A previously unidentified fault revealed by the February 25, 2022 (Mw 6.1) Pasaman Earthquake, West Sumatra, Indonesia

Supendi, Pepen; Rawlinson, Nicholas; Prayitno, Bambang; Sianipar, Dimas; Simanjuntak, Andrean V. H.; Widiyantoro, Sri; Palgunadi, Kadek Hendrawan; Kurniawan, Andri; Shiddiqi, Hasbi Ash; Nugraha, Andri Dian; Sahara, David P.; Daryono, Daryono; Triyono, Rahmat; Adi, Suko Prayitno; Karnawati, Dwikorita; Daniarsyad, Gatut; Ahadi, Suaidi; Fatchurochman, Iman; Anugrah, Suci Dewi; Heryandoko, Nova; Sudrajat, Ajat

doi:10.1016/j.pepi.2022.106973

Cited by 11 publications

(3 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This destructive earthquake occurred in West Sumatra near the Angkola and Sumpur segments of the Great Sumatran Fault. Seismological study [5] shows that the Pasaman earthquake was caused by the Kajai Fault which is still part of the Great Sumatran Fault network. This could be an indication that the seismicity in the Gumai Mountains is still related to segments in GSF network that has not been identified before.…”

Section: Resultsmentioning

confidence: 99%

“…This fault system has a strike-slip mechanism which is divided into 19 segments [1] and has an average slip rate of between 10 to 14 mm/year [2]. Nonetheless, several significant earthquakes have occurred on the Sumatra Island without being located in the GSF fault line that had been previously mapped, for example the 2013 Mw 6.1 Aceh earthquake [3], the 2016 Mw 6.6 Pidie Jaya earthquake [4], and the Mw 6.1 Pasaman 2022 earthquake [5]. This indicates that there are still fault structures that have not been identified before.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Identification of Active Faults in Lahat and Empat Lawang Region, South Sumatra Province, Based on Seismicity and Focal Mechanism Analysis

Kurniawan,

Daniarsyad,

Gunawan

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

Self Cite

View full text Add to dashboard Cite

The BMKG earthquake catalog data for the 2014-2022 period shows seismic activity in the Gumai Mountains, South Sumatra, which is located southeast of the Ketaun Segment, east of the Musi Segment, and north of the Manna Segment. Seismic activity in this area is important to study as an early indication of the presence of other active fault segments that have not been identified before. Re-analysis on the P and S wave phases picking was carried out for the 26 earthquakes in the period of 2014 to 2022 to ensure the quality of the data used in the processing. The double-difference method was then used to relocate the hypocenter of the earthquake based on a local velocity model to identify an active fault segment lineation in the area. In addition, waveform inversion method was used to obtain the focal mechanism for 7 earthquakes which were successfully analyzed to identify the fault plane direction. By combining the results of seismicity and focal mechanism analysis, we concluded that there are 3 fault segments that have not been identified before. These segments are thought to be strongly responsible for seismic activity in Gumai Mountains in Lahat and Empat Lawang Regencies, South Sumatra, which we determine to be part of the Great Sumatran Fault network.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Identification of Active Faults in Lahat and Empat Lawang Region, South Sumatra Province, Based on Seismicity and Focal Mechanism Analysis

Kurniawan,

Daniarsyad,

Gunawan

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

Self Cite

View full text Add to dashboard Cite

show abstract

“…There were no known segments along which the Mw 6.1 Pasaman earthquake occurred. To determine whether a previously unknown segment of the Great Sumatran Fault ruptured or whether a different but equally unknown fault was to blame [8].…”

Section: Introductionmentioning

confidence: 99%

Development of Active Fault Mapping Method Using Geoelectric and Geographical Information System

Suasti

2024

GEOMATE

View full text Add to dashboard Cite

On February 25 th , 2022, an earthquake with a magnitude of 6.2 in Nagari Kajai, Talamau District, West Pasaman Regency, resulted in considerable structural damage because it originated from a shallow earthquake with a hypocenter depth of 12.6 km and is a manifestation of the strike-slip faulting system linked to the Sumatra Fault System (SFS), which is adjacent to the Angkola segment, Barumun Segment, Sumpur Segment, and Sianok Segment is a newly-found active fault in this area. All of Nagari Kajai (Kajai Village) Sub-district is covered in volcanic deposits, whether they are new (quaternary deposits) or a combination of old (tertiary deposits) and young (quaternary deposits) as a product from the Talamau Mountain and the Maninjau Mountain. These geological activities will provide a good impression of the topography and geomorphology of a newly found active fault, The Kajai Fault. The geomorphological analysis is used to get new characteristic features for this new fault line continuation using Landsat 8 imagery and supported by aerial photography using Unmanned Aerial Vehicles (UAV). A 2D subsurface image was obtained from the Wenner-Schlumberger geoelectric survey configuration to get an excellent subsurface interpretation of lithology in this area. From this interpretation, the Kajai Fault is present in a valley filled with volcanic products and a narrow diversion of the Batang Talu River. The geoelectrical survey images show a double juxtaposition from two interpreted faults, namely F1 and F2, which run through The Kajai village and are suspected to be one of the shallow earthquake sources.

show abstract

The Investigation of Viscoelastic Relaxation Following the 2018 Mw 6.2 Situbondo, Indonesia, Earthquake

Gunawan,

Wibiseno,

Widiyantoro

et al. 2023

Geotech Geol Eng

View full text Add to dashboard Cite

A previously unidentified fault revealed by the February 25, 2022 (Mw 6.1) Pasaman Earthquake, West Sumatra, Indonesia

Cited by 11 publications

References 46 publications

Identification of Active Faults in Lahat and Empat Lawang Region, South Sumatra Province, Based on Seismicity and Focal Mechanism Analysis

Identification of Active Faults in Lahat and Empat Lawang Region, South Sumatra Province, Based on Seismicity and Focal Mechanism Analysis

Development of Active Fault Mapping Method Using Geoelectric and Geographical Information System

The Investigation of Viscoelastic Relaxation Following the 2018 Mw 6.2 Situbondo, Indonesia, Earthquake

Contact Info

Product

Resources

About