Mount Semeru, Indonesia’s tallest volcano on Java Island, recently erupted multiple times, emitting ash plumes up to 1,100 metres, prompting safety alerts and evacuation warnings.

About Mount Semeru

• Located in East Java, Indonesia.
• Height: 3,676 metres above sea level.
• Lies in the Pacific Ring of Fire, a highly active tectonic zone.
  • Ring of Fire: A zone around the Pacific Ocean with intense volcanic and seismic activity due to plate boundaries.

Key Features of Mount Semeru

• • It is a stratovolcano, characterised by steep slopes and explosive eruptions.
    • Stratovolcano: A volcano built from layers of lava, ash, and debris, known for explosive eruptions.
  • One of the most active volcanoes in Indonesia.
  • Regular eruptions include: Ash plumes, pyroclastic flows (hot ash clouds) and lahars.

• Lahar: A mixture of volcanic ash, debris, and water flowing down slopes like mud.

Recent Eruption Highlights

• Multiple eruptions recorded in a single day.
• The ash column reached up to 1,100 metres above the summit.
• Authorities imposed:
  • 5 km exclusion zone around the crater
  • Up to 13 km restriction along river channels
• Risk of lahars and pyroclastic flows extending up to 17 km.

Monitoring & Disaster Management

• Monitored by Centre for Volcanology and Geological Hazard Mitigation (PVMBG), Indonesia.
• Current alert level: Level III (high alert).
• Measures include:
  • Evacuation advisories
  • Continuous seismic monitoring
  • Public safety guidelines

Exam Hook (Prelims MCQ)

With reference to Mount Semeru, consider the following statements:

1. It is located in East Java, Indonesia.
2. It is part of the Pacific Ring of Fire.
3. It is a shield volcano.

Which of the above are correct?
(a) 1 and 2 only
(b) 2 and 3 only
(c) 1 only
(d) 1, 2 and 3

One-Line Wrap

Mount Semeru exemplifies active volcanism in the Pacific Ring of Fire, highlighting the link between plate tectonics and natural disasters.

Source