Analisa Pola Bidang Sesar Pada Zona Subduksi di Wilayah Selatan Pulau Sumatera dari Event Gempa Pada Tahun 2011-2014

Riski Salim, Bagus Jaya Santosa
Submission Date: 2014-08-08 10:47:11
Accepted Date: 2014-09-14 11:50:41

Abstract


Pada penelitian membahas tentang momen tensor dan pola bidang patahan yang didapat dari focal mechanism gempa di selatan Pulau Sumatera Indonesia menempati zona tektonik yang sangat aktif karena tiga lempeng besar dunia dan sembilan lempeng kecil lainnya saling bertemu di wilayah Indonesia,  gempa-gempa yang terjadi di Pulau Sumatera merupakan implikasi geodinamika dari deformasi aktif di sekitar Sunda dan Java trench, dalam menentukan momen tensor dan focal mechanism-nya menggunakan program ISOLA-GUI. Data yang digunakan dalam penelitian ini mempunyai magnituda lebih dari sama dengan 5.5 Skala Ritcher. Dari hasil penelitian didapatkan bahwa berdasarkan pengolahan data gempa yang diakibatkan oleh Sesar Mentawai mempunyai pola sesar reverse fault dan pola sesar dip-slip. Dalam penelitian ini didapatkan besar rentang momen tensor untuk masing-masing komponennya sebesar M11 =2.531 exp15 sampai 0.205 exp18, M22 = 3.495 exp15 sampai 0.337 exp18, M33 = 0.964 exp15 sampai 0.131 exp18, M31 = 0.544 exp15 sampai 5.174 exp18,  M32 = 1.107 exp15 sampai 4.113 exp18, dan M12 = 1.140 exp15 sampai 0.430 exp18 dan besar slip rata-rata adalah 274.71 meter.


Keywords


Moment tensor; Focal Mechanism; reverse fault; dip slip;

References


Bird, P., (2003), An updated digital model of plate boundaries: Geochemistry, Geophysics, Geosystems, v. 4, no. 3, 1027, doi:10.1029/2001GC000252.

Yeats R, Sieh, K, and allen, C., 1997. The geology of Earthquakes, 568 pp., Oxford Univ., Press, New York.

Hanks, T., Boore, D. M., 1984. Moment-Magnitude Relations in Theory and Practice. Journal of Geophysical Research, Vol. 89, No. B7, pages 6229-6235.

Leonard, M., 2010. Earthquake Fault Scaling: Self-Consistent Relating of Rupture Length, Width, Average Displacement, and Moment Release. Bulletin of the Seismological Society of America, Vol. 100, No. 5A, pp. 1971-1988.

Madlazim. 2011. Estimasi CMT, Bidang Sesar dan Durasi Rupture Gempa Bumi di Sumatera serta Kemungkinan Penerapannya untuk Sistem Peringatan Dini Tsunami. Disertasi Jurusan Fisika FMIPA ITS Surabaya.

Madlazim, Santosa, B. J., 2010. Seismic moment tensors of padang 20090930 and Jambi 20091001 Events in Jambi using Three Component Local Waveforms: Identification of the Active Fault Plane. Indonesian Jurnal of Physics Vol 21 No. 4.

Mardrinovella, I., Widiyantoro, S., Irwan, M., 2011. Relokasi Hiposenter Gempa Padang 30 September 2009 Menggunakan Metode Double Difference. JTM Vol.XVIII No. 1.

Prasetya, Tiar., 2006. Gempa Bumi; Ciri dan Cara Menanggulanginya. Yogyakarta : GITANAGARI.

Sokos, E. N., Zahrandik, J., 2008. ISOLA a Fortran code and a Matlab GUI to perform multiple-point source inversion of seismic data. Computers and Geoscience 34. 967-977.

Sokos, E. N., Zahrandik, J., 2009. A Matlab GUI for use with ISOLA Fortran codes. User's Guide.

Stein, S., Wysession, M., 2003. An Introduction to Seismology, Earthquakes, and Earth Structure. Oxford : Blackwell Publishing Ltd.


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