利用Sato模型对宁夏及邻区尾波Q值的研究

英文篇名：Q Values of Seismic Coda in Ningxia and Adjacent Regions based on Sato Model
中文刊名：地震
英文刊名：Earthquake
作者：师海阔 ; 朱新运 ; 贺永忠 ; 张立恒
英文作者：SHI Hai-kuo1 ; ZHU Xin-yun2 ; 3 ; HE Yong-zhong1 ; ZHANG Li-heng1(1.Earthquake Administration of Ningxia Hui Autonomous Region ; Zhongwei 755000 ; China ; 2.Institute of Geophysics ; CEA ; Beijing 100081 ; China ; 3.Earthquake Administration of Zhejiang Province ; Hangzhou 310013 ; China)
中文关键词：Sato模型 ; 尾波Q值 ; 对频率依赖性 ; 宁夏及邻区 ; 小震密集区
英文关键词：Q value ; Sato model ; Ningxia and Adjacent regions ; Small earthquake concentration area
出版日期：2011-01-15
机构：宁夏地震局中卫地震台;中国地震局地球物理研究所;浙江省地震局;
年：2011
期：01
出版单位：地震

摘要

本文利用Sato模型,选取2008—2009年宁夏地震台网记录的121次ML≥2.0地震的数字地震波资料,计算宁夏及邻区平均尾波Q值,并拟合了Q值对频率的依赖关系。结果表明,与国内其他地区相比,宁夏及邻区Q值较低,对频率f依赖性较高。结合研究区同期地震活动水平及地震地质构造特征,将研究区划分为四个小震密集区:吉兰泰地震区、银川地震区、卫宁同地震区、固海地震区。分别统计并拟合Q值对频率的关系式为Q(f)=(53.59±17.08)f0.9148±0.0692;Q(f)=(53.04±16.29)f0.921±0.0777;Q(f)=(42.25±15.03)f0.9532±0.0787及Q(f)=(41.65±13.46)f0.9636±0.0774。对拟合结果进行比较表明,Q值分布较好地反映了相关构造区构造活动及地震活动水平。
Based on the Sato model,adopting digital wave datas of 121 earthquake above ML2.0 from January 2008 to December 2009,which were recorded by Ningxia earthquake nets,the average Q value of seismic coda in relative regions is calculated,and the relationship between Q value and frequency is polyfited.The whole region′s result is Q(f)=(44.81±15.87)·f 0.9491±0.0805.Compared with other regions,the Q value of seismic coda in Ningxia and adjacent regions is relatively lower,but the dependence on frequency is higher.According to the regional seismic tectonic characteristics and the homochronous seismic activity,we divided the research region into four concentrated minor-earthquake areas:(a) Ji Lantai,(b) Yin Chuan,(c) Wei Ningtong,(d) Gu Hai,and the calculated Q values of the four regions relatively are:(a) Q(f)=(53.59±17.08)f 0.9148±0.0692,(b) Q(f)=(53.04±16.29)f 0.921±0.0777,(c) Q(f)=(42.25±15.03)f 0.9532±0.0787,(d) Q(f)=(41.65±13.46)f 0.9636±0.0774.Comparison of the polyfited results shows that Q value′s distribution reflects the related region′s tectonic activities and seismic activity.

引文

[1]Chout B.Temporal Variation in the attenuation of earthquake coda near Stone Canyon,California[J].Geophys Res Lett,1979,6:143-146.
    [2]Jin A and Aki K.Temporal change inQcbefore the Tanshan earthquake of 1976 and the Haichengearthquake of 1975[J].J Geophys Res,1986,91:665-673.
    [3]Jin A and Aki K.Spatial and temporal correlation between Q-1and seismicity and its physical mech-anism[J].J Geophys Res,1989,94:14 041-14 059.
    [4]Aki K.Analysis of seismic coda of local earthquakes as scattered wave[J].J Geophys Res,1969,74:615-631.
    [5]Sato H.Energy propagation including scattering effect:Single isotropic scattering,approximation[J].Bull Seis Soc Amer,1977,68:923-948.
    [6]Domingguez T,Rebollar C J.Attenuation of coda waves at the Cerro Prieto Geothermal Field,BajaCalifornia,Mexico[J].Bull Seis Soc Amer,1997,87:1 368-1 374.
    [7]Pulli J.Attenuation of coda wave in New England[J].Bull Seis Soc Amer,1984,63:1 149-1 166.
    [8]李白基.云南姚安地区的尾波衰减[J].地震学报,2004,24(1):47-52.
    [9]朱新运,杨钢宇,张震峰.基于Sato模型的近震S波尾波Q值求解及分析软件研制[J].地震地磁观测与研究,2005,26(3):63-70.
    [10]Jacobson R S,Shor G G,Shor Jr,et al.A comparison of velocity and attenuation between the Nico-bar and Bengal deep sea fans[J].J Geophys Res,1984,89:6 181-6 196.
    [11]Carpenter P J,Sanford A R.ApparentQfor upper crustal rocks the central Rio Grande Rift[J].JGeophys Res,1985,90:8 661-8 674.
    [12]张天中,高龙生,张卫平.滇西实验场区的Q值极其随时间窗变化[J].地震学报,1990,12(1):12-21.
    [13]刘芳,苗春兰,高艳玲.内蒙古中西部地区尾波Q值研究[J].地震,2007,27(2):72-80.
    [14]魏红梅,贺曼秋,黄世源,等.重庆荣昌地区尾波Qc值特征[J].西北地震学报,2009,31(1):97-101.
    [15]李白基,秦嘉政,钱晓东,等.云南姚安地区的尾波衰减[J].地震学报,2004,26(1):47-52.
    [16]靳玉科,赵虎明,梁向军.山西代县震群尾波Q值研究[J].山西地震,2008,133(1):6-9.
    [17]杨明芝,马禾青,廖玉华.宁夏地震活动与研究[M].北京:地震出版社,2007.
    [18]赵卫明,刘秀景,马禾青.宁夏及邻区尾波Q值分布特征[J].华南地震,2002,22(1):23-27.