G.Guntur dimonitor oleh Direktorat Vulkanologi (DV) secara terus menerus sejak Pos Pengamatan Gunungapi (Pos PGA) Guntur didirikan tahun 1985 di Desa Sirnajaya Kecamatan Tarogong Kabupaten Garut, Jabar.
Morphologically from south to north, there are three mountain groups, those are Tengger, Jambangan, and Semeru, in East Java, Indonesia. This direction coincides with the subduction direction of Australian plate beneath Java Island from south to north. Among them, two volcanes are active, those are Bromo Volcano at Tengger mountain and Semeru Volcano at Semeru Mountain.