scholarly journals REVIEW OF FAULT MODELS FOR REPRODUCING AND PREDICTING STRONG GROUND MOTIONS AND PERMANENT DISPLACEMENTS

2021 ◽  
Vol 86 (789) ◽  
pp. 1495-1506
Author(s):  
Kazuo DAN
Keyword(s):  
Ground Motions ◽  
Fault Models ◽  
Strong Ground Motions ◽  
Strong Ground

Estimation of strong ground motions in meizoseismal region of the 1976 Tangshan, China, earthquake

1993 ◽  
Vol 83 (6) ◽  
pp. 1756-1777
Author(s):  
K. Dan ◽  
T. Ishii ◽  
M. Ebihara
Keyword(s):  
Earthquake Engineering ◽  
Ground Motions ◽  
Vertical Acceleration ◽  
Fault Models ◽  
Strong Ground Motions ◽  
Horizontal Acceleration ◽  
China Earthquake ◽  
Property Losses ◽  
Largest Aftershock ◽  
Strong Ground

Abstract The 1976 Tangshan, China, earthquake of MS 7.8 killed 242,000 persons, seriously injured 164,000 persons, and caused direct property losses totaling 8 billion Yuan Ren Min Bi (US $4.3 billion). Few investigations have been performed to estimate the characteristics of the strong ground motions in the meizoseismal region of this earthquake using either seismological or earthquake engineering approaches. In this paper, the observed far-field accelerograms of the mainshock are simulated by using the records of the second largest aftershock of MS 6.9 as Green's functions in order to obtain appropriate fault models for the mainshock. The strong ground motions in the meizoseismal region of the mainshock are then estimated by using these fault models and the records of several aftershocks with a magnitude of about 5 which were observed at temporary stations in the damaged area. The results indicate that large horizontal acceleration responses over 1000 cm/sec2 and vertical acceleration responses over 2000 cm/sec2 acted on the structures with natural periods shorter than 0.1 sec in the wide meizoseismal region having a length of 90 km.

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.

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