SESAR GESER SORONG SEGMEN SORONG-KOFIAU, PAPUA BARAT, INDONESIA: BUKTI DARI DATA BATIMETRI DAN SBP

Haryadi Permana, Karit Lumban Gaol

Abstract


Ekspedisi Widya Nusantara (e-Win) yang dilaksanakan LIPI pada tahun 2007 dengan menggunakan Kapal Riset Baruna Jaya VIII di daerah lepas pantai Sorong dan Kepulauan Raja Ampat telah menghasilkan beragam data antara lain data batimetri dan data profil geologi bawah permukaan. Sesar Sorong segmen Sorong-Kofiau yang teridentifikasi dari kedua jenis data tersebut memanjang barat daya - timur laut sepanjang 170km. Lajur sesar tersebut membentuk lembah sedalam 2025-2300m di sekitar lepas pantai Kota Sorong, mendangkal sampai 600-700m di Selat Sagewin sampai ke arah P. Kofiau. Sesar Sorong merupakan sesar geser sinistral dicirikan oleh struktur bunga positif, lipatan seret dan cekungan tarik. Di selatan segmen sesar tersebut, Blok Kepala Burung bagian baratdaya dicirikan oleh suatu paparan yang dibatasi oleh sesar-sesar bongkah.
Kata Kunci: Sesar Sorong segmen Sorong-Kofiau, sesar geser sinistral, struktur bunga positif, lipatan seret, cekungan tarik, sesar bongkah

The expedition of Widya Nusantara (e-Win) carried out by LIPI in 2007 using Baruna Jaya VIII Research Vessel in Sorong offshore and Raja Ampat Islands had produced various data including bathymetry and sub-bottom profile (SBP). The Sorong-Kofiau segment of Sorong fault has southwest-northeast in direction and 170Km length, is identified from both types of data. The fault zone forms deep valley of about 2025-2300ms depth in the north coast of Sorong City, shallowing up to 600-700ms in the Sagewin Strait and towards Kofiau Island. The Sorong Fault is sinistral strike-slip fault characterized by positive flower structure, drag fold and pull apart basin. Along the south of the Sorong Fault, the micro continent southwestern of Bird's Head Block is characterized by shelfal morphology and bounded by block faults.
Keywords: Sorong-Kofiau segment of Sorong Fault, sinistral strike-slip fault, positive flower structure, drag fold, pull apart basin, block faults


Keywords


Sesar Sorong segmen Sorong-Kofiau;sesar geser sinistral;struktur bunga positif;lipatan seret;cekungan tarik;sesar bongkah

References


Benz, H.M, Herman, M., Tarr, A.C., Hayes, G.P., Furlong, K.P., Villaseñor, A., Dart, R.L., 1 and Susan Rhea, S. 2011. Seismicity of the Earth 1900–2010 New Guinea and Vicinity. Data Compilation of Open-File Report 2010–1083-H. U.S. Department of The Interior, U.S. Geological Survey

Earthquake map. 2017. https://earthquake.usgs.gov/earthquakes/2017-03-02

Hamilton, W. B., 1979. Tectonic of Indonesian region. Denver, US.S Govern. Printing office, 345 p.

Hasanudin, M. 2010. Morfologi Sesar Sorong Dari Data A=Seiismik dan Batimetri Resolusi Tinggi. Jurnal Segara Vol. 6, No. 1 Agusstus 2010: 39-46

Harding, T.P. 1985. Seismic Characteristic and Identification of Negative Flower Structure, Positive Flower Structure, and Positive Structural

Inversion. The AAPG Bulletin. V.69. No. 4; p.582-600

Harding, T.P. 1990. Identification of Wrench Faults using Subsurface Structural Data: Criteria and Pitfalls. The AAPG Bulleting. V.74. No. 10; p.1590-1609

Lee, T.-Y., and Lawver, L.A, 1995. Cenozoic plate reconstruction of Southeast Asia. Tectonophysics, v. 251, p. 85 - 138.

Muflihah, I. 2014. Distribusi dan Pola Sesar Daerah Kepala Burung (Papua Barat). Jurnal Neutrino Vol. 6, No. 2 April 2014

Pigram C.J. and Panggabean H. 1984. Rifting of eastern margin of the Australian continent and the origin of some microcontinents in Indonesia. Tectonophysics. V.107, p. 331-353.

Rangin, C., Jolivet, L., Pubellier, M. and the Tethys Pacific Working Group, 1990. A simple model for the tectonic evolution of southeast Asia and Indonesia region for the past 43 m.y., Bull. Soc. géol. France.,v. (8), t. VI, no. 6 ; p. 889-905.

Riadini, P., Adyagharini, A.C., Surya Nugraha, A.M., Sapiie, B., Teas, P.A. 2009. Palinspatic Reconstruction of The Bird Head Pop-Up Structure as a New Mchanism of The Sorong Fault. Procc. IPA. Thirty-Third Annual Convention & Exhibition, May 2009

Riadini, P., dan Sapiie, B. 2011. The Sorong Fault Zone Kinematics: Implication for Structural Evolution on Salawati Basin, Seram and Misool, West Papua, Indonesia. Adapted from ePoster presentation at AAPG Annual Convention and Exhibition, Houston, Texas, USA, April 10-13, 2011

Sapiie, B., Hadiana, M., Masio Patria, M., Adyagharini, A.C., Saputra, S., Teas,

P., Widodo. 2012. 3D Structural Geology Analysis Using Integrated Analogue Sandbox Modeling: a Case Study of The Seram Thrust-Fold Belt. Procc. IPA. Thirty-Sixth Annual Convention & Exhibition, May 2012

Saputra, A., Hall., R dan White, LT. 2014. Development of The Sorong Fault Zone North of Misool, Eastern Indonesia. Procc. IPA, Thirty-Eight Annual Convention & Exhibition, May 2014

Susilohadi, S. Gaedicke, C., Ehrhardta, A. 2005. Neogene structures and sedimentation history along the Sunda forearc basins off southwest Sumatra and southwest Java Marine Geology 219 (2005) 133–154

Sylvester, A.G. 1988. Strike-Slip Faults. Geological Society of America Bulletin, v. 100, p. 1666-1703, 31

USGS, 2009;.M7.6 and M7.4 Papua, Indonesia, Earthquake of January 2009.

Visser, W.A. and Hermes, J.J. 1962. Geological Results of The Exploration for oil in Netherlands New Guinea. Koninklijk Nederlands Geologisch mijnbouwkundig Genootschap. Geologisch serie, deel XX. Speciaal nummer. Carried out by The ‘Nederlandsche Nieuw Guinee Petroleum Maatschappij’ 1935-1960. Staatdruk Kerij-En Uitgeverijbedrijf 1962.




DOI: http://dx.doi.org/10.32693/jgk.v16i1.543