The Comparative of Morphological and Gravity Anomaly Lineaments in West Progo Mountains, Indonesia The Comparative of Morphological and Gravity Anomaly Lineaments in West Progo Mountains, Indonesia

- Winarti, Emi Sukiyah, Ildrem Syafri, Andi Agus Nur

Abstract


In Yogyakarta Special Region, the West Progo Dome comprises the Nanggulan Formation and Old-Andesite Formation as the oldest formations. The Nanggulan Formation is composed of sedimentary rock with a density of 2.5 g/cm3, while the Old-Andesite Formation is composed of volcanic rock with a density of 2.7 g/cm3. Dome morphology is formed by vertical endogenous energy that radiates SE-NW, NE-SW, and E-W. This study aims to describe the correlation between the hill lineaments and gravity anomaly lineaments in the Nanggulan Formation and Old-Andesian Formation. Identification of the hill lineament uses Shuttle Radar Topography Mission (SRTM), while the gravity anomaly lineament uses gravity anomaly map. The standard used in the gravity survey concerning the American Society for Testing and Materials Standard (ASTM). The measurement system utilizes a looping distance of 200-350 meters. The lineaments of the hill and gravity anomaly show the same direction SE-NW. Both lineaments are calculated by fractal dimension (D) utilize the box-counting method. The result of overlaying the two lineaments' fractal dimension produces the same value and the different value. The same fractal dimension value (D=0.81-1.20) indicates whether the hill lineament and gravity anomaly lineament are correlated, while the different fractal dimension values indicate that the two lineaments are not correlated. The fractal dimension value is different due to small intrusions and faults.


Keywords


Lineament; dome; gravity anomaly; fractal.

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DOI: http://dx.doi.org/10.18517/ijaseit.11.1.13076

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