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Figure 1

From: Hidden mechanical weaknesses within lava domes provided by buried high-porosity hydrothermal alteration zones

Figure 1

Merapi volcano. (A) Overview map of Java Island with Central Java marked by black box. (B) View of Merapi volcano from the South. White box marks enlarged area in subsequent image. (C) Merapi summit dome close up photograph showing fumarole activity and ongoing hydrothermal degassing including yellowish coloured alteration zones (1 July 2012). Inset in (C) shows a thermal infrared camera image (handheld camera type: FLIR P 660) that highlights apparent temperature highs located at the southern part of the lava dome (t1 and t2) prior to the 2012–2014 explosions. Mapviews were created using ArcMap (v10.5, https://desktop.arcgis.com/de/arcmap/), FLIR image created using the FLIR ThermaCAM Researcher Pro (vs2.10) software.

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