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All Journal Indonesian Journal of Geography JURNAL ILMIAH GEOMATIKA JGISE-Journal of Geospatial Information Science and Engineering Jurnal Pengabdian dan Pengembangan Masyarakat
Cecep Pratama
Teknik Geodesi, Fakultas Teknik, Universitas Gadjah Mada
Humanities Earth & Planetary Sciences Education Engineering Environmental Science Languange, Linguistic, Communication & Media Library & Information Science Mathematics

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GPS-DERIVED SECULAR VELOCITY FIELD AROUND SANGIHE ISLAND AND ITS IMPLICATION TO THE MOLUCCA SEA SEISMICITY Heliani, Leni Sophia; Pratama, Cecep; Parseno, Parseno; Widjajanti, Nurrohmat; Lestari, Dwi
GEOMATIKA Vol 26, No 2 (2020)
Publisher : Badan Informasi Geospasial in Partnership with MAPIN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24895/JIG.2020.26-2.1199

Abstract

Sangihe-Moluccas region is the most active seismicity in Indonesia. Between 2015 to 2018 there is four M6 class earthquake occurred close to the Sangihe-Moluccas region. These seismic active regions representing active deformation which is recorded on installed GPS for both campaign and continuous station. However, the origin of those frequent earthquakes has not been well understood especially related to GPS-derived secular motion. Therefore, we intend to estimate the secular motion inside and around Sangihe island. On the other hand, we also evaluate the effect of seismicity on GPS sites. Since our GPS data were conducted on yearly basis, we used an empirical global model of surface displacement due to coseismic activity. We calculate the offset that may be contained in the GPS site during its period. We remove the offset and estimate again the secular motion using linear least square. Hence, in comparison with the secular motion without considering the seismicity, we observe small change but systematically shifting the motion. We concluded the seismicity in the Molucca sea from 2015 to 2018 systematically change the secular motion around Sangihe Island at the sub-mm level. Finally, we obtained the secular motion toward each other between the east and west side within 1 to 5.5 cm/year displacement.
GPS Technology Implementation for Sangihe Islands' Movement Monitoring in 2017-2019 Hilmiyati Ulinnuha; Dwi Lestari; Leni Sophia Heliani; Nurrohmat Widjajanti; Cecep Pratama; Parseno Parseno; Krishna Fitranto Nugroho
Jurnal Geospasial Indonesia Vol 2, No 2 (2019): December
Publisher : 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.
Coseismic Displacement Accumulation Between 1996 and 2019 Using A Global Empirical Law on Indonesia Continuously Operating Reference Station (InaCORS) Cecep Pratama; Febrian Fitryanik Susanta; Ridho Ilahi; Alian Fathira Khomaini; Hadi Wijaya Kusuma Abdillah
Jurnal Geospasial Indonesia Vol 2, No 2 (2019): December
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jgise.51130

Abstract

Indonesia archipelago is one of the most populated country with active and complex tectonic zone in the world. Plate boundaries were assembled by four major plate which made the region not only vulnerable to earth-hazard but also prone to semi-dynamic reference frame. However, influence of transient deformation such as coseismic displacement due to large amount of small to intermediate earthquakes (< Mw 6) on the geodetic networks is remain poorly understood. Geospatial Information Agency occupied permanent and continuous GPS networks since 1996 but rapidly increase in 2010. Based on simulated empirical law of coseismic crustal deformation, we estimate the cumulative displacement due to coseismic step on Indonesia Continuous Operating Reference Stations (InaCORS). We utilize the position of the observation network and earthquake hypocentral with estimated moment magnitude. Our result suggesting small to intermediate earthquakes are indispensable for estimating secular motion and potentially contribute the cumulative offset associated with the transient postseismic deformation.
Penentuan Posisi Titik-Titik Pemantauan Banjir Di Desa Segoroyoso, Kecamatan Pleret, Kabupaten Bantul, Provinsi DIY Hilmiyati Ulinnuha; Aris Sunantyo; Bilal Ma&#039;ruf; Parseno Parseno; Nurrohmat Widjajanti; Leni Sophia Heliani; Dwi Lestari; Dedi Atunggal; Cecep Pratama
Jurnal Pengabdian dan Pengembangan Masyarakat Vol 4, No 2 (2021): NOVEMBER 2021
Publisher : Pengabdian dan Pengembangan Masyarakat Sekolah Vokasi UGM

