利用2010年玉树7.1级地震资料估计地球球型振荡Q值  

Q VALUE OF SPHERICAL OSCILLATION ESTIMATED FROM SEISMIC RECORDS OF YUSHU Ms7.1 EARTHQUAKE IN 2010

作　　者：李振月[1] 万永革[1] 肖修来 汪圆圆[1] 

机构地区：[1]防灾科技学院,河北三河065201

出　　处：《高原地震》2015年第A12期34-40,共7页Plateau Earthquake Research

摘　　要：利用中国数字地震台网(CDSN)的7个台站记录的2010年4月14日玉树地震的波形资料,采用功率谱方法测定相继时间间隔内较清楚地球自由振荡频谱峰的能量,并采用最小二乘拟合方法确定了相应振型的Q值。结果表明不同振型的Q值明显不同,同一振型在不同台站计算得到的Q值也有略微差异。分析认为,前者可能源于地球自由振荡振型频率和探测深度不同所致,而后者可能与地壳的横向不均匀特性有关。The average energies of spherical oscillation modes in every time interval after Yushu Ms7.1 earthquake on April 14^th, 2010 are estimated by spectrum power density method from 7 seismic records of the China Digital Seismograph Network （CDSN）. Q values of the corresponding modes are calculated by linear fitting method. The result shows that the Q values vary with different spherical oscillation modes, and the same mode is slightly different in different stations. The former result is from the different frequency of the spherical oscil- lation mode and its related to domain depth. The latter result is from the inhomogeneity in horizontal direction.

关 键 词：玉树地震 功率谱 球型自由振荡 Q值 

分 类 号：P315.2[天文地球—地震学]