Claim Missing Document
Check
Articles

Found 6 Documents
Search
Journal : Forum Geografi

Geospatial Assessment of Coseismic Landslides in Baturagung Area Saputra, Aditya; Sartohadi, Junun; Hadmoko, Danang Sri; Gomez, Christopher
Forum Geografi Vol 29, No 2 (2015): Forum Geografi
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Java, the most densely populated island in Indonesia, is located on top of the most seismically active areas in Southeast Asia: the Sunda Megathrust. This area is frequently hit by strong earthquake. More than 3,300 M>5earthquakesoccurred between 1973-2014. The wide range of mountainous areas and high intensity of rainfall, make several part of the island one of the most exposed regions for coseismic landslides such as Baturagung area, the Southeast mountainous area of Yogyakarta Province. An integrated method between RS and GIS was used to conduct the vulnerability assessment due to the lack of the site specific slope instability analysis and coseismic landslides data. The seismic zonation of Baturagung area was obtained based on the analysis of Kanai attenuation. The geologic information was extracted using remote sensing interpretation based on the 1:100,000 geologic map of Yogyakarta and geomorphologic map of Baturagung area as well. The coseismic landslide hazard assessment has been estimated using scoring analysis in the GIS platform proposed by Mora and Vahrson (1993) with several modification. The accomplished coseismic landslide hazard map shows medium hazard coverage in the eastern areas, in the upper slope of Baturagung area, which consists of Semilir Formation. The result provides a distinct description of coseismic landslides hazard distribution in Batuaragung area. However, it should only be the preliminary assessment of the site specific investigation especially on valuable area or asset. 
Photogrammetry-based Texture Analysis of a Volcaniclastic Outcrop-peel: Low-cost Alternative to TLS and Automation Potentialities using Haar Wavelet and Spatial-Analysis Algorithms Gomez, Christopher; Kataoka, Kyoko; Saputra, Aditya; Wassmer, Patrick; Urabe, Atsushi; Morgenroth, Justin; Kato, Akira
Forum Geografi Vol 31, No 1 (2017): July 2017
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v31i1.3977

Abstract

Numerous progress has been made in the field of applied photogrammetry in the last decade, including the usage of close-range photogrammetry as a mean of conservation and record of outcrops. In the present contribution, we use the SfM-MVS method combined with a wavelet decomposition analysis of the surface, in order to relate it to morphological and surface roughness data. The results demonstrated that wavelet decomposition and RMS could provide a rapid insight on the location of coarser materials and individual outliers, while arithmetic surface roughness were more useful to detect units or layers that are similar on the outcrop. The method also emphasizes the fact that the automation of the process does not allows clear distinction between any artefact crack or surface change and that human supervision is still essential despite the original goal of automating the outcrop surface analysis.
Geospatial Assessment of Coseismic Landslides in Baturagung Area Saputra, Aditya; Sartohadi, Junun; Hadmoko, Danang Sri; Gomez, Christopher
Forum Geografi Vol 29, No 2 (2015): December 2015
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v29i2.693

Abstract

Java, the most densely populated island in Indonesia, is located on top of the most seismically active areas in Southeast Asia: the Sunda Megathrust. This area is frequently hit by strong earthquake. More than 3,300 M>5earthquakesoccurred between 1973-2014. The wide range of mountainous areas and high intensity of rainfall, make several part of the island one of the most exposed regions for coseismic landslides such as Baturagung area, the Southeast mountainous area of Yogyakarta Province. An integrated method between RS and GIS was used to conduct the vulnerability assessment due to the lack of the site specific slope instability analysis and coseismic landslides data. The seismic zonation of Baturagung area was obtained based on the analysis of Kanai attenuation. The geologic information was extracted using remote sensing interpretation based on the 1:100,000 geologic map of Yogyakarta and geomorphologic map of Baturagung area as well. The coseismic landslide hazard assessment has been estimated using scoring analysis in the GIS platform proposed by Mora and Vahrson (1993) with several modification. The accomplished coseismic landslide hazard map shows medium hazard coverage in the eastern areas, in the upper slope of Baturagung area, which consists of Semilir Formation. The result provides a distinct description of coseismic landslides hazard distribution in Batuaragung area. However, it should only be the preliminary assessment of the site specific investigation especially on valuable area or asset. 
Geospatial Assessment of Coseismic Landslides in Baturagung Area Aditya Saputra; Junun Sartohadi; Danang Sri Hadmoko; Christopher Gomez
Forum Geografi Vol 29, No 2 (2015): December 2015
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v29i2.693

