Long-period Strong Ground Motions in the Tokyo Bay Area Observed during Moderate-magnitude Earthquakes that Occurred in the Nankai Trough

2020 ◽  
Vol 73 (0) ◽  
pp. 179-196
Author(s):  
Tomiichi UETAKE
Keyword(s):  
Nankai Trough ◽  
Ground Motions ◽  
Tokyo Bay ◽  
Strong Ground Motions ◽  
Long Period ◽  
Bay Area ◽  
Moderate Magnitude ◽  
Strong Ground

scholarly journals Broadband Strong-Motion Prediction for Future Nankai-Trough Earthquakes Using Statistical Green’s Function Method and Subsequent Building Damage Evaluation

2021 ◽  
Vol 11 (15) ◽  
pp. 7041
Author(s):  
Baoyintu Baoyintu ◽  
Naren Mandula ◽  
Hiroshi Kawase
Keyword(s):  
Green’S Function ◽  
Green's Function ◽  
Nankai Trough ◽  
Ground Motions ◽  
Building Damage ◽  
Steel Buildings ◽  
Ground Acceleration ◽  
Attenuation Relations ◽  
Strong Ground Motions ◽  
Strong Ground

We used the Green’s function summation method together with the randomly perturbed asperity sources to sum up broadband statistical Green’s functions of a moderate-size source and predict strong ground motions due to the expected M8.1 to 8.7 Nankai-Trough earthquakes along the southern coast of western Japan. We successfully simulated seismic intensity distributions similar to the past earthquakes and strong ground motions similar to the empirical attenuation relations of peak ground acceleration and velocity. Using these results, we predicted building damage by non-linear response analyses and find that at the regions close to the source, as well as regions with relatively thick, soft sediments such as the shoreline and alluvium valleys along the rivers, there is a possibility of severe damage regardless of the types of buildings. Moreover, the predicted damage ratios for buildings built before 1981 are much higher than those built after because of the significant code modifications in 1981. We also find that the damage ratio is highest for steel buildings, followed by wooden houses, and then reinforced concrete buildings.

Factors Influencing Maximum and Residual Deformations of SDOF Systems Subjected to Large Ground Motions

2011 ◽  
Vol 243-249 ◽  
pp. 170-177
Author(s):  
Peng Pan ◽  
Yu Zhang ◽  
Shi Yan Song ◽  
Lie Ping Ye
Keyword(s):  
Structural Parameters ◽  
Ground Motions ◽  
Stiffness Degradation ◽  
Maximum Deformation ◽  
Strong Ground Motions ◽  
Long Period ◽  
Short Period ◽  
Residual Deformations ◽  
Yield Force ◽  
Strong Ground

The maximum and residual deformations of structures subjected to strong ground motions are the most importance indexes, particularly under the performance-based design framework, thus understanding the influencing factors is of great importance to seismic design. In this study, single degree of freedom (SDOF) systems with varying structural properties are analyzed using a series of strong ground motions from FEM/SAC project. The influences of three structural parameters, i.e., yield force, second stiffness after yielding, and stiffness degradation, on the maximum and residual deformations are investigated based on the statistics of the analysis results. The analysis results suggest the follows: (1) larger yield forces lead to smaller residual and maximum deformations for short period structures, and they lead to smaller residual deformations but no necessarily smaller maximum deformation for intermediate and long period structures; (2) larger second stiffness lead to smaller residual and maximum deformations for short period structures, and they lead to smaller residual deformations but no necessarily smaller maximum deformation for intermediate and long period structures; (3) smaller stiffness degradation index leads to smaller maximum deformations but larger residual deformations.

scholarly journals QUANTITATIVE PREDICTION OF LONG-PERIOD GROUND MOTIONS OF TOKYO BAY AREA FROM THE TOKAI EARTHQUAKE

2007 ◽  
Vol 72 (617) ◽  
pp. 55-62 ◽  
Author(s):  
Katsuichiro HIJIKATA ◽  
Tomiichi UETAKE ◽  
Junji KANAYA ◽  
Mitsugu MASHIMO ◽  
Takashi HAYAKAWA ◽  
...  
Keyword(s):  
Ground Motions ◽  
Quantitative Prediction ◽  
Tokyo Bay ◽  
Long Period ◽  
Bay Area ◽  
Tokai Earthquake
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