Distribution of slip at the northern Sumatran fault system

Genrich, J. F.; Bock, Yehuda; McCaffrey, R.; Prawirodirdjo, L.; Stevens, C.; Puntodewo, S. S. O.; Subarya, C.; Wdowinski, S.

doi:10.1029/2000jb900158

Cited by 137 publications

(117 citation statements)

References 35 publications

(5 reference statements)

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“…No information is available on the continuation of the GSF within the ductile crust, even though recent studies in similar tectonic settings (South Chile subduction zone) suggest a curving of the fault at depth (Catalan et al, 2017). The GSF is segmented and consists of at least 19 major NW-SE trending subparallel branches, also forming strike-slip duplexes, with a northward increase of segment length and slip rate from 5 to 26 mm/year (Figure 1; Bellier et al, 1991Bellier et al, , 1997Duquesnoy et al, 1996;Genrich et al, 2000;Prawirodirdjo et al, 2000;Sieh and Natawidjaja, 2000;Natawidjaja and Triyoso, 2007;Nakano et al, 2010;Weller et al, 2012;Ito et al, 2016;Bradley et al, 2017). Overall, most (>80%) of the GSF consists of a narrow (a very few km wide) zone of deformation along a main dextral segment; limited parts (<20%) of the GSF may show offset segments, overlapping at times, or may be only inferred (Sieh and Natawidjaja, 2000, and references therein).…”

Section: Tectonic Setting Of Sumatramentioning

confidence: 99%

“…The GSF propagated southwards, in central-southern Sumatra, from ∼2 Ma (Figure 1; Sieh and Natawidjaja, 2000). It is usually active as a vertical plane down to depths of ∼15 km, as revealed by the associated seismicity arriving nearly to the base of the considerably brittle crust (e.g., Widiwijayanti et al, 1996;Genrich et al, 2000;Natawidjaja and Triyoso, 2007;Weller et al, 2012). No information is available on the continuation of the GSF within the ductile crust, even though recent studies in similar tectonic settings (South Chile subduction zone) suggest a curving of the fault at depth (Catalan et al, 2017).…”

Section: Tectonic Setting Of Sumatramentioning

confidence: 99%

“…Indeed, despite the general spatial coincidence between the location of strike-slip faulting (along the dextral Great Sumatra Fault, or GSF) and volcanic activity, there are very limited data describing the local structural control on volcanism: knowledge gaps include the definition of the existence, configuration, shape and size of the magmatic systems, the definition of the relationships between the main tectonic structures and the rise, emplacement and eruption of magma. Also, the presence of large magmatic systems, as below the huge Toba caldera, lying a few tens of km to the east of the GSF (see section below; Genrich et al, 2000) constitutes a puzzling context to explain any structural control on volcanic activity. Therefore, more studies are needed to evaluate the detailed relationships between the development of GSF and the volcanoes on Sumatra.…”

Section: Introductionmentioning

confidence: 99%

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Weak Tectono-Magmatic Relationships along an Obliquely Convergent Plate Boundary: Sumatra, Indonesia

et al. 2018

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The tectono-magmatic relationships along obliquely convergent plate boundaries, where strain partitioning promotes strike-slip structures along the volcanic arc, are poorly known. Here it is unclear if and, in case, how the strike-slip structures control volcanic processes, distribution and size. To better define the possible tectono-magmatic relationships along strike-slip arcs, we merge available information on the case study of Sumatra (Indonesia) with field structural data. The Sumatra arc (entire volcanic belt) consists of 48 active volcanoes. Of these, 46% lie within 10 km from the dextral Great Sumatra Fault (GSF), which carries most horizontal displacement on the overriding plate, whereas 27% lie at >20 km from the GSF. Among the volcanoes at <10 km from GSF, 48% show a possible structural relation to the GSF, whereas only 28% show a clear structural relation, lying in pull-aparts or releasing bends; these localized areas of transtension (local extensional zone) do not develop magmatic segments. There is no relation between the GSF along-strike slip rate variations and the volcanic productivity. The preferred N30 • -N40 • E volcano alignment and elongation are subparallel to the convergence vector or to the GSF. The structural field data, collected in the central and southern GSF, show, in addition to the dextral motions along NW-SE to N-S striking faults, also normal motions (extending WNW-ESE or NE-SW), suggesting local reactivations of the GSF. Overall, the collected data suggest a limited tectonic control on arc volcanism. The tectonic control is mostly expressed by the mean depth of the slab surface below the volcanoes (130 ± 20 km) and, subordinately, local extension along the GSF. The latter, when WNW-ESE oriented (more common), may be associated with the overall tectonic convergence, as suggested by the structural data; conversely, when NE-SW oriented (less common), the extension may result from co-and post-seismic arc normal extension, as supported by the 2004 mega-earthquake measurements. Overall, the strike-slip arc of Sumatra has intermediate features between those of extensional and contractional arcs.

