Analisis GIS Terhadap Gerakan Tanah di Girimulyo, Kulonprogo, D.I. Yogyakarta, dan Kajian Faktor – Faktor Pengontrolnya

Yogi Saktyan Respati¹, Asnanto Multa Putranto¹, Azim Suwardi¹, Irien Akinina Fatkhiandari¹, dan Salahuddin Husein²

1) Student at Geological Engineering Department Gadjah Mada University, corresponding email: yogi_onmail@yahoo.co.id, asnantomp@gmail.com, azim_suwardi@yahoo.co.id, qnz_qnina@yahoo.com

2) Lecturer at Geological Engineering Department, Gadjah Mada University

Abstract

There were several landslides had occurred at Girimulyo District, Kulonprogo Regency, Yogyakarta Special Province. These suggest that this area exhibits high potential of mass movement. This research is intended to map and analyze the mass movement potentail by using two methods, i.e. qualitative and quantitative, respectively. Direct observation is on site study for internal factors (e.g. lithologies and geologic structure) and external factors (e.g slope, vegetation, and landuses). Quantitative method utilizes Geographic Information System (GIS) spatial analysis on weighted parameters, i.e. slope, lithologies, geologic structures, and landuses. The research area is mainly composed of weathered lithologies of andesit breccia and breccia tuff covering steep slopes, whilst the rainfall rate reaches up to 2205 mm/y. Both factors are presumed to be the main trigger of mass movement. Result of this research is landslide susceptibility zonation which consist ot four levels which can be used as a basic information for hazard mitigation and regional planning. There were two types of mass movement exist at this area, fall movement were predominant in andesitic intrusion, whereas flow movement mainly took place in andesitic breccias, coralline limestones, and tuffaceous siltstones. This study suggests that more attention and awareness should be paid for areas with high and very high susceptibility levels such as Tanggulangin, Talunombo, and Giripurwo, particularly during high rainy sesason

(this is abstract of my second research and paper which is submitted at 2010 International Geosciences Conference and Exsposition)

Kajian Zona Kerentanan Gerakan Tanah dengan Pendekatan Analisis GIS
pada Daerah Girimulyo, Kulonprogo, D.I. Yogyakarta

Asnanto Multa Putranto (1) , Yogi Saktyan Respati (1) , dan Salahuddin Husein (2)
1) Student at Geological Engineering Department Gadjah Mada University, corresponding email: asnantomp@gmail.com, yogi_onmail@yahoo.co.id
2) Lecturer at Geological Engineering Department Gadjah Mada University

Abstract

Landslide susceptibility zoning is often using as a basic information for hazard mitigation and regional planning. This method was applied onto Girimulyo District, Kulonprogo Regency, Yogyakarta Special Province. This study area is composed of weathered lithologies of andesite and andesitic breccias covering steep slopes, which had considerable probability for mass movement to occur. This study utilizes quantitatively spatial analysis by using Geographic Information System (GIS) on weighted parameters, i.e. slopes, lithologies, geologic structures, and landuses. Verified by existing landslides, it is expected that outcomes from this research might be used to mitigate future events. There were two types of mass movement occurred in the study area, fall movement were predominant in andesitic intrusion, whereas flow movement mainly took place in andesitic breccias, coralline limestones, and tuffaceous siltstones. Most of the events were located along a structurally weak zone on NW-SE trend. This study suggests that more attention should be paid for areas with high and very high susceptibility levels, such as Tanggulangin, Talunombo, and Giripurwo, particularly during high rainy season.

Keywords: Landslide, GIS, Girimulyo Yogyakarta.

(this is abstract of my first research and paper which is submited at Annual Convention and Exhibition of Indonesian Association of Geologists)

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