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利用不同倾斜仪和应变仪检测地球自由振荡的对比与分析
孟方杰,张燕
作者单位E-mail
孟方杰 中国地震局地震研究所(地震大地测量重点实验室), 武汉市武昌区洪山侧路40号 430071  
张燕 中国地震局地震研究所(地震大地测量重点实验室), 武汉市武昌区洪山侧路40号 430071 zhangyyy2007@126.com 
摘要:
中国地震局地壳形变观测台网布设有垂直摆倾斜仪、钻孔倾斜仪、洞体应变仪、分量式钻孔应变仪与体应变仪等地形变观测仪器。这些观测仪器均记录到了2011年日本MW9.0大地震激发的自由振荡信号。本文分别利用单台数据和多台数据叠积,检测到0S30S30全部的球型自由振荡基频振型和0T30T20全部的环型自由振荡基频振型及部分谐频振型。此外,通过对这些检测结果的对比,分析了它们对不同自由振荡类型、不同频段的振型检测能力。分析发现垂直摆倾斜仪对球型自由振荡的检测结果最佳,且由于在低频段有较高的噪声干扰,钻孔倾斜仪无法检测到低阶的球型自由振荡。对于环型自由振荡的检测,分量式钻孔应变仪检测结果最佳。
关键词:  倾斜仪  应变仪  傅里叶变换  叠积
DOI:
分类号:P315
基金项目:中国地震局科研专项(17A18ZX085)资助
Contrast and Analysis of Detection of the Earth's Free Oscillation Using Different Tiltmeter and Strainmeter
Meng Fangjie,Zhang Yan
Abstract:
The Crustal Deformation Observatory Network of China Earthquake Administration equips with many kinds of crustal deformation observation instruments. These instruments have recorded the earth's free oscillation excited by the Japan MW9.0 earthquake. All of the spheroidal oscillation modes(0S3~0S30)and toroidal oscillation modes(0T3~0T20)excited by the Japan MW9.0 earthquake were detected through processing and analyzing those single or multiple group observation data. In addition,through comparing the different detective results obtained by those instruments,we analyze their capacity to observe different kinds of oscillation and different frequency band modes. We find that,the vertical pendulum tiltmeter has the best result for observing spheroidal oscillation. Because of the high noise in low frequency band,the borehole tiltmeter cannot observe the low-order spheroidal oscillation. The multi-component borehole strainmeter has a best result for observing toroidal oscillation,and the tunnel extension meters can only observe some low-order modes.
Key words:  Tiltmeter  Strainmeter  Fourier transform  Product spectrum