Figure 3. The Deles tilt station is located on the South-Est flank of Merapi (3 km from summit), on a compact and massive rock identified as a 5,000 years old pyroxene andesitic lava flow. The thickness reaches 200 m at some places and a few meters of young pyroclastic deposits cap it, constituting a thermal isolator, as compared with the massive rock below. (a) Scheme of the horizontal pendulum Compact Blum made from welded silica. (b) Sensor location (horizontal view) : 5 tiltmeters, 1 thermometer and 1 rainmeter. (c) Vertical section of site 3 tilt installation.

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