Growth of forearc highs and basins in the oblique Sumatra subduction system

Pleistocene Accelerated Exhumation Within the Sumatran Fault: Implications for Late Cenozoic Evolution of Sumatra (Indonesia)

“…Another key question is what caused the initiation or accelerated motion of the Sumatran fault in the Pleistocene? The fault is likely associated with a phase of compressional deformation that affected major sedimentary basins and the volcanic arc of Sumatra, including the forearc basin (Mukti et al., 2021). Regionally, the Miocene and particularly the mid‐Miocene‐Present marks a switch from regional extension to compression in SE Asia, which primarily reflects changes in the forces applied to the plate boundaries due to the Australia‐Sundaland collision (Pubellier & Morley, 2014).…”

“…If the Sumatran fault is a late‐stage addition to the configuration of the Sunda subduction system, it seems reasonable to assume that other equivalent faults, perhaps lying offshore closer to the trench, were kinematically linked with the Andaman Sea and Sunda Strait and potentially accommodated late Miocene‐Pliocene plate convergence. Some large faults have been identified in the forearc area, such as the Mentawai and West Andaman faults (e.g., Berglar et al., 2017; Malod & Kemal, 1996; Mukti et al., 2021; Figure 3b). The West Andaman fault is active today due to seismicity, and its onset of displacement could pre‐date 5.9 Ma (e.g., Dasgupta et al., 2005; Diehl et al., 2013; Morley & Alvey, 2015).…”

“…The West Andaman fault is active today due to seismicity, and its onset of displacement could pre‐date 5.9 Ma (e.g., Dasgupta et al., 2005; Diehl et al., 2013; Morley & Alvey, 2015). However, the amount of strike‐slip displacement on these faults is disputed and is likely to be considerably less than the displacement magnitudes required for accommodation of oblique plate motion (Mukti et al., 2021).…”

Fragility of Indonesian houses: scenario damage analysis of the 2006 Yogyakarta and 2009 Padang earthquakes

“…Thus, the Abrahamson et al (2016) GMM with a defined back-arc region is considered in this study. The fore-arc and back-arc regions are defined using the zones in Mukti et al (2021). Zhao et al (2016b) use a parameter called Rvolc, which is the distance on the surface of the earth that the seismic waves travel through a defined volcanic zone.…”