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Seismic Analysis of the Korean Peninsula Using Multiple Lapse Time Window Method  

Chung, Tae-Woong (Department of Earth & Environmental Sciences, Sejong University)
Yoon, Suk-Yung (Korea Polar Research Institute, KORDI)
Publication Information
Geophysics and Geophysical Exploration / v.12, no.2, 2009 , pp. 199-207 More about this Journal
Abstract
From 329 earthquake data in the Korean Peninsula, we separated the intrinsic and scattering quality factor ($Q_i^{-1}$ and $Q_s^{-1}$) using the Multiple Lapse Time Window Analysis (MLTW) method. For the homogeneous velocity structure, $Q_i^{-1}$ reduces the amplitudes of both direct and coda waves; $Q_s^{-1}$ diminishes the direct wave amplitude but enlarges the coda wave amplitude. Based on this phenomenon, MLTW method analytically derives theoretical curves and obtains $Q_i^{-1}$ and $Q_s^{-1}$ by least square fit with observation curves. This study is the first approach for the seismic stable region by MLTW method, and show that $Q_i^{-1}$ and $Q_s^{-1}$ in the Korean Peninsula are very low at lower than frequencies of 5 Hz. This low value seems to be related to the inactive tectonism of the Korean Peninsula.
Keywords
Korean Peninsula; intrinsic quality factor; scattering quality factor; sesimic stable region; MLTW;
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