The Indonesian Volcanology and Geological Disaster Mitigation Agency (PVMBG) has announced the expansion of the safety zone around the summit of Salak Mountain in Central Java to three kilometers instead of two, due to an increase in volcanic activity observed recently. This announcement was made in a special report numbered 631.Lap/GL.03/BGL/2026, signed by the acting head of the agency, Lana Saria, on April 4, 2026.
Mohammad Rusdi, head of the volcano monitoring center at Salak Mountain, indicated that volcanic activity has been on the rise since the end of March 2026, with repeated earthquakes and significant thermal changes detected in the area. Drones have been employed to closely monitor the situation, revealing a substantial increase in temperatures around the crater.
Details of the Event
According to reports, white gas emissions have been observed reaching heights of approximately 300 meters above the crater since April 3, 2026, indicating volcanic gas activity. Thermal analyses showed that the temperature of the crater increased from about 247.4 degrees Celsius in September 2024 to 463 degrees Celsius on April 3, 2026, suggesting heightened volcanic activity.
Between March 16 and April 3, 2026, hundreds of earthquakes were recorded, reflecting increased gas pressure within the mountain. The agency has warned that the current activity could lead to volcanic eruptions, resulting in volcanic ash, mud rains, and high-concentration gas emissions in the vicinity of the crater.
Background & Context
Salak Mountain is one of the highest mountains in Central Java and has historically experienced intermittent volcanic activity. On October 19, 2023, the volcanic activity status of the mountain was raised from Level I (Normal) to Level II (Alert) due to increased volcanic activity. This change in status underscores the importance of continuous monitoring and accurate assessment of volcanic activity to ensure the safety of local populations.
Several villages are located around Salak Mountain, making it essential to take precautionary measures to protect residents. Inhabitants in the surrounding areas, including Banyumas, Purbolinggo, Pemalang, Tegal, and Brebes, have been advised to remain calm and not succumb to unverified information.
Impact & Consequences
The increase in volcanic activity at Salak Mountain serves as a warning to local residents and authorities. In the event of a volcanic eruption, residents may face multiple hazards, including volcanic ash that could affect air and water quality. Additionally, mud rains could lead to flooding in sloped areas, increasing risks to life and property.
These conditions require a swift response from local authorities, including providing accurate information to residents, activating emergency plans, and offering necessary support to those affected. Tourists and adventurers should also avoid approaching the restricted area to ensure their safety.
Regional Significance
Although Salak Mountain is located in Indonesia, volcanic events have global implications. Volcanic eruptions can lead to changes in global climate, affecting agriculture and economies in distant regions. Additionally, sharing information about volcanic activity can help Arab countries enhance their preparedness for natural disasters.
In conclusion, the volcanic activity at Salak Mountain serves as a reminder of the importance of continuous monitoring and readiness to face natural disasters. Local communities and authorities must be on alert to respond to any emergencies that may arise from these activities.