Microtremor exploration for shallow S-wave velocity structure in Bandung Basin, Indonesia

Pramatadie, Andi Muhamad; Yamanaka, Hiroaki; Chimoto, Kosuke; Koketsu, Kazuki; Sakaue, Motoharu; Sengara, I Wayan; Sadisun, Imam A.

doi:10.1071/eg16043

Cited by 10 publications

(5 citation statements)

References 14 publications

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“…We attempt to account for basin amplification in our ground motion model by using the Vs30 velocities -the shear wave velocity in the top 30 m of soil. Pramatadie et al (2017) conducted a microtremor survey of the Bandung basin and calculated the shallow shear wave velocity for 29 sites across the basin. We supplemented these point measurements with estimated Vs30 velocities from the USGS Global Vs30 Map Server (Wald and Allen, 2007;Allen and Wald, 2009).…”

Section: Scenario Earthquake Hazardmentioning

confidence: 99%

“…Vs30 velocities -the shear wave velocity in the top 30 m of soil for the Bandung Metropolitan Region from the USGS Global Vs30Map Server(Wald and Allen, 2007;Allen and Wald, 2009). Velocities are estimated using topographic slope as a proxy, assuming stiffer materials with faster Vs30 values are more likely to maintain a steep slope and flat sedimentary basins are characterised by a lower velocity.The white bordered circles are the point measurements of Vs30 velocities from a microtremor survey byPramatadie et al (2017). The white lines are the mapped Lembang fault trace byDaryono et al (2019).…”

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confidence: 99%

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The seismic hazard from the Lembang Fault, Indonesia, derived from InSAR and GNSS data

Hussain

Gunawan

Hanifa³

et al. 2023

Preprint

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Abstract. A growing number of large cities are located near poorly understood faults that have not generated a significant earthquake in recent history. The Lembang Fault is one such fault located near the city of Bandung in West Java, Indonesia. The slip rate on this fault is debated with estimates ranging from 6 mm/yr to 1.95–3.45 mm/yr, derived from GNSS campaign and geological measurements respectively. In this paper we measure the surface deformation across the Bandung region and resolve the slip rate across the Lembang Fault using radar interferometry (InSAR) analysis of 6 years of Sentinel-1 satellite data and continuous GNSS measurements across the fault. Our slip rate estimate for the fault is 4.7 mm/yr, with the shallow portions of the fault creeping at 2.2 mm/yr. Previous studies have estimated the return period of large earthquakes on the fault to be between 170–670 years. Assuming simplified fault geometries and a reasonable estimate of the seismogenic depth we derive an estimated moment deficit of a magnitude 6.8–7.2 earthquakes; indicating that the fault poses a very real risk to the local population. Using the Global Earthquake Model OpenQuake-engine we calculate ground motions for these two earthquake scenarios and estimate that 2.5–3.3 million people within the Bandung Metropolitan region would be exposed to ground shaking greater than 0.3 g. This study highlights the importance of identifying active faults and understanding their past activity, and measuring the current strain rates of smaller crustal active faults located near large cities in seismic zones.

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Section: Scenario Earthquake Hazardmentioning

confidence: 99%

mentioning

confidence: 99%

The seismic hazard from the Lembang Fault, Indonesia, derived from InSAR and GNSS data

Hussain

Gunawan

Hanifa³

et al. 2023

Preprint

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“…Aplikasi metode ini sudah banyak dilakukan dalam penyelidikan geoteknik karena operasionalnya relatif sederhana dan sangat efektif untuk menentukan profil bawah permukaan berdasarkan parameter kecepatan gelombang-S (Vs). Survei microtremor dengan menggunakan konfigurasi model array berbentuk segitiga samasisi memungkinkan untuk melakukan analisis data dengan menggunakan metode Spatial Autocorrelation (SPAC) (Okada 2006;Nakahara 2012), dimana penerapan metode ini sudah berhasil dilakukan di Jakarta (Ridwan et al 2019) dan di cekungan Bandung (Pramatadie et al 2017).…”

