scholarly journals The damage mechanism of water tower in Shaanxi Provence during Wenchuan Earthquake

2018 ◽  
Vol 175 ◽  
pp. 03026
Author(s):  
Chunfeng Li ◽  
Xuyang Luo ◽  
Rui Duan ◽  
Youliang Shu ◽  
Wangqiang Dai ◽  
...  
Keyword(s):  
Wenchuan Earthquake ◽  
Large Earthquake ◽  
Damage Mechanism ◽  
Period Effect ◽  
2008 Wenchuan Earthquake ◽  
Long Period ◽  
The Wenchuan Earthquake ◽  
Basin Edge ◽  
Weihe Basin ◽  
Long Period Ground Motion

Through the collection, collation and analysis of the data about damage of Water tower in Shaanxi Provence during 12 May 2008 Wenchuan Earthquake, the mechanism of long-period damage of the water tower is given. The analysis shows that, in Hanzhong basin, Ankang basin, and Weihe basin, serious damage should be caused by the long-period effect of basin of large earthquake in the far field. That magnitude of Wenchuan Earthquake is high, three basins are at the direction where the Wenchuan Earthquake wave propagated, and the epicentre is from 400 to 600km determines that the Wenchuan earthquake has the condition producing long-period effect in the three basins. In addition, the basins have very thick deposits, as well as possible basin edge effect may enhance long period damage. The damage of long-period of water tower results from the resonance between water tower and long-period ground motion.

Recent Advances in Gravelly Soils Liquefaction Evaluation

2011 ◽  
Vol 90-93 ◽  
pp. 1443-1446
Author(s):  
Long Qing Hou ◽  
Ai Fei Li ◽  
Hong Mei Xu ◽  
Chun Feng He ◽  
Peng Hu
Keyword(s):  
Wenchuan Earthquake ◽  
Evaluation Method ◽  
Large Diameter ◽  
Penetration Test ◽  
2008 Wenchuan Earthquake ◽  
Moderate Density ◽  
Grain Sizes ◽  
Triaxial Apparatus ◽  
The Wenchuan Earthquake ◽  
Gravelly Soils

Many gravelly soils liquefied cases history especially in the 2008 Wenchuan earthquake warn that loose to moderate density of gravels have much potential to liquefy under a given earthquake shaking. The large diameter triaxial apparatus is a relative feasible means to explore the liquefaction mechanism of gravelly soils to some extent. Becker penetration test (BPT) could be droved hrough gravelly soils layer, but BPT was not directly correlated with field behavior. Because of a wider range of grain sizes than those reported from previous earthquakes, gravels characteristics liquefied in the Wenchuan earthquake are representative and universal. The gravels liquefaction evaluation method developed from the Wenchuan earthquake should be feasible for worldwide use. The recent and ongoing developments in gravels liquefaction was highlighted

scholarly journals Negentropy anomaly analysis of the borehole strain associated with the Ms 8.0 Wenchuan earthquake

2019 ◽  
Author(s):  
Kaiguang Zhu ◽  
Zining Yu ◽  
Chengquan Chi ◽  
Mengxuan Fan ◽  
Kaiyan Li
Keyword(s):  
Wenchuan Earthquake ◽  
Inflection Point ◽  
Large Earthquake ◽  
Earthquake Precursor ◽  
Scale Analysis ◽  
The Wenchuan Earthquake ◽  
Strain Data ◽  
Otsu’S Method ◽  
Anomaly Analysis ◽  
Skewness And Kurtosis

Abstract. A large earthquake of 8.0 magnitude occurred on 12 May 2012, 14:28 UTC, with the epicenter in Wenchuan. To investigate the pre-earthquake anomalous strain changes, negentropy is introduced to borehole strain data at Guza station, approximated by skewness and kurtosis revealing the non-Gaussianity of recorded fluctuations. We separate the negentropy anomalies from the background by Otsu’s method and accumulate the anomaly frequency in different scales. The results show the long-scale cumulative frequency of negentropy anomalies follows a sigmoid behaviour, while the inflection point of the fitting curve is close to the occurrence of the earthquake. For the short-scale analysis before the earthquake, there are two cumulative acceleration phases corresponding to the two crustal stress releases, indicating the preparation process of the Wenchuan earthquake. We consider that negentropy exhibits potential for the analysis of earthquake precursor anomalies.

