Simulation on seismogenic environment of strong earthquakes in Sichuan-Yunnan region, China

2009 ◽  
Vol 22 (12) ◽  
pp. 1626-1643 ◽  
Author(s):  
Hong-Sheng Ma ◽  
Yong Zheng ◽  
Zhi-Gang Shao ◽  
Chang-Sheng Jiang ◽  
Long-Quan Zhou ◽  
...  
Keyword(s):  
Strong Earthquakes ◽  
Yunnan Region ◽  
Seismogenic Environment

Seismogenic structures in western Yunnan revealed by three-dimensional magnetotelluric imaging

2020 ◽  
Author(s):  
Qinghua Huang ◽  
Tao Ye ◽  
Xiaobin Chen
Keyword(s):  
Three Dimensional ◽  
Magnetotelluric Data ◽  
Block Boundary ◽  
Strong Earthquakes ◽  
Yunnan Region ◽  
Continental Block ◽  
Western Yunnan ◽  
Resistivity Model ◽  
Seismogenic Structures ◽  
Magnetotelluric Imaging

<p>Influenced by the extrusion of Tibetan blocks and Indo-Burmese collision, the region in western Yunnan is associated with active seismicity and Quaternary volcanoes. Based on broadband magnetotelluric data collected in western Yunnan, we obtain a three-dimensional crustal electrical resistivity model after various data processing and three-dimensional inversion test. The above resistivity model reveals the seismogenic structures of the moderate and strong earthquakes in this tectonic region. We investigate the possible relationship between the seismicity and the electrical structure in western Yunnan region. The results indicate that earthquakes in this region tend to occur in the transition zone between the resistive and conductive structures. Our results also show that one resistive body imaged at the mid-lower crust may have blocked the previously proposed crustal channel flow along this intra-continental block boundary to the east of Tibetan Plateau. Our resistivity model suggests a bifurcation of the crustal flow in western Yunnan. This bifurcated crustal flow structure may play an important dynamical role in the seismogenesis of the earthquakes in western Yunnan.</p>

Deep medium environment of strong earthquakes occurrence in Yunnan region

1999 ◽  
Vol 12 (3) ◽  
pp. 345-356 ◽  
Author(s):  
You-Jin Su ◽  
Zhu-Yin Liu ◽  
Min-Jun Cai ◽  
Jun-Wei Zhang ◽  
Zhong-Hua Li
Keyword(s):  
Strong Earthquakes ◽  
Yunnan Region

Seismoinospheric variations during strong earthquakes on the example of the earthquake of 2010 in Chile

2018 ◽  
pp. 283-292
Author(s):  
M. Gaponova ◽  
◽  
V. Smirnov ◽  
E. Smirnova ◽  
M. Tsidilina ◽  
...  
Keyword(s):  
Strong Earthquakes

scholarly journals Probabilistic seismic response analysis of coastal highway bridges under scour and liquefaction conditions: does the hydrodynamic effect matter?

2020 ◽  
Vol 1 (1) ◽  
Author(s):  
Xiaowei Wang ◽  
Yutao Pang ◽  
Aijun Ye
Keyword(s):  
Seismic Response ◽  
Seismic Design ◽  
Highway Bridges ◽  
Element Model ◽  
Response Analysis ◽  
Hydrodynamic Effect ◽  
Strong Earthquakes ◽  
Influence Of Water ◽  
Scour Hazard ◽  
Ground Motion Records

AbstractCoastal highway bridges are usually supported by pile foundations that are submerged in water and embedded into saturated soils. Such sites have been reported susceptible to scour hazard and probably liquefied under strong earthquakes. Existing studies on seismic response analyses of such bridges often ignore the influence of water-induced hydrodynamic effect. This study assesses quantitative impacts of the hydrodynamic effect on seismic responses of coastal highway bridges under scour and liquefaction potential in a probabilistic manner. A coupled soil-bridge finite element model that represents typical coastal highway bridges is excited by two sets of ground motion records that represent two seismic design levels (i.e., low versus high in terms of 10%-50 years versus 2%-50 years). Modeled by the added mass method, the hydrodynamic effect on responses of bridge key components including the bearing deformation, column curvature, and pile curvature is systematically quantified for scenarios with and without liquefaction across different scour depths. It is found that the influence of hydrodynamic effect becomes more noticeable with the increase of scour depths. Nevertheless, it has minor influence on the bearing deformation and column curvature (i.e., percentage changes of the responses are within 5%), regardless of the liquefiable or nonliquefiable scenario under the low or high seismic design level. As for the pile curvature, the hydrodynamic effect under the low seismic design level may remarkably increase the response by as large as 15%–20%, whereas under the high seismic design level, it has ignorable influence on the pile curvature.

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