Oleh :  Ahmad Faiz MUBAROK, Agung SETIANTO1) dan Tim PT. Asi Pudjiastuti Geosurvey 2)
1)Departmen Teknik Geologi, Fakultas Teknik, Universitas Gadjah Mada

LiDAR telah banyak dimanfaatkan untuk pemetaan skala detail, yang dapat dioptimalisasikan untuk perencanaan tata letak kota, pembangunan sarana
infrastruktur, penentuan zonasi wilayah banjir dan zonasi wilayah bencana dan juga pemetaan geologi. Namun, aplikasi LiDAR untuk geologi masih jarang
dilakukan di Indonesia, terutama yang berkitan dengan data intesity. LiDAR dapat memberikan data yang sangat detail karena resolusi spasial yang tinggi
sehingga dapat digunakan dalam interpretasi geologi. Oleh karena itu, dalam penelitian ini akan dikaji mengenai aplikasi LiDAR dalam penentuan batuan
dan kondisi geologi di daerah penelitian.

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By: Agung SETIANTO1) and SOETAAT2)
1)Department of Geological Engineering, Faculty of Engineering, Gadjah Mada University, Indonesia
2)Department of Geodetic and Geomatics Engineering, Faculty of Engineering, Gadjah Mada University, Indonesia

In order to reduce the urgent disaster due to Mt. Bawakaraeng Caldera wall collapse, the present condition of caldera wall in detail is needed to be mapping. This caldera wall is
an inaccessible and unstable area, because the wall face is very steep, about 800 meters in height and more than 1,000 meters of the width, and located at the top of Mt.
Bawakaraeng. The caldera wall was collapsed about ten years ago and millions cubic materials, mainly sand and rock, slide down to Jeneberang River as sedimentation.

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Indra Arifianto ⁽¹⁾, Kartika Palupi Savitri ⁽¹⁾, Muhammad Rachmat Fadhil Priana ⁽¹⁾ and Agung Setianto ⁽¹⁾

⁽¹⁾Department of Geological Enginnering, Universitas Gadjah Mada.

ABSTRACT

The research area is located in Camba-Camba Village, Batang, Jeneponto, South Sulawesi Province, Indonesia. This area is included in the the Indonesian Government ‘development acceleration program for underdeveloped regions’. This research area shows a flow ridge volcanic morphology consisting of volcanic breccia, tuffaceous sand, and laharic clay deposit from Lompobatang Volcanic Formation. The geological condition leads to a scarcity of groundwater in the area, which makes looking for a great groundwater source is challenging. On the other hand, such a groundwater source is needed to fulfil the water demands of plantation and rice field irrigation, particularly in the dry season. The geoelectric or resistivity method was used in this study to determine the location and depth of groundwater aquifers. The resistivity method used was the vertical electrical sounding (VES) “Schlumberger” method which aims to identify the variation of subsurface rocks resistivity value against depth. Through an inversion resistivity modeling, the true resistivity value in this area ranges from 0.87 to 6117 Ωm. There are five groups of subsurface rocks that could be identified based on these values, namely claystone aquiclude, shaly sand aquitard, tuffaceous sandstone aquifer, volcanic breccia aquitard-aquifuge, and lava aquifuge. Each group, respectively, showed a resistivity value of 0.87-10.63 Ωm, 12.74-22.91 Ωm, 18.83-58.25 Ωm, 62.46-159.5 Ωm, and 414-6117 Ωm. Based on the results of the correlation and modelling of these five groups, a drilling site location was set near the JPT 02 resistivity measurement point, where the model showed an aquifer at the depth of 50 meter. The presence of this aquifer was confirmed by the drilling.

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by : Agung SETIANTO+, Tetsuro ESAKI*, Yasuhiro MITANI**,
Ibrahim DJAMALUDDIN*** and Hiro IKEMI****
(Received May 8, 2009)
Abstract
The occurrence of the surface movement is the main focus of the
study regarding to the gold & copper underground block caving mining
in Papua, Indonesia. The underground mining has brought some
environmental problems on the terrain surface such as the lowering of
the elevation followed by growing of the waste pile as the result from
the failure of the rock slope.
In this study, the surface movements due to the underground mining
were analyzed by using the aerial photogrammetry method and the
Geographic Information System (GIS) technology. The detected surface
subsidence ranging from 1.5 to 2 meter and the development of the
sedimentation area has been identified in which the maximum deposit
thickness is about 2 meter. In addition, the correlations between
extraction thicknesses over the overburden versus ground movement
have been studied in order to find out the influence of some geological
conditions in the development of the surface changing.
The surface movement induced by underground mining causes some
serious environmental impact not only above the extraction zones but
also the surrounding areas. Some environmental impacts due to the
surface movement are reviewed and discussed in this paper in order to
describe the current situation of the underground mining in Papua,
Indonesia

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Oleh : Agung Setianto dan Desvery Budi Yandra

Maksud dilakukannya penelitian ini adalah melakukan upaya penanggulangan bencana gerakan tanah dengan memetakan zona-zona kerentanan gerakan tanah berdasarkan SNI 13-7124-2005 tentang penyusunan peta kerentanan gerakan tanah di Kecamatan Karangkobar, Kabupaten Banjarnegara, Provinsi Jawa tengah.

