Response of tilt and strain meters in Hubei province to the 2011 Mw9. 0 Japan earthquake  

作　　者：Sun Lingli Li Ming Wei Guichun Luo Junqiu Zhang Weihua 

机构地区：[1]Institute of Seismology, China Earthquake Administration, Wuhan 430071, China

出　　处：《Geodesy and Geodynamics》2011年第4期46-52,共7页大地测量与地球动力学（英文版）

摘　　要：Tih and strain meters of the deformation-observation network in Hubei Province all responded to the Mw9.0 Japan earthquake on March 11,2011. By analyzing the co-seismic responses,we found that firstly there was essentially a linear correlation between response time and epicentral distance. Secondly, there was some correlation between maximum response amplitude and earthquake magnitude as well as between the duration and earthquake magnitude. Thirdly, the response amplitudes and decay rates were different for different types of instruments. Due to less data-sampling frequency, the deformation instruments, could not display the first motion of P and S waves, but responded mainly to far-field surface waves. Before the earthquake, the NS earthtide component recorded by the cave stainmeter at Yichang was distorted for nearly eight hours. While digital deformation observation did not show complete information about the earthquake source, it still reflected some key features of seismic-wave propagation.Tilt and strain meters of the deformation-observation network in Hubei Province all responded to the Mw9. 0 Japan earthquake on March 11,2011. By analyzing the co-seismic responses,we found that firstly there was essentially a linear correlation between response time and epicentral distance. Secondly,there was some correlation between maximum response amplitude and earthquake magnitude as well as between the duration and earthquake magnitude. Thirdly,the response amplitudes and decay rates were different for different types of instruments. Due to less data-sampling frequency,the deformation instruments,could not display the first motion of P and S waves,but responded mainly to far-field surface waves. Before the earthquake,the NS earthtide component recorded by the cave stainmeter at Yichang was distorted for nearly eight hours. While digital deformation observation did not show complete information about the earthquake source,it still reflected some key features of seismic-wave propagation.

关 键 词：Mw9.0 Japan earthquake co-seismic effect crustal deformation observation at fixed sites 

分 类 号：P315.9[天文地球—地震学] U442.55[天文地球—固体地球物理学]