唐山地区尾波Q值特征研究  

Study on the Characteristics of Coda Wave Q Value in Tangshan Region

作　　者：李金 宫猛 臧阳[3] 付震 朱音杰 LI Jin;GONG Meng;ZANG Yang;FU Zhen;ZHU Yinjie(Tangshan Seismic Monitoring Central Station,Tangshan 063000,China;East China University of Technology,Nanchang 330013,China;China Earthquake Networks Center,Beijing 100045,China;The Second Geological Brigade of Hebei Geology and Mineral Exploration and Development Bureau,Tangshan 063000,China;Hebei Earthquake Agency,Shijiazhuang 050021,China)

机构地区：[1]唐山地震监测中心站,河北唐山063000 [2]东华理工大学,南昌330013 [3]中国地震台网中心,北京100045 [4]河北省地质矿产勘查开发局第二地质大队,河北唐山063000 [5]河北省地震局,石家庄050021

出　　处：《华南地震》2022年第3期48-57,共10页South China Journal of Seismology

基　　金：江西省自然基金(20202BABL203035);中国地震局“监测、预报、科研”三结合课题(3JH-202202055);河北省地震科技星火计划攻关项目(DZ202108090110);河北省地震科技星火计划青年项目(DZ2021121600002)联合资助。

摘　　要：选取2008—2020年河北省数字地震台网记录的唐山地区86次M_(L)≥3.0地震事件波形资料,基于Sato单次散射模型,获得唐山地区尾波Q值随频率的时空变化特征。结果显示:唐山地区平均尾波Q值与频率f之间的关系为Q(f)=(53.33±18.23)f^( 0.9029±0.0858),与国内其它地区相比,本研究区的Q值相对较低;唐山地区M_(L)4.5以上地震多发生在Q值下降过程中,且Q值在震前一段时间内呈现上升变化,震后则呈现下降变化;唐山地区的尾波Q值存在显著的横向不均匀性,北部山区明显高于南部平原地区,东部地区明显高于西部地区,沿着北东向的唐山断裂从西南向东北Q值逐渐升高。The paper collected 86 seismic events waveform of earthquakes withM_(L)≥3.0 in Tangshan region from 2008 to 2020 recorded by Hebei digital seismic network.Based on Sato single scatter model,the temporal and spatial variation characteristics coda waveQ value with frequency in Tangshan region are obtained.The results show that:the relationship between the average of coda waveQ value and frequency in Tangshan area isQ(f)=(53.33±18.23)f^(0.9029±0.0858),which is relatively low compared with other regions in China;most of the earthquakes withM_(L)≥4.5 occured in Tangshan area during the decline process ofQ value,moreover,the Q value showed an upward change in the period before the earthquake, and showed a downward change after the earthquake;there is significant lateral inhomogeneity of the coda wave Q values in Tangshan region, the northern mountains were significantly higher than the southern plains, The value in the eastern region was significantly higher than the southern region, and theQ value of Tangshan fault along the NE trending increases gradually from southwest to northeast.

关 键 词：唐山地区 SATO模型 尾波Q值 时空变化特征 

分 类 号：P315.73[天文地球—地震学]