Evaluation of b-value variation of earthquakes in Papua New Guinea
Languages of publication
This study evaluated the b-value variation of earthquakes in Papua New Guinea region. The data used were extracted from International Seismological Centre (ISC), Pipers Lane, Thatcham, Berkshire, United Kingdom. The selected data consisted of earthquakes with Mb ≥ 2.6 for the study area from 1st January 1966 to 31st December 2015 (50 years) with focal depth from 0 – 700 km. The data were analyzed using Least Squares (LS) approximation method and SPSS Software version 20.0. The findings of this study categorized b-value into three groups: High, moderate and low. High b-value varies from 1.01 to 1.35, moderate b-value lies between 0.8 and 1.0 and low b-value varies from 0.63 to 0.80. This indicates that the years where high b-values occurred predominantly consist of many earthquakes of moderate magnitudes; slight decrease in b-value is associated with many earthquakes of large magnitudes and low b-value is associated with many earthquakes of small magnitudes. The b-value for the whole study area was calculated to be 0.91. The research hypothesis revealed that there is a significant difference in the b-value between the decade groups from 1966 to 2015. The F-ratio between the decade groups was found to be 3.776 with significant value of 0.010. The implication of this study is that temporal variation and monitoring of b-values will serve as one of the reliable ways of earthquake prediction in Papua New Guinea.
-  T.A. Adagunodo, L. Sebastian, M.A Adekunle, J. O Omidiora, A.P. Aizebeokhai, K.D. Oyeyemi, and S. Olaide and O.S Hammed. Evaluation of 0 < M < 8 earthquake datasets in African – Asian region during 1966–2015. Data in Brief 17 (2018) 588-603
-  M. O. Awoyemi, O.S. Hammed, O.H. Shode, O.T. Olurin, W.N. Igboama and J.O. Fatoba, Investigation of b-value variations in the African and parts off Eurasian plates. Journal of Tsunami Society International (2017) 36(2), 87-99
-  Y. Bayrak, A. Yılmaztürk and S. Öztürk. Lateral variation of the modal (a/b) values for the different regions of the world, J. Geodyn. 34 (2002) 653-666.
-  P. Mann and A.Taira. Global tectonic significance of the Solomon Islands and Ontong Java Plateau convergent zone. Tectonophysics 389 (2004) 137-190
-  S. Miyamura Magnitude frequency relation of earthquakes and its bearing to geotectonics. Proc. Japan Academy 38 (1962) 27
-  K. Mogi. Magnitude – frequency relationship for elastic shocks accompanying fractures of variousmaterials and some related problems in earthquakes, Bull. Earthquake Res. Inst. Univ. Tokyo 831 (1962) 40
-  J. Mori and R.E Abercrombie Depth dependence of Earthquakes frequency- magnitude distribution in California: Implications for future Initiation. Geophysical Research Journal (1997) 102(15) 081-090
-  P. Nuannin, O. Kulhanek and L. Persson, Spatial and temporal b value anomalies preceding the devastating off coast of NW Sumatra earthquake December 26, 2004, Geophys. Res. Lett 32 (2005) L11307
-  Papua New Guinea. Emergency Preparedness Operational Logistics Contingency Plan. Global Logistics Cluster-WFP, February-March (2011) 1-34
-  M.G. Petterson, T.Babbs, C.R. Neal, J. J. Mahoney, A.D. Saunders, R.A. Duncan, D. Tolia, R. Magu, C. Qopoto, H. Mahoa and D. Natogga. Geological–tectonic framework of Solomon Islands, SW Pacific: crustal accretion and growth within an intra-oceanic setting. Tectonophysics (1999) (301) 35-60
-  M. Pubellier and E. F Ego. Anatomy of an escape tectonic zone: Western Irian Jaya (Indonesia). Tectonics, 21(4) (2002)
-  I.D. Ripper, and H. Letz. Return periods and probabilities of occurrence of large earthquakes in Papua New Guinea. Papua New Guinea Geological Survey Report (1993) 93/1.
-  C. H. Scholz. The frequency–magnitude relation of microfracturing in rock and its relation to earthquakes, Bull. Seismol. Soc. Am. 58 (1968) 399-415
-  D. Schorlemmer, S. Wiemer and M. Wyss. Variation in earthquake-size distribution across different stress regimes. Nature 437(22) (2005) 539-542
-  D. Schorlemmer and S. Wiemer Microseismicity data forecast rupture area. Nature 434 (2005) 1086.
-  D. Schorlemmer, G. Neri, S. Wiemer and A. Mostaccio. Stability and significance tests for b-value anomalies: Example from the Tyrrhenian Sea, J. Geophys. Res 30(16) (2003) 1835
-  L.M. Wallace, B. J. McCaffrey and S. Ellis. Rapid microplate rotations and backarc rifting at the transition between collision and subduction. Geological Society of America. Geology 33(11) (2005) 857–860
-  N.W. Warren and G. V. Latham. An experiment study of thermal induced microfracturing and its relation to volcanic seismicity, J. Geophys. Res 75 (1970) 4455-4464
-  S.G. Wesnousky. The Gutenberg-Richter or characteristic earthquake distribution, which is it?, Bull. Seismol. Soc. Am. 84(6) (1994) 1940-1959
-  S. Wiemer and J. P. Benoit. Mapping the b-value anomaly at 100 km depth in the Alaska and New Zealand subduction zones, Geophys. Res. Lett., 23(13) (1996) 1557-1560
-  S. Wiemer and S. R. McNutt. Variation in the frequency-magnitude distribution with depth in two volcanic areas: Mount St. Helens, Washington, and Mt. Spurr, Alaska, Geophys. Res. Lett. 24(2) (1997) 189-192
-  S. Wiemer and M. Wyss. Mapping the frequency– magnitude distribution in asperities: An improved technique to calculate recurrence times? J. Geophys. Res. 102 (1997) 15115-15128
-  M. Wyss. Towards a physical understanding of the earthquake frequency distribution, Geophys. J. R. Astron. Soc. 31 (1973) 341-359
-  C.Yan and L. Kroenke. A plate tectonic reconstruction of the SW Pacific, 0-100Ma. In: T. Berger, L. Kroenke, L. Mayer et al. (Eds.), Proceedings of the Ocean Drilling Program. Scientific Results 130 (1993) 697-709
-  A.A. Abong, A.M. George and E.A. Awhuwhe. Investigation of time scale dependence of Gutenberg-Richter’s frequency-magnitude relationship in South Africa. International Journal of Applied Sciences and Engineering Research 5(2) (2016) 129-136
Publication order reference