KAJIAN AWAL TENTANG b Value GEMPA BUMI DI SUMATRA
DOI:
https://doi.org/10.26740/jpfa.v3n1.p41-46Keywords:
b value, precursor, tren gempa bumi, gempa bumi yang akan datangAbstract
Telah dilakukan penelitian yang bertujuan untuk menganalisis tren gempa bumi di Sumatra dan kemungkinan implikasinya terhadap gempa bumi yang akan datang dengan menggunakan b value sebagai precursor. Data statistik gempa bumi yang digunakan adalah gempa bumi dengan magnitudo mulai dari 4 sampai 8,5 dan dengan kedalaman 0 sampai 70 km. Selanjutnya data tersebut dianalisis dengan metode statistik dengan formula empirik dari Gutenberg and Richter. Kecenderungan kejadian gempa bumi semakin meningkat selama 49 tahun terakhir. Bahkan setelah gempa bumi tahun 2004 peningkatan kejadian gempa bumi semakin tajam. Hal ini diduga disebabkan oleh proses pencapaian keseimbangan energi yang dialami oleh lempeng, sehingga terjadi gempa bumi-gempa bumi susulan yang berkelanjutan sampai terjadi keseimbangan energi. Nilai konstanta b value gempa bumi di Sumatra tergolong rendah, yaitu 0,865. Nilai ini menggambar tingkat stress yang tinggi, sehingga peluang besar terjadinya gempa bumi besar akan terjadi lagi di Sumatra.References
Gutenberg, B., and C. Richter (1944), Frequency of earthquakes in California, Bull.
Seismol. Soc. Am., 34, 185-188.
Lasitha, S., Radhakrishna, M., and Sanu, T.D.., 2006. Seismically Active deformation in the Sumatra-Java Trench-arc region: Geodynamic Implications, Current Science, 90. No. 5.
McCaffrey, R, 1991, Slip vectors and stretching of the Sumatran fore arc, Geology, 19, 881-884. DOI:10.1130/0091-7613(1991)019<0881:SVASOT>2.3.CO;2
Natawidjaya, D.H, 2002, Neotectonics of the Sumatra Fault and Paleogeodesy of the Sumatra Subduction Zone, California Institute of Technology Pasadena, California (Thesis).
Nuannin, Paiboon (2006). The Potential of b-value Variations as Earthquake Precursors for Small and Large Events, Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology 183
nterseismic strain segmentation at the Sumatra subduction zone, Geophysical Research Letters, 24, 2601-2604.
Seismol. Soc. Am., 34, 185-188.
Lasitha, S., Radhakrishna, M., and Sanu, T.D.., 2006. Seismically Active deformation in the Sumatra-Java Trench-arc region: Geodynamic Implications, Current Science, 90. No. 5.
McCaffrey, R, 1991, Slip vectors and stretching of the Sumatran fore arc, Geology, 19, 881-884. DOI:10.1130/0091-7613(1991)019<0881:SVASOT>2.3.CO;2
Natawidjaya, D.H, 2002, Neotectonics of the Sumatra Fault and Paleogeodesy of the Sumatra Subduction Zone, California Institute of Technology Pasadena, California (Thesis).
Nuannin, Paiboon (2006). The Potential of b-value Variations as Earthquake Precursors for Small and Large Events, Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology 183
nterseismic strain segmentation at the Sumatra subduction zone, Geophysical Research Letters, 24, 2601-2604.
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Published
2013-06-14
How to Cite
Madlazim, M. (2013) “KAJIAN AWAL TENTANG b Value GEMPA BUMI DI SUMATRA”, Jurnal Penelitian Fisika dan Aplikasinya (JPFA), 3(1), pp. 41–46. doi: 10.26740/jpfa.v3n1.p41-46.
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