Pemetaan Magnitude of Completeness (Mc) untuk Gempa Sumatera

Authors

  • Jenny Teresia Simamora Jurusan Fisika FMIPA Universitas Andalas
  • Elistia Liza Namigo Jurusan Fisika FMIPA Universitas Andalas

DOI:

https://doi.org/10.25077/jfu.5.2.179-186.2016

Abstract

Telah dilakukan estimasi nilai Mc, nilai-b dan nilai-a menggunakan data gempa bumi dari katalog USGS (United States Geological Survey) dari Januari 1970 sampai Maret 2015 dengan batas 90°BB - 106°BB dan 6°LU - 6°LS dengan skala magnitudo Mw≥4 SR sampai 9 SR pada kedalaman maksimum 300 km yang meliputi wilayah Sumatera dan Samudera Hindia. Dalam penelitian ini digunakan Software ZMAP under MATLAB. Estimasi Mc dilakukan secara spasial dan temporal dengan menggunakan dua metoda yaitu metoda MAXC dan EMR. Variasi nilai Mc secara spasial kemudian dipetakan dengan bin size 250 secara spasial dan secara temporal persepuluh tahun untuk melihat evolusi nilai Mc selama empat dekade terakhir. Dari analisis diatas, diperoleh Mc sekitar 4,2 SR sampai 5,6 SR (nilai Mc rata-rata adalah 4,6 SR), Nilai-b berkisar 0,6 sampai 1,1 dan variasi nilai-a berkisar 5 sampai 7,5. Berdasarkan pemetaan nilai Mc, Sumatera bagian utara dan daerah lepas pantai barat Sumatera memiliki nilai Mc yang rendah yaitu (4.6-4,9) SR. Ini menandakan bahwa data gempa untuk daerah-daerah tersebut cukup lengkap di banding daerah lain. Berdasarkan pemetaan nilai-b dan nilai-a, wilayah yang memiliki tingkat kegempaan yang relatif tinggi dan memiliki potensi gempa-gempa besar adalah wilayah Aceh, Simeulue, Nias, Mentawai dan sekitar Bengkulu. Variasi Mc secara temporal relatif menurun selama empat dekade terakhir. Hal ini menunjukkan bahwa kemampuan perekaman data gempa relatif baik.

Kata Kunci: pemetaan Mc, nilai-b, nilai-a, MAXC, EMR.

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Published

2016-04-01

How to Cite

Simamora, J. T., & Namigo, E. L. (2016). Pemetaan Magnitude of Completeness (Mc) untuk Gempa Sumatera. Jurnal Fisika Unand, 5(2), 179–186. https://doi.org/10.25077/jfu.5.2.179-186.2016

Issue

Vol. 5 No. 2 (2016)

Section

Articles

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Copyright (c) 2016 Jenny Teresia Simamora, Elistia Liza Namigo

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