Analysis of Sangihe Islands Movements derived from Recent GPS Observation

https://doi.org/10.22146/jgise.51146

Krishna Fitranto Nugroho(1), Leni Sophia Heliani(2*)

(1) Universitas Gadjah Mada
(2) Universitas Gadjah Mada
(*) Corresponding Author

Abstract


Sangihe Islands is one of the districts located in the border region of the Republic of Indonesia precisely located in North Sulawesi Province which borders with the Philippines. Sangihe subduction zone is a subduction between the Sangihe plate and the Maluku sea plate. (Di Leo, et al., 2012). This situation causes the Sangihe Islands region to be very prone to earthquake and others disasters, so mitigation efforts are needed to minimize casualties and losses in other material forms. One of these efforts is mapping the potential of earthquakes through Geodynamic studies which are represented at the point of deformation control. This study is using four times GNSS observations epoch 2015, 2016, 2017 and 2018 tied to ITRF 2014. The data used for 3D deformation analysis with the multiepoch method to calculate the movement speed of the Sangihe plate and simultaneous tectonic plate strain observation. The results of this study are the coordinates and accuracy values of monitoring point also the plate movement speed and annual tectonic plate strain values. The movement speed of the Sangihe plate is SGH1 point is having horizontal deformation of 9.88 mm / year to the southeast and vertical deformation descend by 58.66 mm/year. SGH3 point is having horizontal deformation of 12.74 mm/year to the southeast and vertical deformation descend by 18.51 mm/year. SGH4 point is having horizontal deformation of 19.04 mm/year to the southeast and vertical deformation descend by 5.27 mm/ year. This research also proves the hypothesis of a change in the volume of the Sangihe Islands tectonic plate based on the values of normal strain parameters and shear strain in the fraction of 10-6 to 10-4 strains.

Keywords


Sangihe Island, Geodynamics, Deformation, Speed, Strain

Full Text:

XML


References

Anugrah, B., Meilano, I., Gunawan, E., Efendi, J., (2015). Estimation of postseismic deformation parameters from continuous GPS data in northern Sumatra after the 2004 Sumatra-Andaman earthquake. Earthq. Sci. 28 (5-6), 347–352.

Di Leo, J. F., Wookey, J., Hammond, J.O.S., Kendall, J.M., Kaneshima, S., Inoue, H., Yamashina, T., Harjadi, P. (2012). Deformation and mantle flow beneath the Sangihe subduction zone from seismic anisotropy. Physics of the Earth and Planetary Interiors, 194–195, 38–54.

Gunawan, E dan Widiyantoro, S, (2019). Active tectonic deformation in java, Indonesia inferred from a GPS-derived strain rate. Journal of Geodynamics 123 (2019) 49–54.

Jaffe, L. A., Hilton, D. R., Fischer, T. P., & Hartono, U. (2004). Tracing magma sources in an arc-arc collision zone: Helium and carbon isotope and relative abundance systematics of the Sangihe Arc, Indonesia. Geochemistry, Geophysics, Geosystems.

Koulali, A., Susilo, S., McClusky, S., Meilano, I., Cummins, P., Tregoning, P., Lister, G., Efendi, J., Syafi’i, M.A., (2016). Crustal strain partitioning and the associated earthquake hazard in the eastern Sunda‐Banda Arc. Geophys. Res. Lett. 43 (5), 1943–1949.

Kurniawan, G., (2016). Analisis Deformasi Kepulauan Sangihe Berdasarkan data pengukuran GNSS Epoch 2014 dan Epoch 2015. Universitas Gadjah Mada.

Ladivanov, F., (2018). Analisis Deformasi Kepulauan Sangihe Berdasarkan Data Pengukuran GNSS Epoch 2014, 2015, 2016, dan 2017. Universitas Gadjah Mada.

Nugraha, S., (2017).  Analisis Deformasi Kepulauan Sangihe Berdasarkan Tiga Kala Pengamatan Data Pengukuran GNSS Tahun 2014, 2015 dan 2016. Universitas Gadjah Mada

Tatsumi, Y., Murasaki, M., Arsadi, E.M., Nohda, S. (1991). Geochemistry of Quaternary lavas from NE Sulawesi: transfer of subduction components into the mantle wedge. Contributions to Mineralogy and Petrology, 107(2), 137–149



DOI: https://doi.org/10.22146/jgise.51146

Article Metrics

Abstract views : 190 | views : 158

Refbacks

  • There are currently no refbacks.


Creative Commons License
This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.


The Contents of this website is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.

ISSN: 2623-1182 (Online)
Jl. Grafika No.2 Kampus UGM, Yogyakarta 55281
Email : jgise.ft@ugm.ac.id