Spectral centroid ground motion amplitude anomaly before the Ms 8.0 Wenchuan earthquake

2020 ◽  
Vol 13 (10) ◽  
Author(s):  
Kang Sheng Xu
Keyword(s):  
Wenchuan Earthquake ◽  
Ground Motion ◽  
Spectral Centroid ◽  
Amplitude Anomaly ◽  
Motion Amplitude

Finite Fault Modelling for the Wenchuan Earthquake Using Hybrid Slip Model with Truncated Normal Distributed Source Parameters

2012 ◽  
Vol 256-259 ◽  
pp. 2161-2167 ◽  
Author(s):  
Xiao Dan Sun ◽  
Xia Xin Tao ◽  
Cheng Qing Liu
Keyword(s):  
Wenchuan Earthquake ◽  
Ground Motion ◽  
Source Parameters ◽  
Field Investigation ◽  
Local Source ◽  
Slip Model ◽  
Fault Models ◽  
Average Spectrum ◽  
Finite Fault ◽  
Truncated Normal

An hybrid slip model combining asperity model and k square model was outlined. In the model, both the global and local source parameters follow a trancated normal distribution. The hybrid slip model was then applied to generate finite fault models for the great Wenchuan earthquake, where the fault plane was assumed to have two segments, a reverse segment on the southwestern of the fault and a right-lateral strike-slip segment on the northeastern of the fault. The location of the asperities on each segment was determined considering the results from inversion and field investigation. 30 different finite fault models were obtained, and the one which generates the ground motion best fitting the average spectrum was picked out using spectral deviation evaluation. Finally, ground motion at six near field stations were simualted based on the best-fit fault model and compared to the records.

The Case for Using Mean Seismic Hazard

2005 ◽  
Vol 21 (3) ◽  
pp. 879-886 ◽  
Author(s):  
Robin K. McGuire ◽  
C. Allin Cornell ◽  
Gabriel R. Toro
Keyword(s):  
Decision Making ◽  
Seismic Hazard ◽  
Ground Motion ◽  
Cost Benefit Analysis ◽  
Cost Benefit ◽  
Probabilistic Seismic Hazard ◽  
Benefit Analysis ◽  
Annual Frequency ◽  
The Mean ◽  
Motion Amplitude

Complete probabilistic seismic hazard analyses incorporate epistemic uncertainties in assumptions, models, and parameters, and lead to a distribution of annual frequency of exceedance versus ground motion amplitude (the “seismic hazard”). For decision making, if a single representation of the seismic hazard is required, it is always preferable to use the mean of this distribution, rather than some other representation, such as a particular fractile. Use of the mean is consistent with modern interpretations of probability and with precedents of safety goals and cost-benefit analysis.

Performance of a Rigid Frame Arch Bridge under Near-Fault Earthquake Ground Motion

2011 ◽  
Vol 250-253 ◽  
pp. 1869-1872 ◽  
Author(s):  
Yong Huang ◽  
Jun Jie Wang ◽  
De Yin Jin
Keyword(s):  
Wenchuan Earthquake ◽  
Ground Motion ◽  
Strong Ground Motion ◽  
Earthquake Ground Motion ◽  
Weak Links ◽  
Response Analysis ◽  
Arch Bridge ◽  
2008 Wenchuan Earthquake ◽  
Rigid Frame ◽  
Strong Ground

During May 12th 2008 Wenchuan earthquake with the magnitude of 8.0, a 4-span rigid frame arch bridge named as Xiaoyudong Bridge which situated close to the epicenter was hit by strong ground motion and was severely damaged. The earthquake response analysis of the bridge was made using FE software MIDAS based on recorded ground motion during the Wenchuan earthquake in this paper. The study showed that the main and minor arch legs on the both ends piers were weak links which may be damaged firstly under strong ground motion. The next damage at the pier with weakest horizontal stiffness is one of the important reasons causing the bridge collapsed. This paper will introduce our work on those respects and some drawn conclusions.

Sign in / Sign up

Export Citation Format

Share Document