scholarly journals Multisource Ground Motion Attenuation Relationship Model for the Vertical Component of the Wenchuan Earthquake on May 12, 2008

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Ping Liu ◽  
Tongjie Ren ◽  
Hai Wang ◽  
Chunfeng Li ◽  
Baoqiang Wang ◽  
...  
Keyword(s):  
Wenchuan Earthquake ◽  
Ground Motion ◽  
Response Spectrum ◽  
Site Effect ◽  
Source Model ◽  
Attenuation Relationship ◽  
Ground Motion Attenuation ◽  
Vertical Ground Motion ◽  
The Wenchuan Earthquake ◽  
Vertical Ground

In order to extend the multisource model to vertical ground motion, we fit the vertical ground motion attenuation relationship of the Wenchuan earthquake. Different from traditional attenuation relationship forms, we propose a simplified ground motion attenuation function including site effect via a flag related to VS30. The regression results show that it has site effect on the vertical ground motion of the Wenchuan earthquake and gradually weakens with the increase in periods. According to residuals analysis, the hanging-wall effect on vertical ground motion is strong for the Wenchuan earthquake, especially in short periods. The result analysis indicates that the shape of the vertical response spectrum based on regression is different from that of the horizontal component and complies with the recommended design vertical response spectrum of FEMA P-1050. V/H (vertical-to-horizontal ratios), as a main way to estimate vertical ground motion, cannot be simply fixed as 2/3. Therefore, site location, site condition, and frequency spectrum have to be considered comprehensively. The regression accuracy of the vertical ground motion of the multisource model is slightly higher than that of the point-source model and lower than that of the finite fault source model. It is expected that this model will serve as an alternative for source-to-site distance when multiple asperities are to be modeled in the absence of the detail fault model to get a general scenario of the future ground motions.

Vertical Ground Motion Characteristics of Wenchuan Earthquake

2011 ◽  
Vol 94-96 ◽  
pp. 1828-1832
Author(s):  
Jian Ping Han ◽  
Qing Yan ◽  
Wei Zhou
Keyword(s):  
Wenchuan Earthquake ◽  
Ground Motion ◽  
Epicentral Distance ◽  
Response Spectrum ◽  
Acceleration Response ◽  
Vertical Ground Motion ◽  
Vertical Ground ◽  
Acceleration Response Spectrum ◽  
Horizontal Ground Motion ◽  
Motion Characteristics

The Wenchuan earthquake of May 12, 2008(Mw=8.0) was the most significant earthquake that had affected Chinese Mainland since the Tangshan earthquake of 1976. The dense network of seismographs deployed in this region recorded ground motion acceleration data with good quality. In this paper, vertical ground motion characteristics of Wenchuan Earthquake are investigated from the database including 282 records at 94 stations. Special attention is focused on the behavior of the recorded vertical ground motion and its relation to the horizontal ground motion counterparts. The results indicate that the average value of the ratios of vertical to horizontal peak ground acceleration (av/ah) is 0.58, but the ratios of over 30% stations exceed the rule-of-thumb value of 2/3. This av/ah is much discrete in the near-fault region and tends to decrease with the increase of epicentral distance. Furthermore, site condition also influences this ratio. The curve of vertical to horizontal acceleration response spectral ratio (Sav/Sah) with period ranging from 0 to 6s appears to be saddle-shaped overall and Sav/Sah value varies within different period range. It is also can be seen that the vertical acceleration response spectrum (Sav) looks thin compared with the horizontal acceleration response spectrum (Sah). Except several stations, the ratio of vertical to horizontal ground motion predominant period (Tpv/ Tph) is less than 1.0, and it increases with the increase of epicentral distance and becomes smooth gradually.

Comparative Analysis of the Influence of Slope Terrain on Characteristics of Horizontal and Vertical Ground Motion Response Spectrum

2012 ◽  
Vol 446-449 ◽  
pp. 2279-2284
Author(s):  
Li Ping Wang ◽  
Yao Zhao
Keyword(s):  
Ground Motion ◽  
Response Spectrum ◽  
Spectral Ratio ◽  
Earthquake Damage ◽  
Building Structures ◽  
Element Analysis ◽  
Motion Response ◽  
Vertical Ground Motion ◽  
Vertical Ground ◽  
Elastic Responses

All previous earthquake damage show earthquake damage of the buildings on the slope is serious than the buildings on flat ground, so it is important to analyze of the influence of slope terrain on characteristics of horizontal and vertical ground motion response spectrum. The horizontal and vertical seismic elastic responses of 28 viscoelastic rocky slopes by white noises excited, with height of 10m to70m and slope of 15°to 60°, are calculated by numerical finite element analysis method. The influence laws of height and degree of slope on horizontal and vertical ground motion response spectrum and response spectral ratio are analyzed. The distribution laws of the corresponding period of the maximum of response spectral ratios are contrasted. The maximum of amplification factor of design horizontal and vertical ground motion for structures on rock slopes are given to be the references to code for seismic design of building structures.

The Influence of Stress Drop on Synthesized Ground Motion

2013 ◽  
Vol 477-478 ◽  
pp. 1064-1068
Author(s):  
Xia Xin Tao ◽  
Hai Ming Liu
Keyword(s):  
Wenchuan Earthquake ◽  
Ground Motion ◽  
Stress Drop ◽  
Response Spectra ◽  
Source Model ◽  
Acceleration Time ◽  
The Wenchuan Earthquake ◽  
Acceleration Time Histories ◽  
Time Histories ◽  
The Way

The stress drop during a earthquake is deal with by many papers, but has not been estimated very well yet at present. In order to study its influence on synthesized motion, the motions at two rock sites where records were obtained during the Wenchuan earthquake are synthesized by a hybrid source model from two stress drop values, 30 bar and 85 bars respectively. The result shows that the acceleration time histories, response spectra and mean peak values of motions from 85 bar are comparable to the records, but those of motions from 30 bar are much smaller than the records. It means that the way to inverse the regional parameters simultaneously from regional small quake records is acceptable.

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