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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. 相似文献
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基于对中国大陆已发生的22个8级大震的研究,发现8级大震的发生有其规律性,这种规律性表现在8级大震发生的年份可组成一个矩形地震链,这种规律可用来对中国大陆8级大震进行预测。 相似文献
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