A new baseline correction method for near-fault strong-motion records based on the target final displacement

2018 ◽  
Vol 114 ◽  
pp. 27-37 ◽  
Author(s):  
Yuanzheng Lin ◽  
Zhouhong Zong ◽  
Shizhu Tian ◽  
Jin Lin
Keyword(s):  
Strong Motion ◽  
Correction Method ◽  
Baseline Correction ◽  
Strong Motion Records ◽  
Near Fault

What Is Fling Step? Its Theory, Simulation Method, and Applications to Strong Ground Motion near Surface Fault Ruptures

2021 ◽  
Author(s):  
Yoshiaki Hisada ◽  
Shinya Tanaka
Keyword(s):  
Velocity Structure ◽  
Seismic Velocity ◽  
Strong Motion ◽  
Theoretical Method ◽  
Simulation Method ◽  
Near Surface ◽  
Seismic Velocity Structure ◽  
Strong Motion Records ◽  
Near Fault ◽  
Fling Step

ABSTRACT We present the theory of the fling step and a theoretical method for simulating accurately the near-fault strong motions, and apply it to reproduce various strong-motion records near surface faults. Theoretically, the fling step is the contribution of the static Green’s function in the representation theorem (Hisada and Bielak, 2003), and we show that this theory holds for any seismic velocity structure. We first demonstrate the validity of this theory using theoretical solutions of a circular fault model in a homogeneous full-space. Next, we apply the theory to layered half-spaces, present a theoretical method based on the wavenumber integration method, and introduce various techniques to simulate the near-fault ground motions including fling steps with high accuracy. Finally, we demonstrate the effectiveness of the method by reproducing various strong-motion records near surface fault ruptures and discuss the characteristics of near-fault strong motions including the fling step and the forward directivity pulse. We made all of the software and data used in this article available on the internet.

Development of a New Method of Baseline Correction on Earthquake Strong Motions and Its Application to Long Period Sloshing Responses of Liquid Storage Tanks During Strong Earthquakes

2003 ◽  
Author(s):  
Chikahiro Minowa
Keyword(s):  
Ground Motion ◽  
Low Frequency ◽  
Strong Motion ◽  
Correction Method ◽  
New Method ◽  
Baseline Correction ◽  
Storage Tanks ◽  
Low Frequencies ◽  
Long Period ◽  
Liquid Storage

In this paper, a new method of baseline correction on strong motion acceleration records is presented and the fundamental concept for baseline corrections on the earthquake strong motions is described. Considering the filtering effect, the earthquakes ground motion displacements of 1995 JMA KOBE, 1999 Kocaeli YPT and 1999 Chi-Chi TCU068 are discussed. Also, the linear sloshing responses of large liquid tanks subjected to these motions were discussed. Since liquid storage tanks show the low frequency (long period) sloshing characteristics and the strong motion characteristics of 1999 Kocaeli and Chi-Chi earthquakes are also low frequencies and large permanent displacements, the sloshing responses in large liquid tanks, especially in long natural periods, were significantly affected by the low frequency motions (large permanent displacements) of these devastating earthquakes. It is very important to use suitable ground motion characterized low frequency content for earthquake resistant design of liquid storage tanks. The baseline correction method presented in the paper may be adequately used to correct strong motion records for large liquid storage design.

Baseline Correction Method and Strong Motion in 2003 Off Tokachi

2005 ◽  
Author(s):  
Chikahiro Minowa ◽  
Nobuyoshi Yamaguchi ◽  
Toshio Chiba
Keyword(s):  
Data Processing ◽  
Strong Motion ◽  
Correction Method ◽  
Observation System ◽  
Baseline Correction ◽  
Permanent Displacement ◽  
Geographical Survey Institute ◽  
Processing Procedure ◽  
Displacement Wave ◽  
Data Processing Procedure

Observation system of the seismic wave has greatly progressed and many accelerometers have been set all over Japan. Furthermore, the data processing procedure was developed and the reasonable permanent displacement and the displacement wave were going to be obtained from the measured acceleration data. The baseline correction method was adopted as a data processing procedure. To estimate the adaptability of the baseline correction method, the permanent displacements and displacement wave of major records in 2003 Off Tokachi Earthquake were calculated. The displacements were compared with the data of JAPAN Geographical Survey Institute and Port and Harbor Research Institute. These data were fairly similar to each other. Additionally, sloshing response of the fired large liquid storage tank in Tomakomai was calculated using these data. The baseline correction method presented here can be used successfully to correct strong motion records and present the displacement data for the seismic design and the vibration test.

