Strong-motion earthquake accelerograms digitization and analysis

1978 ◽  
Author(s):  
A. Gerald Brady ◽  
Virgilio Perez
Keyword(s):  
Strong Motion ◽  
Earthquake Accelerograms

scholarly journals Computer processing of New Zealand strong-motion accelerograms

1983 ◽  
Vol 16 (3) ◽  
pp. 234-246
Author(s):  
S. B. Hodder
Keyword(s):  
New Zealand ◽  
Ground Motion ◽  
Strong Ground Motion ◽  
Processing System ◽  
Strong Motion ◽  
Computer Processing ◽  
Band Pass ◽  
New Processing ◽  
Earthquake Accelerograms ◽  
Strong Ground

Recently implemented modifications to the computer processing of earthquake accelerograms are described. The main extensions to the system include dynamic instrument correction, robust band-pass filtering and accurate integration, all implemented in the frequency domain. The processed records now provide accurate representations of strong ground motion within the frequency band from 0.25 Hz to 24.5 Hz: full accuracy is maintained in the computed velocity and displacement signals. The use of the new processing system is demonstrated using two previously recorded accelerograms.

Comparison of some widely-used strong-motion earthquake accelerometers

1971 ◽  
Vol 61 (2) ◽  
pp. 383-397 ◽  
Author(s):  
A. Eisenberg ◽  
T. V. McEvilly
Keyword(s):  
Strong Motion ◽  
Shaking Table ◽  
Response Characteristics ◽  
Expected Performance ◽  
Earthquake Accelerograms

abstract A series of shaking table and tilt tests were conducted with several commonly used strong-motion earthquake accelerographs. Table accelerations up to 0.5 g, both sine waves and recorded earthquake accelerograms, were used to evaluate response characteristics in the 1- to 50-Hz band under strong-motion conditions. All instruments performed within 10 per cent of manufacturers' specifications. No serious parasitic resonances were observed. Timing systems accuracies should be improved for intra-instrument detailed spectral comparisons. The general intuitive feel that mechanical, electronic and recording simplicity are a measure of expected performance for unattended instruments was reinforced by the tests.

scholarly journals A note on the accuracy of computed ground displacements from strong-motion accelerograms

1974 ◽  
Vol 64 (4) ◽  
pp. 1209-1219 ◽  
Author(s):  
M. D. Trifunac ◽  
V. W. Lee
Keyword(s):  
Strong Motion ◽  
Earthquake Accelerograms ◽  
Ground Displacements

abstract In this paper the accuracy of routine methods for processing strong-motion earthquake accelerograms (Trifunac, 1971, 1972; Hudson et al., 1971) has been tested by comparing displacement curves computed from the twice-integrated accelerograph recordings with displacement curves computed from displacement-meter measurements. The displacement meters have transducers with natural periods typically several seconds long. Agreement is found to be very good, suggesting that the methods used for routine processing of strong-motion accelerograms are quite accurate.

scholarly journals Computer analyses of New Zealand earthquake accelerograms - volume I

1982 ◽  
Vol 15 (1) ◽  
pp. 46-47
Author(s):  
J. L. Beck ◽  
P. M. Randal ◽  
R. T. Hefford
Keyword(s):  
New Zealand ◽  
Strong Motion ◽  
Response Spectra ◽  
Fourier Amplitude ◽  
Acceleration Response ◽  
Engineering Seismology ◽  
Amplitude Spectra ◽  
Computer Analyses ◽  
Strong Motion Network ◽  
Earthquake Accelerograms

The Engineering Seismology section of the Physics and Engineering Laboratory, DSIR, has recently published the above volume presenting the results of computer analyses of twenty, three-component, accelerograms recorded by the New Zealand Strong-Motion Network. It contains a brief introduction, three tables summarising the accelerogram characteristics, site information and earthquake information, and the results of the computer analyses. The results presented for each accelerogram begin with a heading page, followed by computer plots of acceleration, velocity and displacement histories, acceleration response spectra and Fourier amplitude spectra. The spectral values are also tabulated.

Evolutionary power spectral density of strong-motion earthquakes

1970 ◽  
Vol 60 (3) ◽  
pp. 891-900 ◽  
Author(s):  
S. C. Liu
Keyword(s):  
Spectral Density ◽  
Power Spectral Density ◽  
Strong Motion ◽  
Earthquake Simulation ◽  
Power Spectral ◽  
Power Spectral Densities ◽  
Frequency Independent ◽  
Peak Location ◽  
The Mean ◽  
Earthquake Accelerograms

Abstract This paper presents the evolutionary (time-dependent) power spectral density curves of six strong-motion earthquakes. The earthquake accelerograms are treated as piecewise-separable and the frequency-independent modulating function is estimated by applying the mean square minimization criterion. The results show that, as the time increases, the power spectral densities of earthquakes can vary both in magnitude and in peak location over the frequency axis. The analysis demonstrates that the nonstationary characteristics of earthquakes can be reasonably assessed by a simple computation procedure and the information thus obtained can be helpful in developing improved stochastic models for earthquake simulation.

Strong-motion earthquake accelerograms at Brawley, California: January 25, 1975

1976 ◽  
Vol 66 (4) ◽  
pp. 1155-1158
Author(s):  
Dennis A. Johnson ◽  
Thomas C. Hanks
Keyword(s):  
Earthquake Swarm ◽  
Strong Motion ◽  
Peak Acceleration ◽  
Earthquake Accelerograms

abstract During the Brawley earthquake swarm of January–February, 1975, a single strong-motion accelerograph installed after the swarm began recorded 27 positively identified earthquakes in 14 hr, at hypocentral distances of approximately 5 km. Eight of these had magnitudes (ML) ≧ 3.5, and several had ML < 2.5; the instrument independently triggered 18 times. Peak accelerations in excess of 10 per cent g were obtained for five of the eight earthquakes with ML ≧ 3.5, and a peak acceleration of 25 per cent g was recorded for the largest event, ML = 4.3.

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