Sedangkan, Tujuannya yaitu :

• Mengetahui faktor pengontrol dominan yang memicu terjadinya gerakan tanah di daerah penelitian
• Mengetahui dan memahami persebaran tingkat kerentanan gerakan tanah pada lokasi penelitian.

Lokasi administrasi penelitian berada di Kecamatan Karangkobar, Kabupaten Banjarnegara, Provinsi Jawa Tengah. Skala peta zona gerakan tanah adalah 1:25.000 untuk Kecamatan/Kota di Pulau Jawa menggunakan 3 klasifikasi zona kerentanan gerakan tanah, yaitu zona kerentanan gerakan tanah tinggi, sedang, dan rendah. Penelitian ini menggunakan analisis GIS dalam pemetaan zona kerentanan gerakan tanah dan melakukan penyusunan peta zona kerentanan gerakan tanah dengan metode tidak langsung berdasarkan SNI 13-7124-2005.

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Oleh : Yuli Nurjanah dan Agung Setianto

Maksud dari penelitian ini yaitu untuk mengetahui zona-zona kerawanan gerakan massa di daerah penelitian dari hasil pemetaan geologi, sedangkan Tujuannya  berupa membuat peta kerawanan gerakan massa dengan menggunakan metode frequency Ratio dan melakukan validasi peta kerawanan gerakan massa guna untuk mengetahui tingkat keakuratan peta kerawanan gerakan massa dengan metode Frequency Ratio.

Penelitian ini terbatas pada pemetaan kerawanan gerakan massa dengan pendekatan metode frequency ratio yang diolah dengan menggunakan Sistem Informasi Geografis (SIG) dan data penginderaan jauh. Dalam pembuatan peta kerawanan gerakan massa terdapat beberapa faktor penyebab terjadinya gerakan massa yaitu faktor geomorfologi, geologi, tanah, geohidrologi, tata guna lahan, infiltrasi air ke dalam lereng, getaran dan aaktivitas manusia (Karnawati, 2005). Peta kerawanan gerakan massa divalidasi dengan titik kejadian gerakan massa yang dihasilkan dari hasil pemetaan terbaru.

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I Made IM Brunner, Ph.D

Department of Environmental Engineering

Universitas Bakrie, Jakarta, Indonesia

Jl. H.R. Rasuna Said Kav.C-22. Jakarta 12920

Email: made.brunner@bakrie.ac.id

Dr. Agung Setianto

Department of Geological Engineering

Faculty of engineering, Universitas Gadjah Mada, Yogyakarta

Email: agung.setianto@gmail.com

Abstract

Merapi, the most active volcano in Indonesia, sits on the northern part of Yogyakarta province where about 1.5 million residents live. In 2006 short after eruption, Merapi area was hit by a 5.9 magnitude earthquake that destroyed the Yogyakarta’s natural barrier, known as Geger Boyo.  The pyroclastic flow threat from Merapi becomes more imminent ever since. The Merapi eruption in 2006 and 2010 also brought up social drama when a local key person with several of his followers rejected the government’s evacuation mandatory. Those occasions could happen because the government who rely more on technological equipment failed to build effective communication with the local community. The government with an obligation to save people live have a tendency to give direct orders that need to be obeyed. On the other hand, local community has their own wisdom in dealing with the event, which could be more influential for them.

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oleh Agung Setianto dan Thema Arrisaldi

Maksud dari penelitian ini adalah untuk membuat dan memetakan kerawanan fisik longsor Di Kabupaten Banjarnegara yang mengacu pada Peraturan Menteri Pekerjaan Umum No. 22/PRT/M/2007 mengenai Pedoman Penataan Ruang Kawasan Rawan Bencana Longsor dengan modifikasi pada parameter kelerengan, tata air lereng, vegetasi, serta kondisi tanah.
– Membuat peta kerawanan fisik sesuai dengan pembobotan aspek fisik Peraturan Menteri Pekerjaan Umum No. 22/PRT/M/2007, mengenai Pedoman Penataan Ruang Kawasan Rawan Bencana Longsor di Kecamatan Karangkobar, Kabupaten Banjarnegara dengan skala 1 : 25.000.
– Menganalisis tingkat kerawanan fisik terjadinya tanah longsor di Kecamatan Karangkobar, Kabupten Banjarnegara dengan pembuatan peta kerawanan fisik longsor yang di tampalkan dengan titik longsor.
– Lokasi penelitian di Kecamatan Karangkobar
– Pembuatan Peta Kerawanan Fisik Berdasarkan Peraturan Menteri Pekerjaan Umum No.22/PRT/M/2007 mengenai Pedoman Penataan Ruang kawasan Rawan Bencana Longsor, pada aspek fisik dengan Modifikasi Klasifikasi Pada Kelerengan, Tata Air Lereng, Vegetasi, Kegempaan.
– Kondisi tanah diamati dari pengamatan lapangan.
-Menggunakan Sofware GIS.

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