Abstract

Java, the most densely populated island in Indonesia, is located on top of the most seismically active areas in Southeast Asia: the Sunda Megathrust. This area is frequently hit by strong earthquake. More than 3,300 M5earthquakesoccurred between 1973-2014. The wide range of mountainous areas and high intensity of rainfall, make several part of the island one of the most exposed regions for coseismic landslides such as Baturagung area, the Southeast mountainous area of Yogyakarta Province. An integrated method between RS and GIS was used to conduct the vulnerability assessment due to the lack of the site specific slope instability analysis and coseismic landslides data. The seismic zonation of Baturagung area was obtained based on the analysis of Kanai attenuation. The geologic information was extracted using remote sensing interpretation based on the 1:100,000 geologic map of Yogyakarta and geomorphologic map of Baturagung area as well. The coseismic landslide hazard assessment has been estimated using scoring analysis in the GIS platform proposed by Mora and Vahrson (1993) with several modification. The accomplished coseismic landslide hazard map shows medium hazard coverage in the eastern areas, in the upper slope of Baturagung area, which consists of Semilir Formation. The result provides a distinct description of coseismic landslides hazard distribution in Batuaragung area. However, it should only be the preliminary assessment of the site specific investigation especially on valuable area or asset. 
Photogrammetry-based Texture Analysis of a Volcaniclastic Outcrop-peel: Low-cost Alternative to TLS and Automation Potentialities using Haar Wavelet and Spatial-Analysis Algorithms Christopher Gomez; Kyoko Kataoka; Aditya Saputra; Patrick Wassmer; Atsushi Urabe; Justin Morgenroth; Akira Kato
Forum Geografi Vol 31, No 1 (2017): July 2017
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v31i1.3977

Abstract

Numerous progress has been made in the field of applied photogrammetry in the last decade, including the usage of close-range photogrammetry as a mean of conservation and record of outcrops. In the present contribution, we use the SfM-MVS method combined with a wavelet decomposition analysis of the surface, in order to relate it to morphological and surface roughness data. The results demonstrated that wavelet decomposition and RMS could provide a rapid insight on the location of coarser materials and individual outliers, while arithmetic surface roughness were more useful to detect units or layers that are similar on the outcrop. The method also emphasizes the fact that the automation of the process does not allows clear distinction between any artefact crack or surface change and that human supervision is still essential despite the original goal of automating the outcrop surface analysis.
Predisposition Factor of Safety of Landslide Dams from Typhoon Talas, Kii Peninsula, Japan Daikai Rikuto; Gomez Christopher; Balazs Bradak; Aditya Saputra; Danang Sri Hadmoko
Forum Geografi Vol 36, No 2 (2022): December 2022
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v36i2.20668

