Ground motion parameters of Shillong plateau: One of the most seismically active zones of northeastern India  

作　　者：Saurabh Baruah Santanu Baruah Naba Kumar Gogoi Olga Erteleva Felix Aptikaev J. R. Kayal 

机构地区：[1]Geoscience Division, North-East Institute of Science and Technology (CSIR) [2]National Geophysical Research Institute [3]Institute of Physics of the Earth [4]School of Oceanographic Studies, Jadavpur University

出　　处：《Earthquake Science》2009年第3期283-291,共9页地震学报（英文版）

基　　金：ILTP (Integrated Long Term Project) Scheme towards Indo-Russian Collaborative Project

摘　　要：Strong ground motion parameters for Shillong plateau of northeastern India are examined. Empirical relations are obtained for main parameters of ground motions as a function of earthquake magnitude, fault type, source depth, velocity characterization of medium and distance. Correlation between ground motion parameters and characteristics of seismogenic zones are established. A new attenuation relation for peak ground acceleration is developed, which predicts higher expected PGA in the region. Parameters of strong motions, particularly the predominant periods and duration of vibrations, depend on the morphology of the studied area. The study measures low estimates of logarithmic width in Shillong plateau. The attenuation relation estimated for pulse width critically indicates increased pulse width dependence on the logarithmic distance which accounts for geometrical spreading and anelastic attenuation.Strong ground motion parameters for Shillong plateau of northeastern India are examined. Empirical relations are obtained for main parameters of ground motions as a function of earthquake magnitude, fault type, source depth, velocity characterization of medium and distance. Correlation between ground motion parameters and characteristics of seismogenic zones are established. A new attenuation relation for peak ground acceleration is developed, which predicts higher expected PGA in the region. Parameters of strong motions, particularly the predominant periods and duration of vibrations, depend on the morphology of the studied area. The study measures low estimates of logarithmic width in Shillong plateau. The attenuation relation estimated for pulse width critically indicates increased pulse width dependence on the logarithmic distance which accounts for geometrical spreading and anelastic attenuation.

关 键 词：Shillong plateau ground motion parameter duration magnitude northeastern India 

分 类 号：P315.5[天文地球—地震学]