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Dhota Pradipta
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Journal : Bulletin of Geology

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KONTRIBUSI PENGAMATAN GEODESI MODERN DALAM MEMAHAMI DINAMIKA TEKTONIK DI INDONESIA: ESTIMASI KUTUB EULER LEMPENG MINOR SUNDA Dina Anggreni Sarsito; Susilo Susilo; Dhota Pradipta; Heri Andreas
Bulletin of Geology Vol 3 No 1 (2019): Bulletin of Geology
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/bull.geol.2019.3.1.5

Abstract

Penentuan Kutub Euler Sesaat Resen pada saat ini adalah salah satu kontribusi bidang geodetik untuk penentuan geo-kinematik bumi menggunakan asumsi geometrik bola ideal. Parameter kutub Euler diestimasi berdasarkan perubahan kecepatan/ pergerakan minimal tiga stasiun GNSS-GPS yang terletak di zona rigid yang sama. Dengan menggunakan best fitting L2-Norm dari data observasi GNSS GPS pada tahun 1992-2017, hasil estimasi yang dihasilkan memberikan sensitivitas yang tidak homogen terhadap pola distribusi titik pengamatan. Residu absolut dari pengamatan terhadap hasil estimasi kecepatan kutub Euler akan menunjukkan keberadaan stasiun di dalam atau di luar zona rigid. Dengan menerapkan semua langkah yang disebutkan, nilai estimasi Kutub Euler Sesaat Resen dari blok mikro Sunda adalah di bawah 5mm/tahun untuk residu absolut dengan akurasi hingga 1mm/tahun, dengan demikian parameter ini dapat digunakan sebagai informasi geo-kinematik yang akurat. Kata kunci: Geodesi, Lempeng Minor, Sunda, Kutub Euler, L2-Norm Minimization
ORTHOMETRIC HEIGHT DETERMINATION IN JAKARTA AND SUNDA STRAIT AREA USING THE GEOPOTENTIAL NUMBER APPROACH Dina Anggreni Sarsito; Brian Bramanto; Heri Andreas; Dhota Pradipta; Sidiq Triwibowo
Bulletin of Geology Vol 8 No 1 (2024): Bulletin of Geology Vol. 8 no. 1
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

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Abstract

Orthometric height is a physical height type used by Indonesia in local/national reference systems for determining positions used in various scientific and engineering activities. The main constraint in determining orthometric height is that it is theoretically difficult to realize that gravity measurements must be carried out along the plumb lines that connect the topographic equipotential surface with the geoid surface. Another constraint is that it requires precise physical height difference measurements from tie points, which are usually located in coastal areas, to locations on land that are far from the coast. This research examines the possibility of determining orthometric physical height at several GNSS GPS stations in the Jakarta and Sunda Strait areas using the geopotential number approach as an alternative solution to the difficulties caused by the aforementioned constraints. The first type of orthometric height obtained from GNSS GPS geodetic height observations with geoid undulation obtained from the EGM2008 global gravity model is then used as a comparison for the second type of orthometric height obtained from the geopotential number approach. The pattern of geopotential numbers on the islands of Java and Sumatra has the same pattern, namely that the value increases as the topographic elevation increases. This phenomenon is in line with the terrestrial survey approach carried out so far, that the mean sea level can be assumed to be an estimate of the geoid surface, which is used as a reference for the gravity potential surface. The average difference in height between the two types of orthometric height is 0.39 meters, with a difference interval between -1.80 meters and 2.73 meters. The results obtained show that the geopotential number approach can be used as an alternative for determining orthometric height if direct gravity measurements and/or precise physical height difference measurements cannot be carried out in the monitoring area.
Co-Authors Brian Bramanto Dina Anggreni Sarsito Dina Anggreni Sarsito Heri Andreas Sidiq Triwibowo Susilo Susilo