Microtremor Measurements for the Microzonation of Dinar

2002 ◽  
pp. 2525-2541 ◽  
Author(s):  
Atilla M. Ansal ◽  
Recep Iyisan ◽  
Hamza Güllü
Keyword(s):  
Microtremor Measurements

Microtremor measurements used to map thickness of soft sediments

1999 ◽  
Vol 89 (1) ◽  
pp. 250-259
Author(s):  
Malte Ibs-von Seht ◽  
Jürgen Wohlenberg
Keyword(s):  
Cross Sections ◽  
Vertical Component ◽  
Noise Spectrum ◽  
Main Peak ◽  
Spectral Ratios ◽  
Wide Range ◽  
Noise Measurements ◽  
Cover Thickness ◽  
Microtremor Measurements ◽  
Lower Rhine Embayment

Abstract The observations about the behavior of microtremor spectra presented here show that noise measurements can be used as a powerful tool to determine the thickness of soft cover layers. The most suitable method for this determination is Nakamura's technique, which is the ratio of the horizontal-component noise spectrum and that of the vertical component (H/V spectrum). The frequency of the main peak in these spectral ratios correlates well with the sediment thickness at the site. Using an extensive database of microtremor measurements carried out in the western Lower Rhine Embayment (Germany), it was possible to show that this correlation is clearly valid for a wide range of thickness, namely, from tens of meters to more than 1000 m. A simple formula was derived that, for the sediments to be found in the area investigated, directly calculates the cover thickness from the frequency of the main peak in the H/V spectrum. A comparison with calculated resonant frequencies suggests the relation derived from the noise measurements depending on the velocity depth function of the shear wave. Classical spectral ratios are shown to be strongly influenced by the noise level and are therefore less reliable in determining the resonant frequency of the subsoil. The practical relevance of the investigation is illustrated by means of cross sections, constructed from results of the microtremor analyses, which provide a convincing image of the surficial structure of the areas investigated.

Distribution of ground-motion intensity inferred from questionnaire survey, earthquake recordings, and microtremor measurements—A case study in Christchurch, New Zealand, during the 1994 arthurs pass earthquake

1997 ◽  
Vol 87 (2) ◽  
pp. 356-369
Author(s):  
Takumi Toshinawa ◽  
J. John Taber ◽  
John B. Berrill
Keyword(s):  
New Zealand ◽  
Ground Motion ◽  
Intensity Data ◽  
Amplification Factors ◽  
Areal Distribution ◽  
Local Site ◽  
Geological Conditions ◽  
The City ◽  
Microtremor Measurements

Abstract The areal distribution of seismic ground-motion intensity in the city of Christchurch, New Zealand, during the 1994 Arthurs Pass Earthquake (ML 6.6) was evaluated using an intensity questionnaire together with local site amplifications inferred from seismic recordings and microtremors. In order to estimate the intensity in parts of the city where no intensity data were available, intensity data were compared to relative levels of shaking determined from both weak-motion and microtremor recordings. Weak ground-motion amplification factors were determined using ratios of ground accelerations at five sediment sites with respect to a rock site. Microtremor amplification factors were determined from horizontal-to-vertical spectral ratios at a 1-km spacing throughout the city. A positive correlation between weak-motion and microtremor amplification factors allowed extrapolation of microtremor amplification to estimated MM intensity (EMMI). EMMI ranged from 3 to 6 and was consistent with the questionnaire intensity and geological conditions and showed detailed information on the areal distribution of ground-motion intensity in the city.

scholarly journals Site Effect Estimation Using Microtremor Measurements at New Luxor City Proposed Site, South Egypt*

2021 ◽  
Vol 09 (09) ◽  
pp. 131-149
Author(s):  
Abdelnasser Mohamed ◽  
Sayed Omer El khateeb ◽  
Wael Dosoky ◽  
Mahmoud A. Abbas
Keyword(s):  
Site Effect ◽  
Effect Estimation ◽  
Microtremor Measurements

Microtremor Measurements at Mogao Grottoes, Dunhuang, China for Preliminary Dynamic Characterization for Performance During Earthquake

2014 ◽  
pp. 31-35
Author(s):  
Yoshinori Iwasaki ◽  
Koichi Nakagawa ◽  
Yuzo Ishikawa ◽  
Chikaosa Tanimoto ◽  
Keigo Koizumi ◽  
...  
Keyword(s):  
Dynamic Characterization ◽  
Mogao Grottoes ◽  
Microtremor Measurements

scholarly journals Application of the microtremor measurements to a site effect study

2017 ◽  
Vol 30 (3) ◽  
pp. 157-164 ◽  
Author(s):  
Sadegh Rezaei ◽  
Asskar Janalizadeh Choobbasti
Keyword(s):  
Site Effect ◽  
Effect Study ◽  
A Site ◽  
Microtremor Measurements
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