In Tokyo Metropolitan University, the horizontal and vertical array earthquake observations has begun in June 1994 at the five stations （kl-k5） on the ground surface and bedrock （k6：-30 m depth） at Zushi-site. Mo...In Tokyo Metropolitan University, the horizontal and vertical array earthquake observations has begun in June 1994 at the five stations （kl-k5） on the ground surface and bedrock （k6：-30 m depth） at Zushi-site. More than 200 medium and small earthquakes with the magnitude 5.0-7.3 were recorded between 1994 and 2012. At the 2011 off the Pacific coast of Tohoku Earthquake （EQ.3.11 M = 9.0）, the largest surface ground acceleration （kl = 124.5 gal, k6 = 45.5 gal） of the horizontal component was recorded. Main results were obtained as follows： （1） the surface ground motion characteristics of Zushi-site were examined using the observed data （kl ＆ k6） of EQ.3.11, the past-observed smaller earthquakes （EQ.1 ＆ EQ.10.08） and aftershock （EQ.12.3）, respectively. The non-liner seismic response characteristics of the surface ground at Zushi-site were verified during EQ.3.11. （2） The ground structure models were examined and identified by the modal analyses and the FEM （finite element method） identification analyses using the observed acceleration data of EQ.3.11 and the past observed smaller earthquakes. （3） Moreover, the three dimensional seismic response analyses were performed by TDAPUl （time domain 3-dimensional dynamic analysis program）, using k6 for input motions and identified ground structure model, and evaluated the dynamic behaviours of the surface ground. The calculated results agreed well with the observed ones.展开更多
文摘In Tokyo Metropolitan University, the horizontal and vertical array earthquake observations has begun in June 1994 at the five stations （kl-k5） on the ground surface and bedrock （k6：-30 m depth） at Zushi-site. More than 200 medium and small earthquakes with the magnitude 5.0-7.3 were recorded between 1994 and 2012. At the 2011 off the Pacific coast of Tohoku Earthquake （EQ.3.11 M = 9.0）, the largest surface ground acceleration （kl = 124.5 gal, k6 = 45.5 gal） of the horizontal component was recorded. Main results were obtained as follows： （1） the surface ground motion characteristics of Zushi-site were examined using the observed data （kl ＆ k6） of EQ.3.11, the past-observed smaller earthquakes （EQ.1 ＆ EQ.10.08） and aftershock （EQ.12.3）, respectively. The non-liner seismic response characteristics of the surface ground at Zushi-site were verified during EQ.3.11. （2） The ground structure models were examined and identified by the modal analyses and the FEM （finite element method） identification analyses using the observed acceleration data of EQ.3.11 and the past observed smaller earthquakes. （3） Moreover, the three dimensional seismic response analyses were performed by TDAPUl （time domain 3-dimensional dynamic analysis program）, using k6 for input motions and identified ground structure model, and evaluated the dynamic behaviours of the surface ground. The calculated results agreed well with the observed ones.
