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《Chinese Journal of Geophysics》 2018-03
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A broadband crustal Lg wave attenuation model in Northeast China and the Korean Peninsula

ZHAO LianFeng;XIE XiaoBi;WANG WeiMin;YAO ZhenXing;Key Laboratory of Earth and Planetary Physics,Institute of Geology and Geophysics, Chinese Academy of Sciences;Institutions of Earth Science,Chinese Academy of Sciences;Institute of Geophysics and Planetary Physics,University of California;Key Laboratory of Continental Collision and Plateau Uplift,Institute of Tibetan Plateau Research, Chinese Academy of Sciences;  
Lg wave propagation characteristics are investigated in Northeast China and the Korean Peninsula based on seismograms from 113 crustal earthquakes that were recorded at 602 regional stations distributed throughout eastern China,South Korea,and southern Japan.Based on 22,551 verticalcomponent waveforms,we calculate the amplitude spectra of the Lg waves,extract the singlestation,two-station,and two-event data,and construct a broadband Lg attenuation model between 0.05 and 10.0 Hz in Northeast China and the Korean Peninsula by using ajoint tomographic method to simultaneously obtain Q,source function,and site response.Results show that the sedimentary basin areas are characterized by relatively strong Lg attenuation,whereas the volcanic mountains such as Da Hinggan Ling and Changbai mountains attenuate theLg waves weakly.The strongest Lg attenuation regions are areas covered by sea water including Bohai Sea,Yellow Sea and Japan Sea.A thinner crust within a typical oceanic lithosphere for the Japan Sea blocks the Lg wave propagation,resulting in no signals can be observed across oceanic path from small earthquakes.We collect observations from large earthquakes with magnitude around mb6.0 to obtain strong Lg attenuation within the crust of Japan Sea.
【Fund】: 国家自然科学基金(41674060 41374065 41630210);; 川滇国家地震监测预报实验场项目(2016CESE 0203)资助
【CateGory Index】: P315
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【Citations】
Chinese Journal Full-text Database 9 Hits
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