scholarly journals Improvement of Method for Estimation of Site Amplification Factor Based on Average Shear-wave Velocity of Ground

2011 ◽  
Vol 11 (3) ◽  
pp. 85-101 ◽  
Author(s):  
Makoto YAMAGUCHI ◽  
Saburoh MIDORIKAWA
Keyword(s):  
Shear Wave ◽  
Wave Velocity ◽  
Shear Wave Velocity ◽  
Amplification Factor ◽  
Site Amplification ◽  
Average Shear ◽  
Site Amplification Factor

scholarly journals Nonlinear Site Amplification as Function of 30 m Shear Wave Velocity

2005 ◽  
Vol 21 (1) ◽  
pp. 1-30 ◽  
Author(s):  
Yoojoong Choi ◽  
Jonathan P. Stewart
Keyword(s):  
Shear Wave ◽  
Wave Velocity ◽  
Shear Wave Velocity ◽  
Active Regions ◽  
Site Amplification ◽  
Site Factors ◽  
Empirical Relationships ◽  
Amplification Factors ◽  
Attenuation Relationships ◽  
Average Shear

We develop empirical relationships to predict nonlinear (i.e., amplitude-dependant) amplification factors for 5% damped response spectral acceleration as a continuous function of average shear wave velocity in the upper 30 m, Vs-30. We evaluate amplification factors as residuals between spectral accelerations from recordings and modified rock attenuation relationships for active regions. Amplification at low- and mid-periods is shown to increase with decreasing Vs-30 and to exhibit nonlinearity that is dependent on Vs-30. The degree of nonlinearity is large for NEHRP Category E (Vs-30<180 m/s) but decreases rapidly with Vs-30, and is small for Vs-30>∼300 m/s. The results can be used as Vs-30-based site factors with attenuation relationships. The results also provide an independent check of site factors published in the NEHRP Provisions, and apparent bias in some of the existing NEHRP factors is identified. Moreover, the results provide evidence that data dispersion is dependent on Vs-30.

scholarly journals AVERAGE SHEAR-WAVE VELOCITY MAPPING USING JAPAN ENGINEERING GEOMORPHOLOGIC CLASSIFICATION MAP

2006 ◽  
Vol 23 (1) ◽  
pp. 57s-68s ◽  
Author(s):  
Masashi MATSUOKA ◽  
Kazue WAKAMATSU ◽  
Kazuo FUJIMOTO ◽  
Saburoh MIDORIKAWA
Keyword(s):  
Shear Wave ◽  
Wave Velocity ◽  
Shear Wave Velocity ◽  
Velocity Mapping ◽  
Average Shear

scholarly journals A Comparative Study on the VS30 and N30 Based Seismic Site Classification in Kahramanmaras, Turkey

2020 ◽  
Vol 2020 ◽  
pp. 1-15
Author(s):  
Dalia Munaff Naji ◽  
Muge K. Akin ◽  
Ali Firat Cabalar
Keyword(s):  
Shear Wave ◽  
Wave Velocity ◽  
Shear Wave Velocity ◽  
Soil Structure ◽  
Site Response ◽  
Dead Sea ◽  
Site Classification ◽  
Earthquake Hazards ◽  
Class D ◽  
Average Shear

Assessment of seismic site classification (SSC) using either the average shear wave velocity (VS30) or the average SPT-N values (N30) for upper 30 m in soils is the simplest method to carry out various studies including site response and soil-structure interactions. Either the VS30- or the N30-based SSC maps designed according to the National Earthquake Hazards Reduction Program (NEHRP) classification system are effectively used to predict possible locations for future seismic events. The main goal of this study is to generate maps using the Geographic Information System (GIS) for the SSC in Kahramanmaras city, influenced by both East Anatolian Fault and Dead Sea Fault Zones, using both VS30 and N30 values. The study also presents a series of GIS maps produced using the shear wave velocity (VS) and SPT-N values at the depths of 5 m, 10 m, 15 m, 20 m, and 25 m. Furthermore, the study estimates the bed rock level and generates the SSC maps for the average VS values through overburden soils by using the NEHRP system. The VS30 maps categorize the study area mainly under class C and limited number of areas under classes B and D, whereas the N30 maps classify the study area mainly under class D. Both maps indicate that the soil classes in the study area are different to a high extent. Eventually, the GIS maps complied for the purpose of urban development may be utilized effectively by engineers in the field.

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