Momotombo (Nicaragua): Recorded Eruptions and Historical Activity

Momotombo is a stratovolcano located in Nicaragua, standing at an elevation of 1,270 meters within a subduction zone and continental crust setting exceeding 25 kilometers in depth. According to the Smithsonian Global Volcanism Program, the volcano has a confirmed record of 19 eruptions spanning from ancient pre-historic activity to the modern era.

The historical record distinguishes individual eruptive events using various evidence methods, ranging from uncalibrated radiocarbon isotopic dating for ancient periods to direct human observation for historical and modern events. The largest recorded eruption in the available data reached a Volcanic Explosivity Index (VEI) of 4.0.

Chronological Overview of Eruptions

The confirmed eruption record for Momotombo spans multiple centuries, beginning with early activity evaluated through isotopic dating and continuing through centuries of reported observations:

• 26th Century BCE: The earliest recorded eruption in the dataset is dated to 2550 BCE with an estimated start year uncertainty of 300 years, determined via uncalibrated carbon-14 isotopic evidence.
• 8th Century BCE to 11th Century CE: Recorded eruptions occurred sporadically across these early centuries.
• 16th Century CE: Activity included a reported eruption starting in February 1578 with a VEI of 2.0.
• 17th Century CE: A significant eruption occurred from 1605 to 1606, registering a Volcanic Explosivity Index of 4.0.
• 19th Century CE: This century contains the highest concentration of recorded eruptions in the dataset, with 8 confirmed events, including an eruption starting on July 2, 1852, which recorded a VEI of 2.0.
• 20th and 21st Centuries CE: Recorded events continued into the modern era, culminating in a confirmed eruption that began at the summit crater and northwest flank on December 1, 2015, and ended on April 7, 2016, with a VEI of 2.0.

Eruption Distribution by Century

The 19 confirmed eruptions documented by the Smithsonian Global Volcanism Program are distributed across time as follows:

• 26th century BCE: 1 eruption
• 8th century BCE: 1 eruption
• 11th century CE: 1 eruption
• 16th century CE: 2 eruptions
• 17th century CE: 1 eruption
• 18th century CE: 2 eruptions
• 19th century CE: 8 eruptions
• 20th century CE: 2 eruptions
• 21st century CE: 1 eruption

Among these 19 confirmed eruptions, 17 include recorded Volcanic Explosivity Index (VEI) values, up to the maximum observed VEI of 4.0. The latest structured eruption sequence in the official record began on December 1, 2015, and concluded on April 7, 2016.