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jp2m.67933

Abstract

Desa Segoroyoso merupakan wilayah yang rawan terhadap adanya bencana alam seperti gempa bumi, banjir, dan tanah longsor. Bencana alam yang sering dialami di Desa Segoroyoso adalah banjir Sungai Opak yang berdampak menggenangi pemukiman warga di Dusun Karanggayam dan Dusun Dahromo I. Sering terjadinya banjir di Desa Segoroyoso membutuhkan penanganan dan mitigasi bencana. Sebagai langkah awal mitigasi banjir, diperlukan titik pantau berupa tanda dilapangan yang mudah diidentifikasi oleh warga tentang elevasi air yang mulai menggenang. Oleh karena itu kegiatan ini bertujuan untuk menentukan posisi horizontal dan vertikal titik pemantauan banjir di Desa Segoroyoso. Titik pemantauan banjir ini diharapkan akan menjadi panduan para warga tentang kemungkinan terjadinya banjir. Posisi horizontal titik pemantau banjir ini akan diukur menggunakan instrumen Global Navigation Satelite System (GNSS) dan posisi vertikal didapatkan melalui pengukuran sipat datar. Hasil dari kegiatan ini adalah koordinat horizontal titik pantau dalam SRGI 2013 serta tinggi orthometriknya.
Importance of Tropospheric Correction to C-band InSAR Measurements: Application in the 2018 Palu Earthquake Hidayat Panuntun; Leni Sophia Heliani; Wiwit Suryanto; Cecep Pratama
Indonesian Journal of Geography Vol 54, No 3 (2022): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijg.68984

Abstract

Long-term InSAR-based observations are prone to atmospheric delay interference. The active-phase signals emitted and recorded back by sensors during imaging are easily disturbed by the electron content in the ionospheric layer and the water vapor content in the tropospheric layer. Given that the short wavelength of the C-band used by Sentinel-1 is more sensitive to tropospheric delay than to ionospheric delay, in this work, we utilized InSAR Sentinel-1 data to observe the postseismic deformation that occurred following the 2018 Palu earthquake and to evaluate the effect of tropospheric delay on the estimated interferogram time series. The cloud computation of Looking into Continent from Space with Synthetic Aperture Radar (LiCSAR) and LiCSBAS was used to generate interferograms and analyze the time series. Here the atmospheric delay was modeled by using Generic Atmospheric Correction Online Service (GACOS) and removed from the generated interferograms. Results showed that the annual velocity and cumulative line-of-sight (LOS) displacement were refined by correcting the atmospheric delay. Specifically, by applying GACOS, the standard deviation of the generated interferograms decreased by up to 76.6%. GNSS observations were utilized to verify the improvement due to the removal of tropospheric noise. We found that LOS displacement with GACOS correction better fitted the GNSS observation than LOS displacement without GACOS correction. Therefore, atmospheric correction plays an important role in long-term InSAR-based observations, especially in avoiding any bias in the interpretation of the estimated time series.
Co-Authors Alian Fathira Khomaini Aris Sunantyo Bilal Ma&#039;ruf Dedi Atunggal Dwi Lestari Dwi Lestari Dwi Lestari Dwi Lestari Febrian Fitryanik Susanta Hadi Wijaya Kusuma Abdillah Heliani, Leni Sophia Hidayat Panuntun Krishna Fitranto Nugroho Nurrohmat Widjajanti Nurrohmat Widjajanti Parseno Parseno Parseno Parseno Parseno Parseno Parseno Parseno Ridho Ilahi Suci Tresna Novianti Ulinnuha, Hilmiyati Wiwit Suryanto