Bottom Interaction Effects on Normal Modes: an Algebraic Approach

1986 ◽  
pp. 75-85 ◽  
Author(s):  
David H. Wood ◽  
Mark D. Duston ◽  
Ghasi R. Verma
Keyword(s):  
Normal Modes ◽  
Algebraic Approach ◽  
Interaction Effects

Foam rubber modeling of topographic and Dam interaction effects at Pacoima Dam

1989 ◽  
Vol 79 (5) ◽  
pp. 1347-1360
Author(s):  
Abdolrasool Anooshehpoor ◽  
James N. Brune
Keyword(s):  
Shear Wave ◽  
Wave Velocity ◽  
Shear Wave Velocity ◽  
Free Field ◽  
Normal Modes ◽  
Spectral Ratio ◽  
Interaction Effects ◽  
Ground Acceleration ◽  
Sh Waves ◽  
Foam Rubber

Abstract A study of the topographic and dam interaction effects was made using a 3-D foam rubber model of the actual topography around the Pacoima Dam accelerograph which recorded over 1 g high-frequency horizontal ground accelerations during the 1971 San Fernando earthquake. Scaling of frequency from the model to the earth depends on the average value of shear-wave velocity in the upper few hundred meters. Assuming βe = 2 km/sec, for vertically incident SH waves, the spectral ratio of the ground acceleration on the ridge to the free field (flat surface) indicates an amplification of about 60 per cent around 6.5 Hz on the N76°W component. Topography has little effect upon the motion recorded on the S14°W component. Motion on the ridge is lower than the free-field motion on both horizontal components for frequencies above 9 Hz. Amplification peaks shift to higher or lower frequencies depending on the assumed shear-wave velocity in the upper few hundred meters. Results from nonvertically incident SH waves show that the topographic effect is dependent on the direction of approach of the seismic energy. The effect is either de-amplification (in part by shadowing) or amplification (relative to the case where no topography is present), depending on whether the canyon is on the ray path or not. The Fourier spectrum of the ground motion at the dam crest shows peak frequencies at about 5 Hz and 10 Hz (resonance), which correspond to the normal modes of the dam. A study of dynamic interaction between the Pacoima Dam and the ridge shows that the coupling is less than 2 per cent at about 10 Hz and less than 12 percent at about 5 Hz.

Imageability and Body-Object Interaction Effects in Multisyllabic Word Recognition

2011 ◽  
Author(s):  
Stephen D. R. Bennett ◽  
A. Nicole Burnett ◽  
Paul D. Siakaluk ◽  
Penny M. Pexman
Keyword(s):  
Word Recognition ◽  
Interaction Effects ◽  
Object Interaction

Interaction Effects of Closeness and Anger Toward God on Depression and Life Satisfaction

2012 ◽  
Author(s):  
Sari L. Glazer ◽  
Ann Marie Yali ◽  
Julie J. Exline
Keyword(s):  
Life Satisfaction ◽  
Interaction Effects

Younger, more senior, and most vulnerable? Interaction effects of age and job seniority on psychological distress and quality of life among firefighters.

2021 ◽  
Vol 13 (1) ◽  
pp. 56-65
Author(s):  
Kah Kheng Goh ◽  
Susyan Jou ◽  
Mong-Liang Lu ◽  
Li-Chun Yeh ◽  
Yun-Fan Kao ◽  
...  
Keyword(s):  
Quality Of Life ◽  
Psychological Distress ◽  
Interaction Effects
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