| 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 |
| DOI： |
| 分类号: |
| 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 |
|
| Detecting the free oscillation of the earth by use of observational data at Huzhou Seismostation |
|
Fang Yanxun1) Biang Genfa1) Hui Ruoyu2) Sun Zongqiang3)
|
|
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
|
| 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 |
