Parseno Parseno
Sekolah Vokasi Universitas Gadjah Mada

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STUDY OF OPAK FAULT CONTROL POINT MOVEMENT IN SGY SEGMENT Taftazani, Muhammad Iqbal; Parseno, Parseno
Geoid Vol 11, No 2 (2016)
Publisher : Department of Geomatics Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (546.34 KB) | DOI: 10.12962/j24423998.v11i2.1259

Abstract

The observation of Opak fault in DIY Province has been done in many times to observe the movement of Opak Fault after 2006 earthquake. This research aims to determine the coordinates in the new epoch (2015) and to determine the movement velocity of Opak fault control point between 2013 and 2015. The research done by GPS/GNSS observations in eight hours with sampling rates 15 second, and GPS/GNSS processing using GAMIT/GLOBK software. The research results shows that there are coordinate differences between 2013, 2014 and 2015 epoch that indicate there is a movement in Opak fault control point with velocity between 0,01 – 0,09 m/yr in horizontal movement and 0,001 – 0,047 m/yr in vertical movement. The movement direction of Opak fault control point is south east except SGY3 point that move to  south west. The movement of Opak fault control point is classified by BSN with the extraordinary very slow category.
GNSS Monitoring Network Optimization Case Study: Opak Fault Deformation, Yogyakarta Widjajanti, Nurrohmat; Emalia, Sherly Shinta; Parseno, Parseno
Jurnal Geospasial Indonesia Vol 1, No 1 (2018): June
Publisher : Department of Geodetic Engineering, Faculty of Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jgise.38458

Abstract

Opak fault is a fault located in Opak River area, Bantul. The existence of the fault is one of the biggest causes of earthquake in Yogyakarta in 2006. The seismic potential caused by the active fault requires continuous geodynamic monitoring. The GNSS network (TGD, SGY, and OPK) have been developed since 2013 consists of 17 stations and in 2016 there was an additional number of four monitoring stations. Several high-precision monitoring stations distributed at the fault location are needed to monitor the fault movement. Optimal observation network is one of the factors to obtain high precision station coordinates. The GNSS network optimization has been carried out in the previous research partially on each network; namely the segment of TGD, SGY, and OPK. Therefore, this research conducts a thoroughly optimization for 17 monitoring stations either use old or new stations to obtain an optimal network based on the criteria of accuracy and reliability.The network is designed widely from simple to complex combination and to combination between network segments. The computation uses least squares adjustment with parameter method. The value of the cofactor matrix parameter of the adjustment is applied to analyze the network based on the function of the accuracy criteria, namely A-Optimality, D-Optimality, E-Optimality, S-Optimality, and I-Optimality. Meanwhile, the value of the residual cofactor matrix is used for network configuration analysis based on the reliability objective function, namely the individual redundancy, external and internal reliabilities criteria. The result showed that the design of TGD, SGY and OPK network segments are optimized based on the criteria of accuracy and reliability if they use a network design with a complex baseline. The criteria for accuracy and reliability in the design with a combination of segments such as TGD and SGY, TGD and OPK, as well as TGD, SGY, and OPK are not much different from the optimization results performed by each segment. Therefore, if the measurements are carried out with a limited receiver, it is better to use each of segment designs.
GPS Technology Implementation for Sangihe Islands' Movement Monitoring in 2017-2019 Ulinnuha, Hilmiyati; Lestari, Dwi; Heliani, Leni Sophia; Widjajanti, Nurrohmat; Pratama, Cecep; Parseno, Parseno; Nugroho, Krishna Fitranto
Jurnal Geospasial Indonesia Vol 2, No 2 (2019): December
Publisher : Department of Geodetic Engineering, Faculty of Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jgise.51033

Abstract

Sangihe Islands belong to a complex tectonic area at the subduction of the Eurasian plate and the Philippine Sea. Sangihe subduction zones are complex subduction zone, so that there is a need for continuous movement monitoring. Previous research had been carried out to monitor movement of the Sangihe subduction zone, but no monitoring has been done in 2019. Therefore, this study aims to monitor movement of Sangihe subduction zones with the latest observation data.This study aims to obtain velocity of Sangihe Islands plate movement during 2017 to 2019. Observation was performed using 3 monitoring control points for 7 days in 2019. While observation data from 2017 to 2018 were obtained from previous studies. Observations was carried out using GNSS differential method technology. Loosely constrained of weighted parameter was performed in least square adjustment of GNSS data daily processing, while Kalman Filtering algorithm applied for combining multiyear GNSS data to estimate the velocity refer to ITRF 2014 using GAMIT/GLOBK.This study indicates that Sangihe Islands has horizontal movement to the Southeast with velocity vector of 1 to 2.16 cm/year. This results confirm the previous studies in that area.