters within a subduction zone and continental crust tectonic setting. According to the Smithsonian Global Volcanism Program's official record, the volcano has a confirmed history of 28 eruptions, with activity spanning thousands of years from prehistoric isotope-dated events up to observations in the 21st century.

Overview of Recorded Eruptions

The historical and prehistoric record for Chikurachki includes 28 confirmed eruptions. Evidence methods for these events vary depending on their antiquity, ranging from calibrated radiocarbon isotopic dating and tephrochronology correlations for ancient periods to direct reported observations for modern events. The largest recorded eruptions reach a Volcanic Explosivity Index (VEI) of 4.0, while other events are smaller scale.

Chronological Distribution of Activity

Volcanic activity at Chikurachki is distributed across multiple centuries and millennia, combining prehistoric epochs with modern historical observations. The earliest recorded eruption in the dataset began around 9360 BCE with an 80-year uncertainty margin. Subsequent activity appears intermittently across various millennia and centuries, with concentrations in the 20th and 21st centuries CE.

The distribution of confirmed eruptions across recorded centuries and millennia includes:

• 94th century BCE: 1 eruption
• 85th century BCE: 1 eruption
• 76th century BCE: 1 eruption
• 64th century BCE: 1 eruption
• 20th century BCE: 1 eruption
• 15th century BCE: 1 eruption
• 17th century CE: 1 eruption
• 19th century CE: 1 eruption
• 20th century CE: 7 eruptions
• 21st century CE: 12 eruptions

Selected Historical Eruption Examples

The available record documents shifts in eruption styles and documentation methods over time:

• 9360 BCE (VEI 2): An early prehistoric eruption documented via calibrated 14C isotopic evidence, carrying a start year uncertainty of 80 years.
• 1690 CE (VEI 4): An explosive event at the Tatarinov activity area identified through tephrochronology correlation, with a start year uncertainty of 10 years.
• 1973 CE (VEI 2): A documented eruption lasting from August 10, 1973, to September 28, 1973, recorded through reported observations.
• 1986 CE (VEI 4): A larger explosive phase lasting from November 18, 1986, to December 7, 1986.
• 2023 CE (VEI 2): A recent confirmed eruption sequence beginning on January 28, 2023, and concluding on February 8, 2023.

The profile's last known eruption year is 2023, representing the latest completed event captured in this structured dataset.