Establishment of the correlation between the near-surface sedimentary thickness and the microtremor dominant frequency in the Hanoi area

IF 2.4 Q2 GEOSCIENCES, MULTIDISCIPLINARY VIETNAM JOURNAL OF EARTH SCIENCES Pub Date : 2022-10-10 DOI:10.15625/2615-9783/17569
Hung Nguyen-Tien, P. Nguyen-Hong, Minh-Tri Nguyen-Le, L. Che-Min, Nguyen Tran-An, Truyen Pham-The, Duong Nguyen-Van
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Abstract

 This paper established the correlation between the near-surface sedimentary thickness (D) and the microtremor dominant frequency (F0) in the Hanoi area based on 64 microtremor measuring points at the boreholes with depth to bedrock. The microtremor dominant frequency was determined using the horizontal-to-vertical (H/V) spectral ratio of the seismic noise technique proposed by Nakamura (1989). The near-surface sedimentary thickness was determined according to the borehole data from the previously published reports. The non-linear regression method was applied to the pairs of D and F0 values from 64 boreholes to obtain the relationship of form D = 81.851*F0-0.942. This correlation function was used to determine the values of the near-surface sedimentary thickness at microtremor measurement points according to the F0 values. Comparison of the D-values obtained in this study with those from the boreholes data shows good coincidence by values and variation tendency, especially in areas with shallow cover thickness from 50 to 100 m. The above results allow the proposal of a new near-surface sedimentary thickness determination technique in the Hanoi area.
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河内地区近地表沉积厚度与微地震主频关系的建立
本文基于距基岩较深钻孔的64个微地震测点,建立了河内地区近地表沉积厚度(D)与微地震主频(F0)之间的相关性。使用Nakamura(1989)提出的地震噪声技术的水平与垂直(H/V)频谱比来确定微地震主频。近地表沉积厚度是根据先前发表的报告中的钻孔数据确定的。将非线性回归方法应用于64个钻孔的D和F0值对,得到D=81.851*F0-0.942的关系。该相关函数用于根据F0值确定微地震测量点的近地表沉积厚度值。本研究中获得的D值与钻孔数据的D值的比较表明,这些值和变化趋势具有良好的一致性,尤其是在浅覆盖层厚度为50至100 m的地区。上述结果为河内地区提出一种新的近地表沉积厚度测定技术提供了依据。
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来源期刊
VIETNAM JOURNAL OF EARTH SCIENCES
VIETNAM JOURNAL OF EARTH SCIENCES GEOSCIENCES, MULTIDISCIPLINARY-
CiteScore
3.60
自引率
20.00%
发文量
0
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