Leni Sophia Heliani, Cecep Pratama, Parseno Parseno, Nurrohmat Widjajanti, Dwi Lestari


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; Sangihe Island; seismicity; secular

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Altamimi, Z., Rebischung, P., Métivier, L., & Collilieux, X. (2016). ITRF2014: A new release of the International Terrestrial Reference Frame modeling nonlinear station motions. Journal of Geophysical Research: Solid Earth.

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

Feng, L., Hill, E. M., Banerjee, P., Hermawan, I., Tsang, L. L. H., Natawidjaja, D. H., … Sieh, K. (2015). A unified GPS-based earthquake catalog for the Sumatran plate boundary between 2002 and 2013. Journal of Geophysical Research B: Solid Earth, Vol. 120, pp. 3566–3598.

Forsyth, D., & Uyedaf???, S. (1975). On the Relative Importance of the Driving Forces of Plate Motion. Geophysical Journal of the Royal Astronomical Society, 43(1), 163–200.

Guillaume, B., Martinod, J., & Espurt, N. (2009). Variations of slab dip and overriding plate tectonics during subduction: Insights from analogue modelling. Tectonophysics.

Hall, R. (2018). Neogene history of collision in the Halmahera region, Indonesia.

Hanifa, N. R., Sagiya, T., Kimata, F., Efendi, J., Abidin, H. Z., & Meilano, I. (2014). Interplate coupling model off the southwestern coast of Java, Indonesia, based on continuous GPS data in 2008-2010. Earth and Planetary Science Letters, 401, 159–171.

Heliani, L. S., Kurniawan, M. G., Kurniawan, A., & Swastiko, F. A. (2018). Quality Analysis of the Geodetic Control Networks for Purposes of

Geodynamics Study of Sangihe Island. Proceedings - 2018 4th International Conference on Science and Technology, ICST 2018.

Herring, T., King, R., & McClusky, S. (2015). GAMIT/GLOBK Reference Manuals, Release 10.6. Cambridge.

Hu, Y., & Wang, K. (2012). Spherical-Earth finite element model of short-term postseismic deformation following the 2004 Sumatra earthquake. Journal of Geophysical Research, 117(B5), 1–15.

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.

Jarrard, R. D. (1986). Relations among subduction parameters. Reviews of Geophysics.

Kreemer, C., Blewitt, G., & Klein, E. C. (2014). A geodetic plate motion and Global Strain Rate Model. Geochemistry, Geophysics, Geosystems, 15(10), 3849–3889.

Lyard, F., Lefevre, F., Letellier, T., & Francis, O. (2006). Modelling the global ocean tides: Modern insights from FES2004. Ocean Dynamics.

McCaffrey, R., Silver, E. A., & Raitt, R. W. (2011). Crustal structure of the Molucca Sea collision zone, Indonesia.

Nguyen, N., Griffin, J., Cipta, A., & Cummins, P. R. (2015). Indonesia’s Historical Earthquakes: Modelled examples for improving the national hazard map.

Okada, Y. (1995). Simulated Empirical Law of Coseismic Crustal Deformation. Journal of Physics of the Earth, 43, 697–713.

Silver, E. A., & Moore, J. C. (2008). The Molucca Sea Collision Zone, Indonesia. Journal of Geophysical Research: Solid Earth.

Widiyantoro, S., & Van der HIlst Hilst, R. (1997). Mantle structure beneath Indonesia inferred from high-resolution tomographic imaging. Geophysical Journal International, 130, 167–182.


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