Geodetic observation of strain accumulation in the Banda Arc region

Rahmadani, Suchi; Meilano, Irwan; Susilo, Susilo; Sarsito, Dina A.; Abidin, Hasanuddin Z.; Supendi, Pepen

doi:10.1080/19475705.2022.2126799

Cited by 5 publications

(5 citation statements)

References 45 publications

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“…The EWF segment has more seismicity than the WWF segment. Overall, seismicity in these two segments was low, consistent with a slip rate of 0.5 mm/yr based on recent geodetic observations byRahmadani et al (2022). Other seismotectonic sources in Region III originated from the local fault in the land, while the South Arm off the coast was most likely associated with the Selayar Fault Zone.We characterized Region IV (Figure6d) as the most complex region of the shallow part (< 60 km) in our study area.…”

supporting

confidence: 81%

“…The two largest earthquakes along this fault are the 1980 (Mw 6.1) and 2011 (Mw 6.1) earthquakes, respectively. Statistically, the occurrence of a 6.1 Mw earthquake every ~30 years is reasonable, considering the 7 mm/yr slip rate of this fault (Rahmadani et al, 2022). The eastern edge of the Matano fault was interpreted to link with the arcuated Tolo thrust (Silver et al, 1983b;Hinschberger et al, 2005;Titu-eki & Hall, 2020).…”

Section: Shallow Part (<60 Km)mentioning

confidence: 93%

“…Moreover, no recent evidence of movement existed along the Lawanopo fault, and this fault was categorized as a non-active fault (Bellier et al, 2006;Natawidjaja & Daryono, 2015). Furthermore, recent geodetic studies with more coverage GPS stations indicated only 0.1 mm/year for the Lawanopo fault's slip rate (Rahmadani et al, 2022).…”

Section: Tectonics and Geological Settings Of Sulawesimentioning

confidence: 99%

“…The WNW-ESE trending left-lateral Matano strike-slip fault is often interpreted as the southeastern continuation of the Palu-Koro fault (Hamilton, 1979;Bellier et al, 2006;Socquet et al, 2006;Watkinson et al, 2017). Recent geodetic studies revealed that the Matano fault has a slip rate of 7 mm/yr (Rahmadani et al, 2022). The Matano fault's southeastern extension to the offshore is connected to the west-dipping arcuated Tolo thrust (also known as the Tolo trough) that accommodated the convergence of the North Banda Sea and the Southeast Arm of Sulawesi since ~3 Ma (Silver et al, 1983b;Hinschberger et al, 2005;Titu-eki & Hall, 2020).…”

Section: Tectonics and Geological Settings Of Sulawesimentioning

confidence: 99%

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Seismotectonics of Sulawesi, Indonesia

Serhalawan¹,

Chen

2023

Preprint

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In eastern Indonesia, Sulawesi Island lies at the triple junction of the Australian, Sunda, and Phillippine Sea plates. The distinctive K-shape of Sulawesi, consisting of four arms (North, South, East, and Southeast), resulted from continuous geological evolution at different stages. Consequently, each arm has a different deformation style and tectonic setting. We studied the seismotectonics of Sulawesi using the updated dataset for earthquake seismicity and focal mechanisms, including additional supporting data. We grouped Sulawesi shallow part (< 60 kilometers) into six regions, while the deep part (60-400 kilometers) related to the Celebes Sea and Sula slabs. Regarding the shallow part, we found a lack of seismicity in the northern Palu-Koro fault and near the center of the North Sulawesi Trench, although these zones have high slip rates. On the deep part, the Celebes Sea slab showed an increasing dip as depth increased, whereas the Sula slab showed a steeply dipping slab. Moreover, the western Sula slab indicated an absence of shallow depth earthquakes (60–230 kilometers). Based on our investigations, we derived the following well-founded conclusions: (1) The northern Palu-Koro fault was beyond the high relative motion of the Makassar and North Sula blocks, resulting inactive seismicity. (2) A seismic gap or aseismic slip from the Celebes Sea subduction probably produced the low seismicity level near the center of the North Sulawesi Trench. (3) The shallow inactive seismicity in the western Sula slab might be due to the upper slab detaching during the first stage collision in the Early Miocene.

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supporting

confidence: 81%

Section: Shallow Part (<60 Km)mentioning

confidence: 93%

Section: Tectonics and Geological Settings Of Sulawesimentioning

confidence: 99%

Section: Tectonics and Geological Settings Of Sulawesimentioning

confidence: 99%

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Seismotectonics of Sulawesi, Indonesia

Serhalawan¹,

Chen

2023

Preprint

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“…We utilized a boundary based on seismicity separating the TIMO and SERA blocks to decrease the χ n 2 value and satisfy an F-test (Figure S5 and Table S3 of Supporting Information S1). This new boundary setting is consistent with the seismic zone defined by Rahmadani et al (2022). Koulali et al (2016) defined the boundary between the Western and Eastern Makassar Blocks (WMAK and EMAK, respectively) by combining the southern Palu, Masupu, and Walanae Faults, extending the latter offshore along the Selayar Trough, and then continuing this boundary in a southward direction until it connects with the Flores Back-arc Thrust.…”

Section: Preferred Best-fit Model Geometriessupporting

confidence: 68%

New Insights Into Crustal Deformation of the Indonesia–Australia–New Guinea Collision Zone From a Broad‐Scale Kinematic Model

et al. 2023

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Regions with active tectonic activity like the IANGCZ are often delineated in global plate models as "deforming zones" (Kreemer et al., 2014) or "orogens" (Bird, 2003), for which crustal motion data are excluded from the determination of the otherwise rigid plate motion. Even as early as the 1970s, however, it was recognized that such areas of deformation are often themselves usefully described in terms of discrete "microplates" (e.g., Alvarez et al., 1974;Dewey et al., 1973), relatively small-scale blocks with little internal deformation except near

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