An Improved Automatic Scheme for Empirical Baseline Correction of Digital Strong-Motion Records

2011 ◽  
Vol 101 (5) ◽  
pp. 2029-2044 ◽  
Author(s):  
R. Wang ◽  
B. Schurr ◽  
C. Milkereit ◽  
Z. Shao ◽  
M. Jin
Keyword(s):  
Strong Motion ◽  
Baseline Correction ◽  
Strong Motion Records

Baseline Correction of Digital Strong-Motion Data-Examples from the 2008 Wenchuan, China, Earthquake

2011 ◽  
Vol 378-379 ◽  
pp. 247-250 ◽  
Author(s):  
Heng Li ◽  
Dun Wang ◽  
Yong Jian Cai ◽  
Jian Chao Wu ◽  
Gang Liu
Keyword(s):  
Ground Motion ◽  
Strong Motion ◽  
Correction Method ◽  
Gps Data ◽  
Main Concern ◽  
Baseline Correction ◽  
Permanent Displacement ◽  
2008 Wenchuan Earthquake ◽  
Motion Data ◽  
Long Period Ground Motion

This paper analyzes key noises within digital strong-motion acceleration recording that can result in baseline offset, and according to their specific position provide a baseline correction scheme for preserving the long-period ground motion. This correction method is then applied to the digital acceleration records from the 2008 Wenchuan earthquake, and also, when compared with GPS data (including some high frequency of 1Hz GPS data), it is shown that this method can well restore displacement of ground motion, including permanent displacement which is the main concern of seismologists. Furthermore, compared with other methods that aim to restore the ground displacement, it has much greater stability.

scholarly journals Baseline correction for digital strong-motion records by using the pre-event portion

2011 ◽  
Vol 2 (1) ◽  
pp. 43-46 ◽  
Author(s):  
Li Heng ◽  
Yao Yunsheng ◽  
Zheng Shuiming ◽  
Cai Yongjian ◽  
Lei Dongning
Keyword(s):  
Strong Motion ◽  
Baseline Correction ◽  
Strong Motion Records

Permanent Displacement Identification Analysis in 2011 Mw9.0 Tohoku Earthquake, Japan

2014 ◽  
Vol 580-583 ◽  
pp. 1533-1537
Author(s):  
Bao Feng Zhou ◽  
Ting Su Song ◽  
Rui Zhi Wen ◽  
Li Li Xie
Keyword(s):  
Ground Motion ◽  
Strong Motion ◽  
Tohoku Earthquake ◽  
Correction Method ◽  
Permanent Displacement ◽  
Baseline Drift ◽  
Near Fault ◽  
Near Fault Ground Motion ◽  
Identification Analysis ◽  
Gps Station

Permanent displacement identification is one of key topics in near-fault ground-motion research. A new method based on Hermit interpolation and flatness technique is proposed to determine permanent displacements, since the Iwan law is not applicable in Mw9.0 Tohoku earthquake permanent displacement recognition. The method is then tested by coseismic displacements resulted from GPS station nearby. Results show that: the causes for strong motion record baseline drift are very complex so that Iwan method is not suitable for permanent displacements identification in the Mw9.0 Tohoku Earthquake, while the new baseline correction method combining Hermit interpolation and flatness technique is suitable for permanent displacement analysis of near-fault ground motion in 2011 Mw9.0 Tohoku Earthquake.

Analysis on the Mechanism for Baseline Drift of near-Fault Accelerograms

2012 ◽  
Vol 166-169 ◽  
pp. 2078-2082
Author(s):  
Yu Shi Wang ◽  
Xiao Jun Li
Keyword(s):  
Seismic Design ◽  
Iterative Process ◽  
Correction Method ◽  
Baseline Correction ◽  
Permanent Displacement ◽  
Ground Shaking ◽  
Baseline Drift ◽  
Seismic Engineering ◽  
Near Fault ◽  
Severe Shock

Accelerograms recorded by accelerographs are of fundamental importance in seismic engineering, forming the basis of ground shaking employed for anti-seismic design. By analysis on the general solution of wave equation, this article demonstrated that the ground tilting is related with the ground velocity and displacement histories. For accelerograms with co-seismic permanent displacement, this ground tilting would be presented continuously with a tiny constant value after severe shock terminated. The co-seismic permanent displacement might be the reason of baseline drift, which caused that the real velocity and displacement histories could not be achieved by the direct integration of accelerograms. A baseline correction method was also proposed based on this finding, with which the ground velocity and displacement histories of several near-fault stations were given. But this proposed method still needed improvement because of the divergence in its iterative process.

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