Young Dieng Volcanic Complex, Central Java, Indonesia: volcano stratigraphy and morphostructure analyses approached

Abstract

The Dieng Volcanic Complex, Banjarnegara, Central Java, Indonesia is complex volcanoes that build Dieng Plateau, 2565 m height. The relatively east-west Dieng Complex is stratovolcano type, composes more than 20 small craters and cones that grown in the two or more old stratovolcanoes or Old Dieng Complex, Prau-Rogojembangan. The younger cones or craters build the complex known as Young Dieng Volcanic complex. Volcano stratigraphy analyses through DEM and topography map permits to identify the Old Dieng Complex, crescent moon like, open to SW that form during a caldera collapse. A successive younger volcanic cone grown follow the caldera collapse developed the Young Dieng Volcanic Complex and continuous active today. The regional and residual Bouguer anomaly suggest the Central Java controlled by NW-SE structural lineament and less both of E-W and N-S structural lineament. The NW-SE structural lineament play main role in control Quaternary Volcanic activity such as Ungaran-Telomoyo-Merbabu-Merapi and Dieng Complex-Sundoro-Sumbing volcanic chains. The Dieng Complex present associated with low Bouguer anomaly and circular feature. The residual Bouguer anomaly could explain the Dieng Complex activity possibly controlled by dense NW-SE structural lineament and relatively thin crustal where the magma could reach to the surface.