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All Journal JURNAL ILMIAH GEOMATIKA Geoid - Journal of Geodesy and Geomatics
Parseno Parseno
Sekolah Vokasi Universitas Gadjah Mada
Agriculture, Biological Sciences & Forestry Earth & Planetary Sciences Engineering Environmental 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.
STUDY OF OPAK FAULT CONTROL POINT MOVEMENT IN SGY SEGMENT Taftazani, Muhammad Iqbal; Parseno, Parseno
GEOID Vol. 11 No. 2 (2016)
Publisher : Departemen Teknik Geomatika ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/geoid.v11i2.1497

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.
Estimasi Potensi Gempa Tektonik di Wilayah Sesar Opak Berdasarkan Data Pengamatan GPS Ulinnuha, Hilmiyati; Lestari, Dwi; Widjajanti , Nurrohmat; Parseno, Parseno; Pratama, Cecep; Heliani, Leni Sophia; Novianti, Suci Tresna
GEOID Vol. 18 No. 1 (2022)
Publisher : Departemen Teknik Geomatika ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/geoid.v18i1.1752

Abstract

Yogyakarta merupakan daerah ring of fire dengan adanya wilayah-wilayah subduksi lempeng tektonik. Kondisi ini mengakibatkan tingginya potensi gempa tektonik di daerah Yogyakarta. Seperti pada tahun 2006, telah terjadi gempa tektonik dengan skala 6,3 Mw di Yogyakarta dan menimbulkan dampak negatif. Gempa ini disebabkan oleh aktivitas Sesar Opak. Berdasarkan penelitian sebelumnya, segmen patahan Sesar Opak tidak semua melepaskan energi, sehingga dimungkinkan berpotensi menimbulkan gempa tektonik besar di masa yang akan datang. Oleh karena itu, penelitian ini bertujuan untuk mengenalisis dan mengestimasi potensi gempa tektonik di sekitar wilayah Sesar Opak berdasarkan data pengamatan GPS. Penelitian ini juga mengestimasi maximum magnitude dan periode perulangan maximum magnitude tersebut. Data yang digunakan dalam penelitian ini adalah data pengamatan GPS pada titik-titik pantau Sesar Opak sejumlah 11 buah dari tahun 2016, 2017, dan 2018. Data pengamatan GPS diolah dengan perangkat lunak GAMIT/GLOBK. Data diolah dengan membagi area menjadi sebelah Timur dan sebelah Barat Sesar Opak. Selanjutnya, dilakukan perhitungan estimasi maximum magnitude dan periode perulangan maximum magnitude. Hasil dari pengolahan data GPS menunjukkan bahwa resultan kecepatan pergeseran horizontal titik pantau Timur Sesar Opak lebih besar dari pada titik pantau Barat Sesar Opak. Hal ini dapat mengindikasikan Timur Sesar Opak lebih aktif dari pada Barat Sesar Opak. Adanya pergeseran aktif ini dapat menimbulkan potensi gempat tektonik dikemudian hari. Selain itu, hasil estimasi maximum magnitude yang dapat terjadi di wilayah Sesar Opak adalah 6,5 Mw dengan periode perulangan maximum magnitude selama ± 60 tahun pada Segmen Utara dan selama ± 130 tahun pada Segmen Selatan. Namun hasil perhitungan estimasi ini masih perlu disempurnakan dengan dengan menambahkan data lain seperti seismik multitemporal.
Co-Authors Cecep Pratama Dwi Lestari Heliani, Leni Sophia Muhammad Iqbal Taftazani, Muhammad Iqbal Novianti, Suci Tresna Nurrohmat Widjajanti Pratama, Cecep Ulinnuha, Hilmiyati Widjajanti , Nurrohmat