Identification of Lembang fault, West-Java Indonesia by using controlled source audio-magnetotelluric (CSAMT)

Sanny, Teuku Abdullah

doi:10.1063/1.4990889

Cited by 5 publications

(6 citation statements)

References 2 publications

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“…The Cimandiri active fault zone consists of six segments with a predominant sense of reverse motion (Marliyani et al 2016). Based on CSAMT data it is shown that the Lembang and Cimandiri faults are not connected to each other (Sanny 2017).…”

Section: Introductionmentioning

confidence: 99%

Identification of active faults in West Java, Indonesia, based on earthquake hypocenter determination, relocation, and focal mechanism analysis

et al. 2018

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We determined earthquake locations through re-picking of P-and S-wave arrival times recorded by BMKG network. Earthquake locations were determined using Hypoellipse code that employs a single event determination method. We then relocated the events using hypocenter double-difference method. We also conducted focal mechanism analysis to estimate the type of fault slip. The results indicate improved hypocenter locations, where patterns of seismicity in West Java were delineated clearly. There are several clusters of earthquakes at depths ≤ 30 km, which are probably related to the Cimandiri, Lembang, and Baribis faults. In addition, there is another cluster in Garut trending southwest-northeast, which is possibly related to a local fault. Histograms of travel-time residuals depict good results, in which travel-time residuals are mostly close to zero. Source mechanism throughout the Lembang fault indicates a left-lateral strike slip in agreement with previous studies. The Cimandiri fault also shows a left-lateral slip, but in the south it shows a thrust fault mechanism. While the source mechanisms of the western part of the Baribis fault indicate a thrust fault and the cluster of events in Garut shows a right-lateral slip if they are related to a local fault.

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Section: Introductionmentioning

confidence: 99%

Identification of active faults in West Java, Indonesia, based on earthquake hypocenter determination, relocation, and focal mechanism analysis

et al. 2018

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“…The focal mechanism has a strike-slip fault as in the shallow part (Rasmid et al, 2014;Afnimar et al, 2015;Supendi et al, 2018;Nugraha et al, 2019); this observation is also supported by geodetic GPS observations (Abidin et al, 2008(Abidin et al, , 2009Meilano et al, 2012). Geological observations across the Lembang Fault (Daryono et al, 2019) show a normal fault with the northern part relatively lower than the southern part; this analysis is also supported by gravity (Firdaus et al, 2016;Laesanpura et al, 2019) and controlled source audio magnetotelluric (CSAMT) measurements (Sanny, 2017).…”

Section: Introductionmentioning

confidence: 76%

“…According to historical records, major earthquakes occurred along this fault in 1699, 1834, and 1900 (Visser 1922;Wichmann 1918) (Abidin et al, 2008(Abidin et al, , 2009Meilano et al, 2012). Geological observations across the Lembang Fault (Daryono et al, 2019) show a normal fault with the northern part relatively lower than the southern part; this analysis is also supported by gravity (Firdaus et al, 2016;Laesanpura et al, 2019) and controlled source audio magnetotelluric (CSAMT) measurements (Sanny, 2017).…”

Section: Regional Geologic Structurementioning

confidence: 88%

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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“…The Lembang fault has been located in numerous researches using various geophysical techniques [10][11][12][13][14][15]. Additionally, several research employs magnetotelluric techniques such as volcanic mapping [16][17][18][19][20][21], fault identifying [22][23][24], and finding geothermal [25,26].…”

Section: Introductionmentioning

confidence: 99%

Resistivity Distribution of Lembang Fault Based on Magnetotelluric Data

Nurhasan,

Naufal,

Srigutomo

et al. 2024

J. Phys.: Conf. Ser.

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The Lembang fault located 15 Km north of Bandung City is one of the active faults situated on Java Island, Indonesia. The Lembang fault is an extension of the Cimandiri fault that can be one of the potential sources of earthquakes in Indonesia. In this study, the Magnetotelluric method was used to model the subsurface resistivity at the Lembang Fault area. The data acquisition was conducted in 8 points of measurement forming a line perpendicular to the Lembang Fault. The analysis was performed using 1D inversion of apparent resistivity and phase with the frequency range of 1 Hz to 320 Hz. The contrast apparent resistivity has observed in two sites around the fault. The inversion results show resistivity contrasts around the LMB02 point that is suspected to be the Lembang Fault. These results are consistent with geological data in the Lembang Fault area. Aside from the LMB02 point, there are also resistivity contrasts around the LMB05 point. However, from a geological perspective, it is not yet known whether the area around the LMB05 point represents a fault.

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Identification of Lembang fault, West-Java Indonesia by using controlled source audio-magnetotelluric (CSAMT)

Cited by 5 publications

References 2 publications

Identification of active faults in West Java, Indonesia, based on earthquake hypocenter determination, relocation, and focal mechanism analysis

Identification of active faults in West Java, Indonesia, based on earthquake hypocenter determination, relocation, and focal mechanism analysis

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

Resistivity Distribution of Lembang Fault Based on Magnetotelluric Data

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