Analysis on Earthquake Damage of Daxinglu Ramp Bridge in Wenchuan Earthquake

2011 ◽  
Vol 255-260 ◽  
pp. 1003-1006 ◽  
Author(s):  
Guo Hui Zhao ◽  
Yu Min Zhang
Keyword(s):  
Wenchuan Earthquake ◽  
Ground Motion ◽  
Time History ◽  
Element Model ◽  
Natural Period ◽  
Long Period ◽  
Earthquake Record ◽  
Dynamic Time ◽  
Rubber Bearings ◽  
Long Period Ground Motion

Although located in the very low intensity area, the superstructure of Daxinglu Ramp Bridge sustained huge damage in Wenchuan earthquake. The longitudinal displacement of superstructure at the joint was about 400mm, which outdistanced the average displacement of all the other bridges in this area. In this paper, finite element model of the ramp bridge is made by general FEA software and the damage of the ramp bridge is analyzed by using nonlinear dynamic time history method. The results are obtained as follow: (1) the displacements restriction capacity of bearing system is reduced greatly by setting too many movable pot rubber bearings in the bridge. (2) The earthquake record near the bridge site is a typical long period ground motion. The extended natural period of the damaged bridge absorbed more but not less energy from the long period ground motion, which aggravated the damage.

scholarly journals Simulation of long-period ground motion near a large earthquake

1997 ◽  
Vol 87 (1) ◽  
pp. 140-156 ◽  
Author(s):  
Minoru Takeo ◽  
Hiroo Kanamori
Keyword(s):  
Los Angeles ◽  
Ground Motion ◽  
Source Parameters ◽  
Large Earthquake ◽  
Response Spectra ◽  
Model Parameters ◽  
Long Period ◽  
Kanto Earthquake ◽  
Dominant Period ◽  
Long Period Ground Motion

Abstract We estimated the possible range of long-period ground motion for sites located on a soft sedimentary basin in the immediate vicinity of a large earthquake. Since many large cities in the world (e.g., Los Angeles, San Francisco, and Tokyo) where many large structures have been recently constructed are located in this type of environment, a better understanding of long-period ground motion is becoming increasingly important. Our objective is to estimate the possible range of long-period ground motion, rather than ground motion for a specific fault model. We computed ground-motion time series and pseudo-velocity response spectra (PVS) for more than 5,000 models for the 1923 Kanto, Japan, earthquake (MW = 7.9) using 180 slip distributions, eight rupture geometry, and rupture velocities ranging from 1.5 to 3.0 km/sec. Two seismograms recorded in Tokyo during the 1923 Kanto earthquake are used for comparison. The response spectra computed using seismologically reasonable sets of source parameters for the 1923 Kanto earthquake vary by more than an order of magnitude. At periods of 10 to 13 sec, they range from 25 to 170 cm/sec in Tokyo. For some combinations of model parameters, the response spectra exhibit peaks in the range of 10 to 13 sec. Many of the computed response spectra have peaks at periods longer than 10 sec, which is considerably longer than the dominant period (6 to 8 sec) estimated from studies of small earthquakes and microtremor measurements. Thus, the dominant period of the subsurface structure determined locally may not be representative of the dominant period of ground motion from a nearby large earthquake, which is controlled by rupture directivity and source depth. We performed a similar simulation for a hypothetical MW = 7.5 earthquake located beneath the Los Angeles basin. For a site just above the center of the fault, the ground-motion spectral amplitude at a period of 10 sec can vary from 50 to 350 cm/sec. This range, though very large, is what is expected for a seismologically plausible range of source parameters.

scholarly journals Spatiotemporal Evolution of Earthquakes in Longmenshan Fault and Adjacent Area, before and after the 2008 Wenchuan Earthquake

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Gang Fan ◽  
Jun Wang ◽  
Shunchao Qi ◽  
Gongda Lu ◽  
Xingguo Yang ◽  
...  
Keyword(s):  
Wenchuan Earthquake ◽  
Seismogenic Zone ◽  
Adjacent Area ◽  
Spatiotemporal Evolution ◽  
2008 Wenchuan Earthquake ◽  
The 2008 Wenchuan Earthquake ◽  
The Wenchuan Earthquake ◽  
Before And After ◽  
Longmenshan Fault ◽  
International Seismological Centre

Seismicity sequence following a main earthquake usually contains much meaningful information for unveiling the focal mechanism and predicting the reoccurrence interval of large earthquakes. The spatiotemporal evolution of earthquakes before and after the 2008 Wenchuan earthquake (Ms 8.0) is analysed comprehensively in this study. The frequency-magnitude relation of the 3493 earthquake events retrieved from the database of the International Seismological Centre indicates that the adopted catalogue is complete for magnitudes ≥Ms 3.4. The seismicity during the 10 years before the Wenchuan earthquake remained stable, including the magnitudes and focal depths. However, seismicity attenuated sharply in the year following the Wenchuan earthquake, and the magnitude of earthquakes before the Wenchuan earthquake decreased gradually. The area of the seismogenic zone of the 2008 Wenchuan earthquake was smaller than the earthquake stricken area. The earthquakes that occurred in the Longmenshan fault area and adjacent area in the study period were mainly shallow earthquakes. The focal depths of earthquakes in the study area became stable gradually after the Wenchuan earthquake, mainly within the range from 10 to 16 km. The earthquakes in the study area were mainly distributed with an along-dip distance of 0–20 km, and the seismicity was distributed uniformly along the fault strike.

