Surficial Signatures of Lineaments and Temperatures on Dieng Volcanic Complex (DVC)

Abstract

Dieng Volcanic Complex (DVC), also known as Dieng plateau, is located in the Province of Central Java, Indonesia. The geothermal exploration in this area has been conducted to study its potency, focussing on the subsurface setting through geophysical investigations. This study aimed to integrate the subsurface expression and surficial signature, particularly to observe the spatial correlation between the subsurface structures and surficial lineaments. The magnetic-based structures and ALOS PALSAR-based lineaments were coupled with the ASTER-based surface kinetic temperature (AST_08), as the proxy indicator of thermally active area. Synthesizing the integrated information from the surficial signatures of lineament density and thermal anomalies, with the subsurface reference on magnetic structures, reflected a result ambiguity for its correlation. The clusters of thermal anomalies were coupled with the zones of lower lineament density and higher magnetic anomalies. While conceptually, lower magnetism generally associates with the hydrothermal zone that relates to higher lineament density, promoting structural channels for up-flow transfer. Several reasons to the biased result might be affected by; (a) the widely contrast of input scale, that may carry lower accuracy from down-scaling the remote sensing dataset to meet the scale of magnetic reference; (b) TIR-based temperature may bear topographical-related issue in estimating temperature on steep or rugged terrains; and (c) the complexity in subsurface expressions