Two-Dimensional Boundary Element Method Application for Surface Deformation Modeling around Lembang and Cimandiri Fault, West Java

Mahya, M J; Sanny, Teuku Abdullah

doi:10.1088/1755-1315/62/1/012009

Cited by 2 publications

(2 citation statements)

References 4 publications

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“…The separation between the surface trace of the western end of the Lembang Fault and the eastern end of the Cimandiri Fault is less than ∼5 km. While some authors suggest that the two faults are not connected at depth (Mahya and Sanny, 2017), most agree that the broader strain pattern is consistent across the two faults (e.g. Abidin et al, 2009;Kopp, 2011;Marliyani et al, 2016;Daryono et al, 2019).…”

Section: Multi-segment Ruptures With the Cimandiri Fault Zonementioning

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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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: Multi-segment Ruptures With the Cimandiri Fault Zonementioning

confidence: 99%

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

Hussain

Gunawan

Hanifa³

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…The separation between the surface trace of the western end of the Lembang Fault and the eastern end of the Cimandiri Fault is less than ∼ 5 km. While some authors suggest that the two faults are not connected at depth (Mahya and Sanny, 2017), most agree that the broader strain pat- tern is consistent across the two faults (e.g. Abidin et al, 2009;Kopp, 2011;Marliyani et al, 2016;Daryono et al, 2019).…”

Section: Multi-segment Ruptures With the Cimandiri Fault Zonementioning

confidence: 99%

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

Hussain,

Gunawan,

Hanifa

et al. 2023

Nat. Hazards Earth Syst. Sci.

View full text Add to dashboard Cite

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 to 1.95–3.45 mm yr−1, derived from a GNSS (global navigation satellite system) 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 – interferometric synthetic aperture radar) 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−1, with the shallow portions of the fault creeping at 2.2 mm yr−1. Previous studies 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 equivalent to magnitude 6.6–7.0 earthquakes, indicating that the fault poses a very real hazard to the local population. Using the Global Earthquake Model OpenQuake engine we calculate ground motions for these two earthquake scenarios and estimate that 1.9–2.7 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, understanding their past activity, and measuring the current strain rates of smaller crustal active faults located near large cities in seismic zones.

show abstract

Two-Dimensional Boundary Element Method Application for Surface Deformation Modeling around Lembang and Cimandiri Fault, West Java

Cited by 2 publications

References 4 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

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

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