A new assessment of errors from digitization and base line corrections of strong-motion accelerograms

1980 ◽  
Vol 70 (1) ◽  
pp. 293-303
Author(s):  
Jafar Shoja-Taheri
Keyword(s):  
Statistical Analysis ◽  
Ground Motion ◽  
Strong Motion ◽  
Base Line ◽  
Strong Motion Records ◽  
Jackknife Method ◽  
Displacement Spectra ◽  
Long Period ◽  
Parkfield Earthquake

abstract Statistical analysis of strong-motion records of the 1966 Parkfield earthquake and the 1952 Taft earthquake indicates that the usable limit of long period of velocity and displacement, calculated by integration of the accelerogram records, is restricted mainly by human reading and base line correction errors. Base line correction errors arise from uncertainties in the coefficients of the fitted straight base line. Calculation by the jackknife method of the variances of the errors in displacement records from linear base line corrections indicates that these errors are more pronounced in the long-period (above 7 sec) range than errors from digitization. The records analyzed in this paper indicate that long-period limits due to the combined errors vary between 7 and 14 sec. Beyond these limits components of displacement spectra from the present analog accelerograms are not reliable measures of ground motion.

scholarly journals RETRACTED ARTICLE: Estimation of the source process and forward simulation of long-period ground motion of the 2018 Hokkaido Eastern Iburi, Japan, earthquake

2019 ◽  
Vol 71 (1) ◽  
Author(s):  
Hisahiko Kubo ◽  
Asako Iwaki ◽  
Wataru Suzuki ◽  
Shin Aoi ◽  
Haruko Sekiguchi
Keyword(s):  
Ground Motion ◽  
Velocity Structure ◽  
Time Window ◽  
Waveform Inversion ◽  
Strong Motion ◽  
Source Model ◽  
Multiple Time ◽  
Velocity Models ◽  
Long Period ◽  
Slip Area

Abstract In this study, we investigate the source rupture process of the 2018 Hokkaido Eastern Iburi earthquake in Japan (MJMA 6.7) and how the ground motion can be reproduced using available source and velocity models. First, we conduct a multiple-time-window kinematic waveform inversion using strong-motion waveforms, which indicates that a large-slip area located at a depth of 25–30 km in the up-dip direction from the hypocenter was caused by a rupture propagating upward 6–12 s after its initiation. Moreover, the high-seismicity area of aftershocks did not overlap with the large-slip area. Subsequently, using the obtained source model and a three-dimensional velocity structure model, we conduct a forward long-period (< 0.5 Hz) ground-motion simulation. The simulation was able to reproduce the overall ground-motion characteristics in the sedimentary layers of the Ishikari Lowland.

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.

A study on amplification response of soil ground motion in Shanghai using strong motion records

2002 ◽  
Vol 15 (6) ◽  
pp. 691-695
Author(s):  
Yong-lin Xu ◽  
Li-jun Xiong ◽  
Chun Zhang ◽  
Zhi-guang Zhao
Keyword(s):  
Ground Motion ◽  
Strong Motion ◽  
Strong Motion Records

Strong Motion Records of the 2011 Tohoku Earthquake and its Attenuation Characteristics

2012 ◽  
Vol 7 (6) ◽  
pp. 693-700 ◽  
Author(s):  
Saburoh Midorikawa ◽  
◽  
Hiroyuki Miura ◽  
Tomohiro Atsumi
Keyword(s):  
Ground Motion ◽  
Strong Motion ◽  
Tohoku Earthquake ◽  
Distribution Model ◽  
Motion Generation ◽  
The 2011 Tohoku Earthquake ◽  
Strong Motion Records ◽  
Attenuation Relationships ◽  
Shortest Distance ◽  
Definition Of

Many strong motion records were obtained during the 2011 Off the Pacific Coast of Tohoku earthquake owing to the implementation of dense strong motion observation in Japan. The earthquake provides an opportunity to examine the characteristics of strong ground motion from a gigantic earthquake. Attenuations of peak acceleration and velocity are examined by comparing them to curves from existing attenuation relationships. When the shortest distance from the fault plane of the slip distribution model is used, curves for Mw8.0 to 8.3 give the smallest deviation from data, suggesting the saturation of ground motion intensity at large magnitudes. When the shortest distance from the strong motion generation areas is used, however, the scattering of data becomes smaller and the curve for Mw9.0 fits acceleration data. Results thus change with the definition of distance. This suggests that a consideration of the rupture heterogeneity is important in strong motion prediction for gigantic earthquakes.

Sign in / Sign up

Export Citation Format

Share Document