摘要: |
利用湖州地震台垂直摆倾斜仪、水管倾斜仪、伸缩仪和体应变仪等观测资料,采用功率谱密度估计方法,获得2011年3月11日日本9.0级大地震激发的0S5~0S50 基频球型自由振荡数据;比对PREM模型的理论计算周期,其相对偏差均小于1.2‰,且体应变观测的相对偏差最小;伸缩仪和体应变仪能清晰地检测到与地壳深部结构密切关系的0S2、0S3和0S4低阶振型。 |
关键词: 垂直摆倾斜仪 水管倾斜仪 伸缩仪 体应变仪 地球自由振荡 |
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基金项目:中国地震局三结合课题(CEA-JC/3JH-161101)、浙江省地震局科技项目(2015ZJJ03)联合资助 |
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Detecting the free oscillation of the earth by use of observational data at Huzhou Seismostation |
Fang Yanxun1) Biang Genfa1) Hui Ruoyu2) Sun Zongqiang3)
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1)Huzhou Seismic Station,Earthquake Administration of Zhejiang Province,Huzhou 313000,Zhejiang, China;2)Earthquake Administration of Zhejiang Province,Hangzhou 310013,China;3)Bureau of Earthquake Prevention and Disaster Reduction of Shuifu County,Shuifu 657800, Yunnan, China
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Abstract: |
By using digital observations of the pendulum tilt-meter,water tube tilt-meter,extensometer and volume-strain-meter at Huzhou seismic station and with power spectrum density estimation method,we acquired 0S5~0S50 fundamental sphere free oscillations caused by the March 11,2011 Japan earthquake,and then compared it with PREM model. The relative errors are mostly smaller than 1.2‰. Extensometer and volume-strain-meter can clearly detect 0S2,0S3 and0S4 which is closely related to the deep structure and earth's interior. |
Key words: Pendulum tiltmeter Wate tube tiltmeter Extemsometer Volumestrainmete Free oscillation of the earth |