Abstract

Landslide dams are less frequent than other landslides, and their very existence is often very-much short-lived, because the temporary dam tends to collapse rapidly. Because of the resulting lack of evidences, there has been less research done on this topic, although the potential catastrophe they can be at the origin of needs assessment. For this purpose, the present contribution aims at differentiating landslides that trigger dams against those that do not inside a group of valleys of the Kii peninsula in Japan, where landslides occurred af-ter the typhoon Talas in 2011. Using topographic map before the event and LiDAR data in its aftermath, the authors have calculated the factor of safety (FS) of different landslides in the same valleys, comparing the da-ta of landslides that created dams against those that did not. The results show that landslides that triggered dams seemed to have a higher FS than those that did not. The authors suggest that it is because larger land-slides are needed and thus appear more stable, but also because at the location where the slopes are stable, the riverbed can incise further instead of growing horizontally, and thus the sediments damming the channel have more chances to block it (as it is narrow) and stop the river from flowing.
Co-Authors Abdillah Ishak, Laili Abdul Haris Achmad Zainul Rozikin Agustyaningsih, Wahyu Akira Kato Al-Ghowazi, Sholakhuddin Akhmad Altair, Garin Rachmad Anshari, Hafiz Anuggrah, Putri Dwi Ari Prasetyo Aribawa, Rangga Aryadewi, Ni Komang Chintya Astuti, Amelia Dwi Atsushi Urabe Atussolihah, Mar Aulia, Hanung Garnish Baihaqi , Akhmad Balazs Bradak Batu Bara, Fidia Dewi Wulandari Chandrahadinata, Doddy Christopher Gomez Christopher Gomez Christopher Gomez, Christopher Daikai Rikuto Danang Sri Hadmoko Danang Sri Hadmoko Danang Sri Hadmoko Danardono Danardono Danardono, Danardono Danovan, Adryan Marcellino DEDI SURACHMAN, DEDI Deviana, Kadek Saskia Amelia Dewi Indriani Diniya, Dilla Fadilla, Ardhiani Farida, Rahma Afifah Nur Fitrah, Rahma Hidayati Fransisca, Christina Gomez Christopher Hermanto Hermanto Hidayat, Rusdi Hulwa, Hazimah Alfiyah I Gusti Ketut Agung Ulupui Ilahi, Bogy Restu Ilham Ilham Iqbal, Deni Junun Sartohadi Justin Morgenroth Kamajaya, Rafka Kataoka, Kyoko Kato, Akira Kumala Dewi, Dinda Kusumasari, Indah Kyoko Kataoka Lenny Christina Nawangsari Lestari, Hesi Desta Lharasati Dewi M Iqbal Taufiqurrahman Sunariya Maharani, Deli Misyanto Morgenroth, Justin Muhammad Natsir Muliyani, Deta Mulyantini, Sri Nadia Alfitri Nafisah, Fathiyya Novrian, Wili Nur Annisa Pakpahan, Dinda Krisnauli Pasaribu, Estrada Joseph Hasoloan Patrick Wassmer Permadi , Angga Repi Permadi, Andes Priandika, Adhie Thyo Priska , Novelin Puji Lestari, Marsela Puspita, Kavia Dwi Putra , Christian Ade Putra, Said Willya Putri Rosamy, Dinda Rahmadan, Bavio Robia Rahmadi, Dinda Putri Ramia, Ramia Roza Susanti Saiful Ridwan Samba, Nayelli Mi'raz Saputri, Utamy Sukmayu Saskiacarpani, Leony Sefudin, Akhmad Sejati, Sadewa Purba Setiawan, Ilyas Nur Sitanggang , Adrian Milan Baros Situmorang, Gurilina Sri Rahayuningsih, Eni Sri Sunarsih Stevie Husein Suartawan, Putu Eka Subhan, Robi Septian Sulistyaningsih, Eka Sumarni, Riten Sutisyana, ari Syafitri, Helen Novelia Syafrial Syahid Nur Khotib Syamsul Bahri Ulfa Cahyani Putri, Savirna Urabe, Atsushi Wangsa, Gede Dinar Waskito, Tri Putra Wassmer, Patrick Wati, Agustina Ambar Wibowo, Afif Ari Widyatmika, I Gusti Ayu Made Wahyu Wirawan, I Gede Yudi Setiawan Yul Antonisfia Yultrisna Yultrisna Zairin, Gentiga Muhammad