Q₀ Tomography of S Wave Attenuation in Northeast China and Adjacent Regions

详细信息   

• 责任者：Sun Lian (Institute of Geophysics ; China Earthquake Administration ; Beijing 100081 ; China) ; Li Yonghua
• 刊名：Chinese Journal of Geophysics
• 出版年：2012
• 卷期：55(4)
• 关键词：地壳 ; crust ; 横波 ; S-waves ; 衰减 ; attenuation ; 东北地区 ; Northeast China
• 页码：p.1179-1185
• 图表：3 illus., 45 refs.
• 分类号：0400
• issnNo：ISSN0001-5733
• isbnNo：CN11-2074/P

摘要

In this paper, the authors selected 46 652 ML amplitude readings from 6 371 events recorded by 146 stations as reported in the Annual Bulletin of Chinese Earthquakes （ABCE） and regional seismic network of Heilongjiang Province, Jilin Province, Liaoning Province and Inner Mongolia. A two-dimensional tomography method is adopted to find regional variation of crustal attenuation in Northeast China and its adjacent regions. The authors obtained an average Q₀ value of 323 for the entire studied region with regional fluctuations ±200. In most of the study area a resolution of 2 degrees is attained. Regions with the highest attenuation （low Q₀ values） are beneath Bohai Basin,and Songliao Plain and Hailaer Basin also have low Q₀ values,as these areas have thick sediments and strong tectonic activity. The entire northeast region shows a distribution pattern of alternating high and low attenuation.