scholarly journals 3-D simulation of near-field strong ground motion: Basin edge effect derived from rupture directivity

1997 ◽  
Vol 24 (8) ◽  
pp. 905-908 ◽  
Author(s):  
Tomohiro Inoue ◽  
Takashi Miyatake
Keyword(s):  
Ground Motion ◽  
Edge Effect ◽  
Strong Ground Motion ◽  
Near Field ◽  
Rupture Directivity ◽  
Basin Edge ◽  
Strong Ground

scholarly journals Near-Field Ground Motion Modal versus Wave Propagation Analysis

2010 ◽  
Vol 17 (4-5) ◽  
pp. 611-617 ◽  
Author(s):  
Artur Cichowicz
Keyword(s):  
Ground Motion ◽  
Strong Ground Motion ◽  
Response Spectrum ◽  
Near Field ◽  
Spectral Characteristics ◽  
Beam Model ◽  
Drift Spectrum ◽  
Localized Deformation ◽  
Dominant Period ◽  
Strong Ground

The response spectrum generally provides a good estimate of the global displacement and acceleration demand of far-field ground motion on a structure. However, it does not provide accurate information on the local shape or internal deformation of the response of the structure. Near-field pulse-like ground motion will propagate through the structure as waves, causing large, localized deformation. Therefore, the response spectrum alone is not a sufficient representation of near-field ground motion features. Results show that the drift-response technique based on a continuous shear-beam model has to be employed here to estimate structure-demand parameters when structure is exposed to the pulse like ground motion. Conduced modeling shows limited applicability of the drift spectrum based on the SDOF approximation. The SDOF drift spectrum approximation can only be applied to structures with smaller natural periods than the dominant period of the ground motion. For periods larger than the dominant period of ground motion the SDOF drift spectra model significantly underestimates maximum deformation. Strong pulse-type motions are observed in the near-source region of large earthquakes; however, there is a lack of waveforms collected from small earthquakes at very close distances that were recorded underground in mines. The results presented in this paper are relevant for structures with a height of a few meters, placed in an underground excavation. The strong ground motion sensors recorded mine-induced earthquakes in a deep gold mine, South Africa. The strongest monitored horizontal ground motion was caused by an event of magnitude 2 at a distance of 90 m with PGA 123 m/s2, causing drifts of 0.25%–0.35%. The weak underground motion has spectral characteristics similar to the strong ground motion observed on the earth's surface; the drift spectrum has a maximum value less than 0.02%.

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.

An Improved Source Model for Simulation Near-Field Strong Ground Motion Acceleration Time History

2013 ◽  
Vol 438-439 ◽  
pp. 1474-1480
Author(s):  
Ju Fang Zhong ◽  
Long Wei Zhang ◽  
Jun Wei Liang
Keyword(s):  
Ground Motion ◽  
Strong Ground Motion ◽  
Response Spectrum ◽  
Near Field ◽  
Time History ◽  
Source Spectrum ◽  
Acceleration Time ◽  
Acceleration Time History ◽  
Spectrum Model ◽  
Strong Ground

The key to near-field strong ground motion simulation based on stochastic finite fault method is to determine the spectrum of ground motion. We present an improved source spectrum model for simulation near-field strong ground motion acceleration time history. We combine Masudas source spectrum model with scaling factor Hij to keep radiation energy conservation and reflect the energy decrease with frequency at low to mid frequencies. We calculate the Fourier amplitude spectrum Fa, accelerate response spectrum Sa, velocity response spectrum Sv and displacement response spectrum Sd of simulation time histories. By comparative analysis of the laws of spectrum values (Fa, Sa, Sv, Sd) with the variation of frequency or period, we discusses the effects of sub-fault dividing scheme, the method of determining scale factor and source spectrum model on spectrum values (Fa, Sa, Sv, Sd). The results show that sub-fault dividing scheme has slightly effect on the model presented in this paper, and the model enable to reflect the sink laws of source spectrum value in mid-to-low frequencies well. We demonstrate that the improved model is superior to other commonly used models.

scholarly journals Rupture directivity effect on strong ground motion during the 12 May 2008 MW7.9 Wenchuan earthquake

2021 ◽  
Vol 34 (0) ◽  
pp. 1-16
Author(s):  
Zhao An ◽  
◽  
Jun-Ju Xie ◽  
Yong Zhang ◽  
Xiao-Jun Li ◽  
...  
Keyword(s):  
Wenchuan Earthquake ◽  
Ground Motion ◽  
Strong Ground Motion ◽  
Rupture Directivity ◽  
Directivity Effect ◽  
Strong Ground

A method for synthesizing realistic strong ground motion

1971 ◽  
Vol 61 (6) ◽  
pp. 1739-1753 ◽  
Author(s):  
Mihailo D. Trifunac
Keyword(s):  
Ground Motion ◽  
Strong Ground Motion ◽  
Group Velocity Dispersion ◽  
Near Field ◽  
New Method ◽  
Release Mechanism ◽  
Low Velocity ◽  
Local Geology ◽  
Artificial Accelerograms ◽  
Strong Ground

abstract A new method of synthesizing artificial accelerograms, based on knowledge of the temporal and spatial properties of the energy-release mechanism, incorporates the effects of local geology through theoretical group-velocity dispersion data for a given site. It is assumed that most of the near-field strong ground motion caused by shallow or surface faulting or explosions is represented by energy propagating through the low-velocity surface-wave guide. The new method of generating artificial accelerograms realistically models strong ground motion for applied structural analysis and theoretical investigations of the response of hysteretic-type structures, soil-structure interaction, and statistics of failure.

Rupture Directivity During the September 7, 1999 ( M w 5.9) Athens (Greece) Earthquake Inferred from Forward Modeling of Strong Ground Motion

2003 ◽  
Vol 160 (12) ◽  
pp. 2301-2318 ◽  
Author(s):  
Z. Roumelioti ◽  
A. Kiratzi ◽  
N. Theodoulidis ◽  
I. Kalogeras ◽  
G. Stavrakakis
Keyword(s):  
Ground Motion ◽  
Strong Ground Motion ◽  
Forward Modeling ◽  
Rupture Directivity ◽  
Strong Ground
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