BackgroundPesagi volcano, a collapsed caldera located SE of Ranau Lake, was mapped as a morphologically youthful volcano of likely late Pleistocene age (Sieh and Natawidjaja, 2000; Widarto et al., 2016). However, Wahib (1998) suggests that Pesagi did erupt in the Holocene and that it is in part responsible for young volcanic breccias, tuffs, and andesites in the region. Despite its relative youth, the slopes are quite dissected in spots and approach angles as steep as 70 degrees near the summit (Wahib, 1998). These inherently unstable slopes collapsed in the wake of the 1993 Liwa earthquake, leading to destructive landslides.
Source: Smithsonian / GVP volcano information
See also: Sentinel hub | Landsat 8