scholarly journals Evaluation of factors controlling large earthquake-induced landslides by the Wenchuan earthquake

2012 ◽  
Vol 12 (12) ◽  
pp. 3645-3657 ◽  
Author(s):  
X. L. Chen ◽  
H. L. Ran ◽  
W. T. Yang
Keyword(s):  
Wenchuan Earthquake ◽  
Hard Rock ◽  
Hanging Wall ◽  
Large Earthquake ◽  
Seismic Intensity ◽  
Surface Rupture ◽  
Critical Acceleration ◽  
2008 Wenchuan Earthquake ◽  
Fault Type ◽  
Narrow Belt

Abstract. During the 12 May 2008, Wenchuan earthquake in China, more than 15 000 landslides were triggered by the earthquake. Among these landslides, there were 112 large landslides generated with a plane area greater than 50 000 m2. These large landslides were markedly distributed closely along the surface rupture zone in a narrow belt and were mainly located on the hanging wall side. More than 85% of the large landslides are presented within the range of 10 km from the rupture. Statistical analysis shows that more than 50% of large landslides occurred in the hard rock and second-hard rock, like migmatized metamorphic rock and carbonate rock, which crop out in the south part of the damaged area with higher elevation and steeper landform in comparison with the northeast part of the damaged area. All large landslides occurred in the region with seismic intensity ≥ X except a few of landslides in the Qingchuan region with seismic intensity IX. Spatially, the large landslides can be centred into four segments, namely the Yingxiu, the Gaochuan, the Beichuan and the Qingchuan segments, from southwest to northeast along the surface rupture. This is in good accordance with coseismic displacements. With the change of fault type from reverse-dominated slip to dextral slip from southwest to northeast, the largest distance between the triggered large landslides and the rupture decreases from 15 km to 5 km. The critical acceleration ac for four typical large landslides in these four different segments were estimated by the Newmark model in this paper. Our results demonstrate that, given the same strength values and slope angles, the characteristics of slope mass are important for slope stability and deeper landslides are less stable than shallower landslides. Comprehensive analysis reveals that the large catastrophic landslides could be specifically tied to a particular geological setting where fault type and geometry change abruptly. This feature may dominate the occurrence of large landslides. The results will be useful for improving reliable assessments of earthquake-induced landslide susceptibility, especially for large landslides which may result in serious damages.

scholarly journals Long-period ground motion effect in Shaanxi Province of Changning Ms6.0 earthquake

2020 ◽  
Vol 198 ◽  
pp. 04002
Author(s):  
Baolai Li ◽  
Fengwen Ren ◽  
Hongwu Feng ◽  
Yunhe Gu ◽  
Chunfeng Li
Keyword(s):  
Wave Propagation ◽  
Ground Motion ◽  
Propagation Distance ◽  
Seismic Wave Propagation ◽  
Shaanxi Province ◽  
Long Period ◽  
Motion Effect ◽  
Weihe Basin ◽  
Long Period Ground Motion

At 22:55 on June 17, 2019, an earthquake of magnitude 6.0 occurred in Shuanghe Town, Changning County, Yibin City, Sichuan Province. In Shaanxi Province, the obvious earthquake sense appeared in some places which are 600 km to 800 km away from the epicenter. Based on the collection, collation and analysis of the data about Weihe Basin, Hanzhong Basin and Ankang Basin in Shaanxi Province, and the analysis of representative seismic network records and seismic wave propagation distance in each basin, the mechanism of the long-period disaster induced by the Changning Ms6.0 earthquake in Shaanxi Province is revealed. This study has a positive significance for the seismic fortification of long-period structures in this area, the scientific popularization of long-term ground motion effect, and the avoidance of earthquake panic.

The Damage in Arch Bridges during 2008 Wenchuan Earthquake

2011 ◽  
Vol 90-93 ◽  
pp. 1597-1601 ◽  
Author(s):  
Yong Huang ◽  
Jun Jie Wang ◽  
Xi Yu Zheng
Keyword(s):  
Wenchuan Earthquake ◽  
Earthquake Damage ◽  
Seismic Zone ◽  
Regular Pattern ◽  
Arch Bridge ◽  
2008 Wenchuan Earthquake ◽  
The Wenchuan Earthquake ◽  
Arch Bridges ◽  
Main Arch

During the Wenchuan earthquake in 2008, many arch bridges in the seismic zone were damaged. The typical damage included: span collapsed, abutment and arch springing cracked, spandrel arch damaged, damage in the joint member between deck and main arch, damage out of arch plane. Some typical damage examples of the arch bridge are introduced in this paper. The causes and regular pattern features of the earthquake damage are analyzed, and the corresponding countermeasures are proposed.

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