Characteristics of long-period microtremors and their applicability in exploration of deep sedimentary layers

Yamanaka, Hiroaki; Takemura, Masashi; Ishida, Hiroshi; Niwa, Masanori

doi:10.1785/bssa0840061831

Cited by 167 publications

(15 citation statements)

References 12 publications

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“…with a period of more than 2 seconds), and short-term microtremor (caused by human activities such as traffic, machinery, etc. with periods under 2 seconds) (Yamanaka et al, 1994). The comparison of the H/V component microtremor signal resulted in the dominant frequency and amplification parameters.…”

Section: Microtremor Data Processingmentioning

confidence: 95%

Soil Vulnerability Levels based on Microtremor Data using the HVSR method in the Old City Area of Semarang

Supriyadi

Muttaqin

Khumaedi

et al. 2022

J. Phys.: Theor. Appl.

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<p class="AbstractEnglish">Kota Lama Semarang with the Dutch colonial era relics is currently used as a cultural heritage tourist spot. As a cultural heritage tourism place, it is necessarily aware of the potential for earthquake disasters due to active faults and volcanic eruptions, as well as the phenomenon of land subsidence caused by geological conditions of young alluvium. One of the geophysical techniques to determine subsurface structure is microtremor measurement. This study aims to determine vulnerability level based on dominant frequency, amplification, and seismic vulnerability index using HVSR analysis in Kota Lama area. Microtremor data measurement contained 11 points with a data retrieval duration of 30 minutes. The results of microtremor data analysis obtained dominant frequency values of 7.03 - 19.36 Hz, amplification of 0.72 – 3.7, and seismic vulnerability index of 0.074 – 0.95. Based on the parameters, it can be concluded that the Kota Lama Semarang area has a low level of vulnerability.</p>

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Section: Microtremor Data Processingmentioning

confidence: 95%

Soil Vulnerability Levels based on Microtremor Data using the HVSR method in the Old City Area of Semarang

Supriyadi

Muttaqin

Khumaedi

et al. 2022

J. Phys.: Theor. Appl.

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“…The HVSR method uses three components of ambient seismic noise in the horizontal direction of the west-east, north-south, and vertical directions consisting of long-term microtremors generated by natural activities, such as wind, sea waves, and rain, with periods of greater than 2 seconds; short-term microtremors produced by human activities, such as traffic and machinery; and other tremor sources with periods of less than 2 seconds [30]. This microtremor method is a passive seismic method with a single measurement station.…”

Section: Fig 2 Map Of the Research Area In Kota Lama Semarangmentioning

confidence: 99%

Study of the Subsurface Structure Based on Microseismic Data in the Heritage Area of Kota Lama Semarang, Indonesia

Supriyadi¹

2022

GEOMATE

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Microseismic measurements are popularly applied to investigate local seismic responses based on the dominant frequency and amplification factor. Understanding the resonance frequency of heritage sites and their buildings is essential in spatial and regional planning in Kota Lama Semarang. The problem to be solved in this research is that there are no subsurface data available, especially the vulnerability index. The method that is applied to solve the problem is the HVSR method and the data obtained are Kg (vulnerability index), PGA (peak ground acceleration), and GSS (ground shear strain). This study aims to describe the subsurface structure in Kota Lama in 2 dimensions based on Kg, PGA, and GSS data. Data analysis of microtremors showed that the predominant frequency (f 0 ) values range from 5.36-17.86 Hz, the amplification (A 0 ) values range from 0.25-0.87, the Kg values range from 0.62-5.8 x 10 -2 cm/s 2 , the PGA values range from 3.9-7.5 x 10 -2 gal, and the GSS values range from 0.6-12.58 x 10 -6 . The subsurface structure was assessed using the Vs value, which was determined by a 2D profile consisting of 5 slices at a depth of 100 m depth. Slice 1 has Vs values ranging from 100-1300 m/s, slice 2 has values ranging from 100-1600 m/s, slice 3 has values ranging from 100-800 m/s, slice 4 has values ranging from 100-800 m/s, and slice 5 has values ranging from 100-1200 m/s. According to the values of Vs > 1500 m/s, the subsurface area of Kota Lama Semarang is dominated by soft rocks.

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“…To compute the dispersion curve of the seismic signals emerging from the CC functions, we applied a velocity analysis to them. The method is similar to the constant velocity stack (CVS) analysis (Yilmaz, 1987;Yamanaka et al, 1994), which is very popular in active seismic reflection processing and has already been used on CC results for different Italian areas (Vassallo et al, 2019;Di Giulio et al, 2020). The CC functions were filtered in different frequency bands starting from 0.5 to 20 Hz.…”

Section: Velocity Profile Estimationmentioning

confidence: 99%

Detection of hidden faults within the Fucino basin from single-station ambient noise measurements: The case study of the Trasacco fault system

et al. 2022

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The presence of normal fault systems in central Italy, outcropping or hidden below Quaternary covers in intra-mountain basins, is the expression of the Neogene–Quaternary evolution of the area, characterized by an extensional tectonic regime following the fold and thrust structuring of the Apennine orogen. Italian urban settlements of central Italy are developed on hills or mountains but also in lowland areas, which are often set up in sedimentary basins. In this framework, urban centers found close to fault lines are common, with strong implications on the seismic risk of the area. In this work, we performed a dense seismological passive survey (88 single-station ambient noise measurements) and used the horizontal-to-vertical spectral ratio (HVNSR) technique to investigate hidden faults in the Trasacco municipality located in the southern part of the Fucino Basin (central Italy), where microzonation studies pointed out hypothetical fault lines crossing the urban area with the Apennine orientation. These hidden structures were only suggested by previous studies based on commercial seismic lines and aerial photogrammetry; their presence in the basin area is confirmed by our measurements. This case study shows the potentiality of using the HVNSR technique in fault areas to have a preliminary indication of anomalous behaviors, to be investigated later with specific geophysical techniques. Our approach can support microzonation studies whenever fault zones are involved, especially in urban areas or in places designated for future developments.

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Characteristics of long-period microtremors and their applicability in exploration of deep sedimentary layers

Cited by 167 publications

References 12 publications

Soil Vulnerability Levels based on Microtremor Data using the HVSR method in the Old City Area of Semarang

Soil Vulnerability Levels based on Microtremor Data using the HVSR method in the Old City Area of Semarang

Study of the Subsurface Structure Based on Microseismic Data in the Heritage Area of Kota Lama Semarang, Indonesia

Detection of hidden faults within the Fucino basin from single-station ambient noise measurements: The case study of the Trasacco fault system

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