摘要
By using the digital observations of the pendulum tiltmeter, water tube tiltmeter,extensometer and volumetric strainmeter at Huzhou station and with the power spectrum density estimation method,we acquired the_0S_5-_0S_50 fundamental sphere free oscillations caused by the Japan earthquake on March 11,2011,then compared it with the PREM model. The relative errors are mostly bigger than 1.2‰. The extensometer and volume strainmeter can clearly detect _0S_2,_0S_3and_0S_4,which are closely related to the deep structure and earth's interior.
By using the digital observations of the pendulum tiltmeter, water tube tiltmeter,extensometer and volumetric strainmeter at Huzhou station and with the power spectrum density estimation method,we acquired the0S5-0S50 fundamental sphere free oscillations caused by the Japan earthquake on March 11,2011,then compared it with the PREM model. The relative errors are mostly bigger than 1.2‰. The extensometer and volume strainmeter can clearly detect 0S2,0S3and0S4,which are closely related to the deep structure and earth＇s interior.
基金
funded by the“Three-in-One”subject of China Earthquake Administration(201324)
the Science and Technology Projects of Earthquake Administration of Zhejiang Province(2015ZJJ03)
关键词
自由振荡
地震激发
地球内部
观测资料
地震台
湖州
英文
探测
Pendulum tiitmeter
Water tube tiitmeter
Extensometer
Volumetric strainmeter
Free oscillation of the earth
