Simulation of the Seismic Response of 2D Sedimentary Basin with Hybrid PSM/FDM Method

2012 ◽  
Vol 594-597 ◽  
pp. 1840-1848 ◽  
Author(s):  
Wu Jian Yan ◽  
Yan Bin Wang ◽  
Yu Cheng Shi
Keyword(s):  
Ground Motion ◽  
Strong Ground Motion ◽  
Site Response ◽  
Pseudospectral Method ◽  
Peak Displacement ◽  
Wavefield Simulation ◽  
Basin Edge ◽  
Discontinuous Medium ◽  
Seismic Wavefield ◽  
Strong Ground

Abstract: In this paper, we simulated two-dimension numerical on the strong ground motion in Lanzhou basin through the hybrid scheme based on the pseudospectral method (PSM) and finite difference method (FDM). We base on a focal of 20 km deep and a profile of 5 layers is used as model to analyze the site response and the peak displacement of strong ground motion. The results show that the hybrid PSM/FDM method for seismic wavefield simulation combines with advantages of PSM and FDM and makes up for the disadvantage of them, so this method can process well the calculation of the discontinuous medium surface, then the calculation accuracy is similar to PSM. Through the wavefield simulation it is known that the peak ground displacement (PGD) of the vertical is larger and the influence of surface wave at the basin edge is more obvious than the horizontal.

Simulation of the Seismic Response of Two Different Thick Deposition Layers with Hybrid PSM/FDM Method

2013 ◽  
Vol 353-356 ◽  
pp. 1858-1866
Author(s):  
Wu Jian Yan ◽  
Yu Cheng Shi
Keyword(s):  
Finite Difference ◽  
Finite Difference Method ◽  
Ground Motion ◽  
Difference Method ◽  
Strong Ground Motion ◽  
Pseudospectral Method ◽  
Wavefield Simulation ◽  
The Finite Difference Method ◽  
Seismic Wavefield ◽  
Strong Ground

In this paper, we simulated two-dimension numerical on the strong ground motion through the hybrid scheme based on the pseudo-spectral method (PSM) and finite difference method (FDM). We based on the same focal depth, and 2 different thick deposition layers are used as models to analyze the relationship between site situation and the peak displacement of strong ground motion. The results show that the hybrid PSM/FDM method for seismic wavefield simulation combines with advantages of the pseudospectral method and the finite difference method and makes up for the disadvantage of the pseudospectral method and the finite difference method, so this method can process well the calculation of the discontinuous medium surface, then the calculation accuracy is similar to the pseudospectral method. Through the wavefield simulation it is known that the range of the seismic wavefield the peak ground displacement (PGD) of the thicker deposition is larger and the influence of the secondary surface wave at the basin edge is more obvious. The thicker deposition amplitude of strong ground motion in the basin is larger and the duration is longer, and the reflected wave of which is more obvious and stronger. However, the difference of the site condition has little influence to strong ground motion in the horizontal direction.

scholarly journals Prediction and evaluation of nonlinear site response with potentially liquefiable layers in the area of Nafplion (Peloponnesus, Greece) for a repeat of historical earthquakes

2010 ◽  
Vol 10 (11) ◽  
pp. 2281-2304 ◽  
Author(s):  
V. K. Karastathis ◽  
G. A. Papadopoulos ◽  
T. Novikova ◽  
Z. Roumelioti ◽  
P. Karmis ◽  
...  
Keyword(s):  
Ground Motion ◽  
Strong Ground Motion ◽  
Site Response ◽  
Soft Soil ◽  
Soil Layer ◽  
Ground Acceleration ◽  
Nonlinear Site Response ◽  
Strong Ground Motion Simulation ◽  
Scenario Earthquakes ◽  
Strong Ground

Abstract. We examine the possible non-linear behaviour of potentially liquefiable layers at selected sites located within the expansion area of the town of Nafplion, East Peloponnese, Greece. Input motion is computed for three scenario earthquakes, selected on the basis of historical seismicity data, using a stochastic strong ground motion simulation technique, which takes into account the finite dimensions of the earthquake sources. Site-specific ground acceleration synthetics and soil profiles are then used to evaluate the liquefaction potential at the sites of interest. The activation scenario of the Iria fault, which is the closest one to Nafplion (M=6.4), is found to be the most hazardous in terms of liquefaction initiation. In this scenario almost all the examined sites exhibit liquefaction features at depths of 6–12 m. For scenario earthquakes at two more distant seismic sources (Epidaurus fault – M6.3; Xylokastro fault – M6.7) strong ground motion amplification phenomena by the shallow soft soil layer are expected to be observed.

scholarly journals A comparative study of strong ground motion records from the 30 August 2013 south Tibet earthquake on the rock and soil sites of the Kathmandu valley

2016 ◽  
Vol 50 (1) ◽  
pp. 25-30
Author(s):  
Subeg Man Bijukchhen ◽  
Nobuo Takai ◽  
Michiko Shigefuji ◽  
Masayoshi Ichiyanagi ◽  
Tsutomu Sasatani ◽  
...  
Keyword(s):  
Ground Motion ◽  
Strong Ground Motion ◽  
Site Response ◽  
Underground Structure ◽  
Maximum Velocity ◽  
Kathmandu Valley ◽  
Rock Site ◽  
The Difference ◽  
Ground Motion Records ◽  
Strong Ground

The present site response study is based upon strong ground motion records from 4 seismic stations established by the Hokkaido University in the Kathmandu valley at Kirtipur, Tribhuvan University, Patan, and Thimi: one right above the bedrock and others over the lake sediments. We considered the rock-site station in Kirtipur as a reference site to quantify the amplification at sediment sites by analysing the Mb=4.9 Southern Tibet Earthquake of 30 August 2013. The horizontal maximum velocity of 0.84 cm/s is recorded in Thimi in contrast to 0.23 cm/s in Kirtipur. The highest spectral amplitude at sediment sites matches with results from microtremor study. Significant amplification is seen at 0.3-1 Hz band at sediment sites for whole waveform whereas analysis of the S-wave part indicates amplification in the 1-2 Hz band. Surface waves in the records of sediment sites continue for quite a long time compared to that of the rock-site and records of all sites contain Rayleigh waves. Though the difference in azimuth and epicentral distance of the sites are not significant, it is observed that the initial motion at the Kirtipur site is about 0.25 sec earlier than expected. This implies the difference in the underground body wave velocity structure of the sites. But the lack of accurate underground structure of the valley necessitates further study. For future research we will try to discuss the basin underground structure with strong ground motion data including Mb=4.4 Gorkha Earthquake of 25 November 2014 and Mb=5.0 Solukhumbu Earthquake of 18 December 2014.

Nonlinear site response from the strong ground-motion recordings in western China

2016 ◽  
Vol 82 ◽  
pp. 99-110 ◽  
Author(s):  
Mianshui Rong ◽  
Zhenming Wang ◽  
Edward W. Woolery ◽  
Yuejun Lyu ◽  
Xiaojun Li ◽  
...  
Keyword(s):  
Ground Motion ◽  
Strong Ground Motion ◽  
Site Response ◽  
Western China ◽  
Nonlinear Site Response ◽  
Strong Ground
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