Variasi Nilai Frekuensi, Akumulasi Energi dan Parameter Seismik secara Temporal di Wilayah Jayapura Periode 1965 - 2014
DOI:
https://doi.org/10.31957/sains.v16i1.135Abstract
The research about seismic condition was developed for Jayapura region during 1965 – 2014 period. This research was purposed to determine variation of temporal frequency, energy accumulation and seismic parameter values. Seismic parameter consist of a and b values. Secondary description method was used for this research. Time window sliding and simple statistic approximation methods was used in study of the variation values. Research areas is 2o – 4oN and 139o – 141oE.
The variation of frequency, energy accumulation and seismic parameter values to interval time can describe temporal seismic condition. Earthquake frequency during 1965 – 2014 period are dominated by minor earthquake, that is 912 events or 58,91% and shallow earthquake, that is 1264 events or 81,65%. The greatest energy accumulation total in interval time 50 years given by strong earthquake, that is 3,27775 × 1015 Joule or 87,32%, whereas minor earthquake only given 7,37860 x 1012 Joule or 0,20%. The greatest average a and b values occurs in interval time 1965 – 1994, that are 6.70947 and 0.89371 and the smallest average values occurs in interval time 1995 – 2004, that are3.80569 and 0.46910. The best a and b values were calculated in interval time 1965 – 1974, 1965 – 1984 and 1965 – 1994.
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Keywords : earthquake, frequency, energy accumulation, seismic parameter, JayapuraDownloads
References
Advanced National Seismic System (ANSS) Catalog Search, National California Earthquake Data Center (NCEDC).
Aki, K., 1965.Maximum Likelihood Estimate of b in the Formula log N = a-bm and its Confidence Limits, Bulletin Eartquake Research Institute, Tokyo University, 43, 237-239.
Bormann, P., and Di Giacomo, D., 2010. The moment magnitude and the energy magnitude : common roots and differences, Journal of Seismology, Springer Verlag (Germany), 15 (2), pp.411-427.
Chatterjee, S. and Hadi, A.S., 2006. Regression analysis by example, 4th Edition, page 28-32, John Wiley & Sons, Inc., New Jersey.
Gutenberg, B. and Richter, C.F., 1944. Frequency of earthquakes in California, Buletin of the Seismological Society of America, 4, 34, 185-188.
Gutenberg, B. and Richter, C.F., 1956. Magnitude and energy of earthquakes, Annali di Geofisica (Rome), 9, 1-15.
Ibrahim, G. dan Subardjo, 2003. Pengetahuan Seismologi, Badan Meteorologi dan Klimatologi, Manado.
Kanamori, H., 1977.The Energy Realease in Great Earthquake, Journal of Geophysical Research, 20, 82, 2981-2987.
Kulhanek, O., 2005. Seminar on b-Value, Department of Geophysics, Charles university, Prague.
Mantiri, S.Y.Y., 2010. Penentuan Distribusi Nilai Percepatan Tanah Maksimum di Wilayah Papua dan Papua Barat, Tesis, Universitas Gadjah Mada. Yogyakarta.
McGraw-Hill Companies, Inc., 2003. Dictionary of Geology and Mineral, Second Edition, New York.
Scawthorn, C., 2003. Earthquakes: Seismogenesis, Measurenment, and Distribution in Chen, W.F. and Scawthorn, C., EarthquakeEngineering Handbook, CRC Press LLC, Florida.
Spiegel, M.R. and Stephens, L.J., 2008. Schaum’s outline of theory and problems of statistics, 4th Edition, page 346-353, McGraw-Hill, New York.
Wood, H.O. and Neumann, F., 1931. Modified Mercalli Intensity Scale of 1931, Buletin of the Seismological Society of America, 21, 277-283.
