利用常熟地震台水管倾斜仪观测资料检测地球自由振荡  

DETECTING FREE OSCILLATIONS OF THE EARTH BY USING WATER-TUBE TILTMETER OBSERVATIONS AT CHANGSHU SEISMIC STATION

作　　者：狄樑[1] 陆德明[1] 丁建国[1] 刘冬冬[1] 

机构地区：[1]江苏省地震局常熟地震台,江苏常熟215500

出　　处：《高原地震》2015年第4期15-19,共5页Plateau Earthquake Research

摘　　要：利用常熟地震台水管倾斜仪的数字化观测资料，采用功率谱密度估计方法，在没有对资料进行去除固体潮处理的情况下，获得了2011年3月11日日本9．0级大地震激发的0S6—0S30基频球型自由振荡，并与地球初步参考模型（PREM）的理论自由振荡频率进行了对比，发现实测振荡频率与PREM预测的振荡频率基本符合。Based on the digital observation data of extensometer of water - tube tihmeters at Changshu seismic station,the spheroidal free oscillation of 0S6 - 0S30 basic frequency excited by Japan M9.0 earthquake on Mar. 11^th ,2011 is accurately gained by using power spectral density estimation in the condition without eliminating solid tide of the data. The result is contrasted with the theoretical free oscillation frequency of PREM, and found that the measured oscillation frequency mainly coincides with the oscillation frequency predicted by PREM.

关 键 词：水管倾斜仪 日本9.0级大地震 地球自由振荡 球型振荡 功率谱密度 

分 类 号：P315.2[天文地球—地震学]