Investigation of Subsurface Characteristics by using a Vs30 Parameter and a Combination of the Hvsr and Spac Methods for Microtremor Arrays

Pramono, Sigit; Prakoso, Widjojo Adi; Cummins, Phil R.; Rahayu, Astri; Rudyanto, Ariska; Syukur, Fajri; Piandatte, Sofian

doi:10.14716/ijtech.v8i6.682

Cited by 9 publications

(6 citation statements)

References 6 publications

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“…It is noted that some previous studies showed that the presence of a large amplitude HVSR peak is related to a high impedance contrast between the sedimentary cover and the basement (Bard 1999;Bonnefoy-Claudet et al, 2006;Bonnefoy-Claudet et al, 2009), while a low amplitude peak is related to a lower contrast, indicating the presence of a hard soil (Woolery and Street 2002;Bonnefoy-Claudet et al, 2006;Bonnefoy-Claudet et al, 2009). It is noted that recent studies on the effects of local site characteristics on strong motions include Seyhan and Stewart (2014), Borcherdt (2015), Ji et al (2017), Pramono et al (2017), Prakoso et al (2017, as well as Mase (2018).…”

Section: Methodsmentioning

confidence: 96%

Investigation of Ground Motion and Local Site Characteristics of the 2018 Lombok Earthquake Sequence

Pramono

Prakoso²,

Rohadi

et al. 2020

IJTech

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In 2018, Lombok Island was hit by a major earthquake sequence. The Indonesia Meteorological, Climatological, and Geophysics Agency (BMKG) reported that the Lombok Island earthquake sequence started with an Mw 6.4 foreshock, followed by an Mw 6.8 main shock, aftershocks of Mw 5.8 and Mw 6.2, and a second mainshock of Mw 6.9 in the eastern part of Lombok. This study presents an investigation of strong motion characteristics using the Indonesia National Strong Motion Network (INSMN) data from two accelerometer stations, the MASE station (at Praya Lombok International Airport, Lombok Island, Vs30 = 770 m/s, SB site class) and TWSI station (in Sumbawa Island, Vs30 = 1152 m/s, SB site class). Signal analysis techniques using a power spectrum via fast Fourier transform, wavelet transform and horizontal-to-vertical spectral ratio (HVSR) have been applied in this study. There are significant differences in the results (e.g., predominant frequencies, wavelets, H/V ratios, and frequencies at peak H/V ratio) for the MASE and TWSI stations, highlighting the importance of actual Vs30 profiles and the limitation of the site class system in providing necessary predictive information. The variation of the peak ground acceleration (PGA) values and the spectral amplitudes could only be explained by hypothesizing the effect of the volcanic structure of Mount Rinjani on the strong motion waveforms.

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Section: Methodsmentioning

confidence: 96%

Investigation of Ground Motion and Local Site Characteristics of the 2018 Lombok Earthquake Sequence

Pramono

Prakoso²,

Rohadi

et al. 2020

IJTech

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“…The Microtremor method has been widely used for site effect studies in the last decade [21], [24], [25]. Microtremor is a very small motion compared to the amplitude of an earthquake.…”

Section: A Horizontal To Vertical Spectral Ratio (Hvsr) Inversionmentioning

confidence: 99%

Seismic Hazard Zonation in Gedebage Future Development in Bandung City Using HVSR Inversion

Rohaendi¹,

Robiana

Sukiyah³

et al. 2021

Int. J. Adv. Sci. Eng. Inf. Technol.

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Greater Bandung, the largest economic growth corridor in Indonesia after Jabodetabek, is sitting on the Bandung basin. This deep sedimentary basin is situated just 12 km south of the active Lembang fault. Gedebage is an area intended to be the new economic and business center located in the easternmost of Bandung. The research aims to identify the vulnerability of Gedebage area against seismic ground motions. The area's morphology is dominated by a flat area with 0 -8% of slope and predominantly composed of an old lake deposit. Topography, including basement morphology, sediment thickness, and physical properties, plays a great role in escalating/de-escalating seismic ground motions. A specific morphology may trap and prolong seismic shaking. Furthermore, stiffness and bedrock depth are instrumental in passing the spectral ground motions to the surface. The HVSR inversion method is applied to map subsurface conditions that successfully applied in Palu and its surrounding area. The research shows that Gedebage areas are vulnerable to the seismic hazard, referring to the shear wave velocity (Vs30) distribution and seismic hazard micro zonation maps. The discussion of the research findings is useful for future infrastructure development in the research area. The area is categorized as soft soil and medium soil classes, and it has a high vulnerability for destruction if there is an earthquake. The area should be cleared from vital infrastructures such as government buildings, schools, or hospitals.

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“…No slip rate estimates are available for the Palolo Fault, the Sausu Fault, and the Tokararu Fault. It is highlighted that the Palu-Koro Fault moved with a magnitude of 7.4 on 28 September 2018, causing a permanent sinistral offset up to about 5 m. The local site condition in Palu City identified by Pramono et.al [10] showed the deep of the engineering bedrock and site classification.…”

Section: Introductionmentioning

confidence: 95%

Influence of Seismicity Declustering on Ground Motion Prediction Equations for Central Sulawesi Seismic Region

Pramono

Prakoso²,

Rohadi

et al. 2020

GEOMATE

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Central Sulawesi has very complex tectonic conditions, and therefore the earthquake hazard of the region needs to be carefully examined. One of the required components to develop such examination is regional ground motion prediction equations. This study describes the development of GMPEs for Central Sulawesi based on broadband velocitymeter and strong motion accelerations recorded by instruments managed by Indonesia geophysical authority temporarily since year 2015 and 2017. The accuracy of the resulting equations is examined further by performing the seismicity declustering processes using the Reasenberg method; the declustering process is to separate mainshock events from foreshock and or aftershock events. Note that, as the site class of the instrument locations is SD, the resulting GMPEs are only for SD sites. The resulting expected geometric mean peak ground acceleration from GMPE for all shocks (dependent seismicity) is similar to that for mainshocks only (independent seismicity), except for higher magnitude earthquakes due to the limited number of data available. The expected PGA values are examined further by comparing the values with the actual PGA from earthquakes in the Sausu Fault region, including the damaging 29 May 2019 earthquake. Depending on the earthquake magnitude, the GMPEs may overestimate or underestimate the PGA values. In addition, the residual analyses are conducted to examine trends of the expected PGA values.

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Investigation of Subsurface Characteristics by using a Vs30 Parameter and a Combination of the Hvsr and Spac Methods for Microtremor Arrays

Cited by 9 publications

References 6 publications

Investigation of Ground Motion and Local Site Characteristics of the 2018 Lombok Earthquake Sequence

Investigation of Ground Motion and Local Site Characteristics of the 2018 Lombok Earthquake Sequence

Seismic Hazard Zonation in Gedebage Future Development in Bandung City Using HVSR Inversion

Influence of Seismicity Declustering on Ground Motion Prediction Equations for Central Sulawesi Seismic Region

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