Section: Microtremor Arrayunclassified

Karakterisasi Site di Lokasi Stasion Monitoring Gempa Pada Dugaan Jalur Sesar Baribis

Ridwan

Rusli

Sarumpaet³

2021

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Merujuk pada beberapa publikasi sebelumnya dimana jalur sesar Baribis yang berasal dari kawasan Subang diduga masih menerus ke arah Barat mendekati kawasan Jakarta. Hal tersebut menjadi perhatian banyak ahli untuk melakukan kajian lebih detail karena dikhawatirkan akan berdampak pada beberapa kota besar di sekitarnya. Sebagai tahap awal studi adalah melakukan pemantauan kejadian gempa di sekitar dugaan jalur sesar dengan memasang seismograf untuk mengetahui aktivitas sesar. Bersamaan dengan pelaksanaan pembangunan stasiun pemantau gempa, kajian karakterisasi situs dilakukan pada setiap lokasi yaitu di Jatiluhur, Walahar, dan Cipamingkis dengan menggunakan metode Standar Penetration Test (SPT), Microtremor Array dan HVSR. Hasil uji lapangan untuk lokasi Jatiluhur diperoleh periode predominan (T) = 0,77 detik, Vs30 = 274,17 m/detik, kedalaman batuan dasar 276 m dan NSPT30 = 40,05, di Walahar T = 0,58 detik, Vs30 = 264,35 m/detik , kedalaman batuan dasar 305 m, NSPT30 = 15,14, sedangkan di Cipamingkis T = 0,37 detik, Vs30 = 269,16 m/detik, kedalaman batuan dasar 190 m, NSPT30 = 35,83. Berdasarkan hasil tersebut seluruh lokasi kajian dapat diklasifikasikan kedalam jenis tanah sedang (kelas SD). Hasil ini dapat digunakan sebagai referensi untuk berbagai keperluan, termasuk studi amplifikasi dan analisis bahaya seismik.

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“…Understanding the potential sources of earthquakes is important in earthquake disaster mitigation (Custódio et al, 2015;Yousuf et al, 2020). In addition to the in uence of potential earthquake sources, the presence of soft sedimentary rock that has a small shear wave velocity value also has a strong effect on the amount of shaking caused by an earthquake due to the phenomenon of ampli cation Pramatadie et al, 2017;Syaifuddin et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

High Resolution 3D Shallow Crustal Structure of the Lembang Fault, West Java, Indonesia, produced with Ambient Noise Tomography

Syaifuddin

Nugraha

Zulfakriza

et al. 2022

Preprint

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The Lembang Fault is located about eight km north of Bandung City, the capital city of the West Java province of Indonesia, with about 8.79 million people (dated 2020). Several studies state that the Lembang fault is an active fault with a maximum magnitude of 6.5 to 7. In terms of earthquake disaster mitigation, distinguishing characteristics of seismic velocity structures around active faults is critical. This manuscript presents our new research on ambient seismic noise tomography around the Lembang Fault by deploying 73 local temporary seismometer networks to develop a 3D high-resolution shear wave velocity model. We conducted a design acquisition analysis to obtain optimal results using a ray density analysis approach to image the geometry of the Lembang fault with good illumination and resolution, which is essential for identifying shallow geological features. Our result showed that variations in velocity values, both laterally and vertically, were related to variations in the volcanic rock on the near-surface. The geometry of the Lembang Fault and the existence of a low-velocity zone are well-identified from the seismic velocity structure, which low-velocity zone area has the potential for amplifying earthquake waves during an earthquake.

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Microtremor exploration for shallow S-wave velocity structure in Bandung Basin, Indonesia

Cited by 10 publications

References 14 publications

The seismic hazard from the Lembang Fault, Indonesia, derived from InSAR and GNSS data

The seismic hazard from the Lembang Fault, Indonesia, derived from InSAR and GNSS data

Karakterisasi Site di Lokasi Stasion Monitoring Gempa Pada Dugaan Jalur Sesar Baribis

High Resolution 3D Shallow Crustal Structure of the Lembang Fault, West Java, Indonesia, produced with Ambient Noise Tomography

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