【摘要】 为比较VP型与SSQ型倾斜仪对强震激发的自由振荡的检测能力,基于佛子岭地震台观测资料,利用功率谱密度估计方法,提取2014年4月2日智利8.2级地震激发的0S3~0S37基频球型自由振荡,其中VP仪NS向检测到了26个振型,EW向检测到了25个振型;SSQ仪NS向检测到了25个振型,VP仪EW向检测到了20个振型,同时实测周期与PREM理论振荡周期相一致,只有0S5振型的观测周期与理论周期的最大差异达到0.85%,其他大部分最大差异都在0.2%以内。更多还原

【Abstract】 This article aims to make a comparison between VP type and SSQ type tiltmeters through the detection of free oscillations excited by a strong earthquake. We extracted the0S3~0S37- pitch spheroidal free oscillation excited by Chile M8. 2 earthquake from the observation data produced by VP type and SSQ type tiltmeters at Foziling station with the power spectrum density estimation method. The NS trending of VP type detected 26 modes and the EW trending of VP type detected 25 modes,while the NS trending of SSQ type detected 25 modes and the EW trending of SSQ type detected 20 modes. Except that the difference between the vibration observation cycle of0S5 mode and PREM mode cycle is more than 0. 85%,most of the other differences are within 0. 2%,and the extracted oscillation is accordant with the theoretical oscillation.更多还原