Site frequency response characterisation of the Maltese islands based on ambient noise H/V ratios

Vella, Alexander; Galea, Pauline; D’Amico, Sebastiano

doi:10.1016/j.enggeo.2013.06.006

Cited by 51 publications

(31 citation statements)

References 22 publications

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“…At these sites, the amplitudes of the H/V spectral ratio were observed to be generally less than 4.0. At the LABU and DEHI sites, the H/V spectral ratios were relatively flat as was to be expected from a hard rock formation [9,12]. A relatively flat spectral ratio may also indicate the lack of a sharp impedance contrast at depth [4,9].…”

Section: Resultsmentioning

confidence: 91%

“…It was observed that the amplitudes of the H/V ratio were generally above 2.0, which is considered a clear amplitude [9,12]. From Figure 2, it can be seen that the peak amplitudes of the H/V spectral ratios in the central part (LUAN, PUTR and DEHI) and the southern part of Simeulue Island (BATU, LABU and MAUD) were lower than the peak amplitudes of the H/V spectral ratios in the northern part of the island (LFAK and LUAN).…”

Section: Resultsmentioning

confidence: 99%

“…The HVSR method consists of analysing a few minutes of noise or microtremors with three-component sensors and calculating the H/V spectral ratio [8,9]. Due to its easy measurement procedure and analysis, the HVSR method is frequently adopted in seismic microzonation studies [4,[10][11][12][13]. The HVSR method is able to give information on the resonant and fundamental frequencies of a soil site, especially when the soil has a good impedance contrast [8,9,14,15].…”

Section: Introductionmentioning

confidence: 99%

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Site Response Characteristics of Simeulue Island, Indonesia as Inferred from H/V Spectral Ratio of Ambient Noise Records

et al. 2016

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Abstract. Simeulue Island is an outer island arc west of Sumatra Island. The island is located close to the interface of the subduction zone between the IndoAustralian and Eurasian plates. Seismic activities around the island include devastating megathrust earthquakes, such as the 2004 M W 9.2 Sumatra-Andaman and 2005 M W 8.7 Nias earthquakes. We have investigated site response characteristics using the Horizontal-to-Vertical (H/V) Spectral Ratio method based on continuous ambient noise records from eight broadband seismometers. From the calculation results, generally, strong peaks were observed in the H/V spectral ratio curves caused by strong impedance contrast in this area. However, the BATU, LABU and DEHI sites showed relatively flat H/V spectral ratio curves caused by a lack of sharp impedance contrast beneath the site. Multiple peaks were observed at several sites, which may indicate the presence of a more highly weathered soil/clay layer on top of a more compact medium. H/V peak frequencies, which reveal the fundamental resonant frequencies of the soil sites, were generally observed in the range of 2.0 Hz-16.4 Hz.

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Section: Resultsmentioning

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Site Response Characteristics of Simeulue Island, Indonesia as Inferred from H/V Spectral Ratio of Ambient Noise Records

et al. 2016

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“…The observed strong peak of H/V spectral ratio may indicate the occurrence of sharp impedance contrast beneath those sites [2]. The cause of strong peak of H/V spectral ratio may come due to the site sits on the top of the soft layer above a hard rock [8,10]. The impedance is a product of seismic velocity and density of layer medium.…”

Section: Resultsmentioning

confidence: 99%

“…At much higher frequencies, the origin sources are dominantly due to human activities. The HVSR method have been frequently adopted in seismic microzonation studies [2,6,7,8,9]. The HVSR method is able to give information on the resonance or fundamental frequency of soil site with good impedance contrast [10,11,12,13].…”

Section: Introductionmentioning

confidence: 99%

Subsurface Velocity Model From Inversion of H/v Spectral Ratio of Ambient Noise Records

Anggono

Syuhada

2017

SPEKTRA

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The Horizontal-to-Vertical (H/V) spectral ratio method uses continuous ambient noise records has been used extensively to study the characteristics of site response due to the earthquake occurrence. Sources of ambient noise are usually from human activities or natural excitations and might be composed of body and surface wave components. Several studies have investigated the possibility to extract information on the shallow subsurface model from the inversion of H/V spectral ratio. In this study, we investigated the shallow subsurface velocity model below two broadband seismometers at Simeulue Island, Aceh. Two broadband seismometers of PUTR and LEWK were selected because of the relatively clear peak amplitude of H/V spectral ratios, which may reflect the existence of strong impedance contrast. The initial models are set to be fixed of five homogeneous medium layers with the last medium to be infinite homogeneous medium. By setting fixed layer boundaries in the inversion process, the velocities in the medium may vary to obtain the most suitable fitting to the observed H/V spectral ratio. From the inversion process, we suggest we suggest that the strong impedance contrasts may occur on the shallow part of the medium at 2 up to 15 m depth.

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Ambient vibration measurements to support morphometric analysis of a pyroclastic cone

et al. 2019

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Site frequency response characterisation of the Maltese islands based on ambient noise H/V ratios

Cited by 51 publications

References 22 publications

Site Response Characteristics of Simeulue Island, Indonesia as Inferred from H/V Spectral Ratio of Ambient Noise Records

Site Response Characteristics of Simeulue Island, Indonesia as Inferred from H/V Spectral Ratio of Ambient Noise Records

Subsurface Velocity Model From Inversion of H/v Spectral Ratio of Ambient Noise Records

Ambient vibration measurements to support morphometric analysis of a pyroclastic cone

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