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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 the_0S_5-_S_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, _S_3and_OS_4, which are closely related to the deep structure and earth’s interior.