Moment tensor inversion implementation in determining focal mechanism solution of Palu-Koro and Matano fault events: processing strategy

Kusumawati, Dian; Sahara, David P.; Puspito, Nanang T.; Baskara, Aria Widhi; Kurniawan, Andri; Tanihaha, Wahyu; Solihin, Leonardo Junior Johan; Pratama, Muhamad Diva; Patimah, Sindi Hajah; Sasmi, Annisa Trisnia; Muhammad, Hilmy; Muhammad, Hammam; Natafrisca, Widjra Cyiena Christi; Bening, Maulidia Ain

doi:10.1088/1755-1315/1227/1/012043

Cited by 2 publications

References 8 publications

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Bayesian Moment Tensor Analysis of The 2012 Mw 6.3 Palu Earthquake Sequence for Updating The Palu-Saluki Segments and Its Impact on Coulomb Stress Distribution

Habibana,

Sahara,

Kusumawati

et al. 2024

Preprint

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The Palu-Koro fault, part of the Central Sulawesi fault system, has produced many large earthquakes (Mw > 6). Palu earthquake on 18 August 2012 (Mw 6.3) which occurred close to the largest earthquake ever recorded in Central Sulawesi, the Donggala earthquake on 28 September 2018 (Mw 7.5), also caused notable damage around Palu, the capital of Central Sulawesi, Indonesia. We infer 16 earthquake events of magnitudes ranging from Mw 3.9 to 6.3, which occurred between 18 August and 31 December 2012 by applying Bayesian moment tensors inversion and get criteria A and B, using catalogue and waveform data from Meteorology, Climatology, and Geophysics Agency (BMKG) regional stations. Our results show that the 2012 earthquake sequence showed a left-lateral strike-slip mechanism, with the mainshock located west of Lake Lindu. Many aftershocks were distributed near the northern end of the Saluki segment of the Palu-Koro Fault. The inferred solution has strike of North-Northwest to South-Southeast and a dip angle of about 82.5°, updating vertical fault from National Earthquake Center (PusGeN). After Calculating the change in Coulomb stress on the fault using a new geometry based on the moment tensor solution, we find that the model shows larger stress changes, up to 5 bars, with a wider impact area compared to vertical fault. Hence, updating the geometry of the Palu-Saluki Segment is important in constructing seismic hazard analyses in the region.

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Bayesian Moment Tensor Analysis of The 2012 Mw 6.3 Palu Earthquake Sequence for Updating The Palu-Saluki Segments and Its Impact on Coulomb Stress Distribution

Habibana,

Sahara,

Kusumawati

et al. 2024

Preprint

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Comparison of Crustal Stress and Strain Fields in the Himalaya–Tibet Region: Geodynamic Implications

Pietrolungo,

Lavecchia,

Madarieta-Txurruka

et al. 2024

Remote Sensing

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The Himalaya–Tibet region represents a complex region of active deformation related to the ongoing India–Eurasia convergence process. To provide additional constraints on the active processes shaping this region, we used a comprehensive dataset of GNSS and focal mechanisms data and derived crustal strain and stress fields. The results allow the detection of features such as the arc-parallel extension along the Himalayan Arc and the coexistence of strike-slip and normal faulting across Tibet. We discuss our findings concerning the relevant geodynamic models proposed in the literature. While earlier studies largely emphasized the role of either compressional or extensional processes, our findings suggest a more complex interaction between them. In general, our study highlights the critical role of both surface and deep processes in shaping the geodynamic processes. The alignment between tectonic stress and strain rate patterns indicates that the crust is highly elastic and influenced by present-day tectonics. Stress and strain orientations show a clockwise rotation at 31°N, reflecting deep control by the underthrusted Indian Plate. South of this boundary, compression is driven by basal drag from the underthrusting Indian Plate, while northward, escape tectonics dominate, resulting in eastward movement of the Tibetan Plateau. Localized stretching along the Himalaya is likely driven by the oblique convergence resulting from the India–Eurasia collision generating a transtensional regime over the Main Himalayan Thrust. In Tibet, stress variations appear mainly related to changes in the vertical axis, driven by topographically induced stresses linked to the uniform elevation of the plateau. From a broader perspective, these findings improve the understanding of driving crustal forces in the Himalaya–Tibet region and provide insights into how large-scale geodynamics drives surface deformation. Additionally, they contribute to the ongoing debate regarding the applicability of the stress–strain comparison and offer a more comprehensive framework for future research in similar tectonic settings worldwide.

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Moment tensor inversion implementation in determining focal mechanism solution of Palu-Koro and Matano fault events: processing strategy

Cited by 2 publications

References 8 publications

Bayesian Moment Tensor Analysis of The 2012 Mw 6.3 Palu Earthquake Sequence for Updating The Palu-Saluki Segments and Its Impact on Coulomb Stress Distribution

Bayesian Moment Tensor Analysis of The 2012 Mw 6.3 Palu Earthquake Sequence for Updating The Palu-Saluki Segments and Its Impact on Coulomb Stress Distribution

Comparison of Crustal Stress and Strain Fields in the Himalaya–Tibet Region: Geodynamic Implications

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