Iranian Volcano Taftan Experiences Significant Uplift, Prompting Monitoring Calls

A volcano in southeastern Iran, known as Taftan, has experienced an uplift of approximately 3.5 inches (9 centimeters) over a 10-month period. This finding, based on new satellite data, indicates a buildup of pressure near its summit. Taftan has no recorded eruptions in human history.

The uplift, centered near the summit, has not subsided, suggesting sustained internal pressure within the volcano.

Monitoring the Uplift

Scientists utilized Interferometric Synthetic Aperture Radar (InSAR) from Sentinel-1 satellites to track ground motion. This method allows for continuous monitoring, day and night, and can penetrate cloud cover. The study was guided by Pablo J. González from the Institute of Natural Products and Agrobiology (IPNA). Due to Taftan's remote location and lack of ground instruments, space-based radar is essential for its surveillance.

Source of Pressure

Modeling suggests the pressure source is located 1,600 to 2,070 feet (490 to 630 meters) below the surface. This shallow depth points to gases accumulating within a hydrothermal system, where hot water and gas circulate beneath the volcano. Researchers ruled out external factors such as heavy rain and nearby earthquakes. The deeper magma reservoir is situated over 2 miles (3.2 kilometers) down, implying the current uplift is primarily due to shallower gas accumulation rather than new magma. The pattern of uplift initially rose, then stabilized as gases likely found new pathways.

Volcanic Activity Assessment

Taftan is a 12,927-foot (3,940-meter) stratovolcano with active summit fumaroles, which are vents emitting gas, indicating that the system remains active. A lack of eruption records over the past 10,000 years does not equate to an inactive system, as volcanoes can lie dormant for extended periods before becoming active. Scientists monitor gas emissions, heat changes, and ground motion as key indicators of volcanic unrest.

Potential Hazards

The primary short-term hazards include phreatic blasts (steam-driven explosions) and gas bursts, which can affect air quality downwind. The city of Khash, located about 31 miles (50 kilometers) away, could be impacted by sulfur odors.

González stated that the study is a call for regional authorities in Iran to dedicate resources for further monitoring.

Future Monitoring and Preparedness

Scientists propose measuring gas compositions (sulfur dioxide, carbon dioxide, water vapor) at vents and slopes and establishing a network of seismometers and GPS units. Satellite monitoring via InSAR will continue to track ground movement. Authorities are advised to develop evacuation plans, create hazard maps, and provide clear guidance to nearby communities.

Sustained or accelerating uplift, combined with increased gas measurements or seismic activity, would indicate heightened concern. Conversely, ground subsidence would suggest easing pressure.