BackgroundLasem was active in middle upper Pleistocene (IAVCEI). Deposits have been dated to 1.6 - 1.1 Ma, and it appears to be the oldest and least potassic Quaternary volcano in the back-arc region of central Java (Leterrier et al., 1990). Lasem's products mostly consist of pyroclastic flow deposits, small lava flows, and dome extrusions. Composition is dominantly characterized by potassic calc-alkaline andesites, but there are also some basaltic andesites and dacites (Leterrier et al., 1990).
Source: Smithsonian / GVP volcano information
See also: Sentinel hub | Landsat 8 | NASA FIRMS