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.

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.

scholarly journals ACCELERATION RESPONSE SPECTRUM AND EFFECTIVE DURATION OF LEBAK EARTHQUAKE JANUARY 23, 2018 IN JAKARTA REGION

2019 ◽  
Vol 4 (1) ◽  
pp. 21-30
Author(s):  
Muhammad Fikri Hayqal Hiola ◽  
Bambang Sunardi
Keyword(s):  
Response Spectrum ◽  
Capital City ◽  
Acceleration Response ◽  
South Indian ◽  
Significant Acceleration ◽  
Acceleration Data ◽  
Statistical Analysis Method ◽  
Acceleration Response Spectrum ◽  
Motion Characteristics ◽  
Very High

Jakarta is the capital city of Indonesia with a very high population density low to the upper distribution of buildings which causes many areas of Jakarta to have a high vulnerability to natural disasters, one of which is an earthquake. One of the earthquakes felt this year was Lebak Banten Earthquake January 23, 2018, with a magnitude 6.1 at 13.34 local time. The depth of the earthquake was 61 Km at -7.09o S - 106.03o E, in the South Indian Ocean of Java Island. The epicenter was 43 km from Cilangkahan Village, Malingping Sub-district, Lebak District, Banten. We analyze the ground motion characteristics in the Jakarta area using 3 component acceleration data at Jakarta City Hall Office (JAKO) and Tanjung Priok Maritime Station (JATA) with dynamic statistical analysis method. The effective duration and earthquake response spectrum are determined using the acceleration data. In this study, the active period of the earthquake was calculated using the Trifunac and Brady method. The results of the analysis show that the most significant acceleration spectrum at JAKO station is found in component E of 0.07742 g in the period of 0.54 s while for the most significant acceleration spectrum JATA station found in component N of 0.04572 g in the period of 0.58 s. The effective duration obtained at JAKO stations was 56.76 s and JATA station 63.47 s. These results indicate that in the case of the Lebak earthquake, the further region from the epicenter of the earthquake has an effective duration which is relatively longer.

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.

Vertical Isolation Research of Rubber Bearing in Series with Disk Spring

2012 ◽  
Vol 166-169 ◽  
pp. 367-370
Author(s):  
Qiang Rong ◽  
Yan Sheng
Keyword(s):  
Ground Motion ◽  
Mechanical Model ◽  
Base Isolation ◽  
Isolation Layer ◽  
Vertical Ground Motion ◽  
Rubber Bearing ◽  
Disk Spring ◽  
In Series ◽  
Vertical Ground ◽  
Horizontal Ground Motion

The isolation of horizontal ground motion is usually considered in the base isolation. However, the influence of vertical ground motion is not enough considered. The rubber isolation bearings install in series disk spring. The isolation layer parameters and the corresponding mechanical model are proposed. The vertical isolation effect of the new system is remarkable by analyzing example.

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