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Section: Tectonic Setting Of Sumatramentioning

confidence: 99%

Section: Tectonic Setting Of Sumatramentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Weak Tectono-Magmatic Relationships along an Obliquely Convergent Plate Boundary: Sumatra, Indonesia

et al. 2018

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“…This region is known to have experienced several damaging earthquakes in the past, some of which have generated tsunami with considerable impact (Zhou et al, 2002;Ortiz and Bilham, 2003;Verma et al, 1978). The subduction tectonics of the Andaman arc region, with regard to characteristics and rates of subduction in the region, have been studied by Dasgupta et al (2003), Neilsen et al (2004), Genrich et al (2000), McCaffrey et al (2000), Bettinelli et al (2006), Socquet et al (2006) and Lay et al (2005).…”

Section: Seismotectonic Scenarios In Andaman-nicobar Regionmentioning

confidence: 99%

Transient postseismic mantle relaxation following 2004 Sumatra earthquake: implications of seismic vulnerability in the Andaman-Nicobar region

Reddy

Prajapati

Sunil

et al. 2012

Nat. Hazards Earth Syst. Sci.

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Abstract. Throughout the world, the tsunami generation potential of some large under-sea earthquakes significantly contributes to regional seismic hazard, which gives rise to significant risk in the near-shore provinces where human settlements are in sizeable population, often referred to as coastal seismic risk. In this context, we show from the pertinent GPS data that the transient stresses generated by the viscoelastic relaxation process taking place in the mantle is capable of rupturing major faults by stress transfer from the mantle through the lower crust including triggering additional rupture on the other major faults. We also infer that postseismic relaxation at relatively large depths can push some of the fault segments to reactivation causing failure sequences. As an illustration to these effects, we consider in detail the earthquake sequence comprising six events, starting from the main event of M w = 7.

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“…Arah pergerakan tersebut sesuai dengan pergerakan Pulau Jawa sekarang [17]. Secara umum analisis terhadap pergerakan didominasi arah tenggara yang merupakan gambaran kondisi deformasi terkini.…”

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Identifikasi Patahan Menggunakan Analisis Data Deformasi Tanah di Tapak RDE Serpong

Suntoko

Sriyana

2017

EKSPLORIUM

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ABSTRAKTapak Reaktor Daya Eksperimental (RDE) terletak di Serpong berjarak ± 67 km dari sesar aktif Cimandiri. Hasil evaluasi tapak menunjukkan bahwa tapak RDE layak dan aman dari patahan aktif. Namun, diperlukan pemantauan deformasi batuan menggunakan alat Global Positioning System (GPS). Tujuannya adalah mendapatkan koordinat teliti melalui data GPS untuk mengidentifikasi ada tidaknya aktivitas patahan dan pengaruh patahan terhadap tapak. Pemantauan menggunakan konfigurasi enam titik ukur yang memotong jalur yang diduga sebagai patahan berarah tenggara-baratlaut. Metode penelitian menggunakan pendataan koordinat titik stasiun GPS berkala BATAN dan titik stasiun GPS kontinyu BIG dalam radius 25 km. Pengolahan data menggunakan perangkat lunak Bernese Versi 5.2 dilakukan secara radial dari titik stasiun 1 sebagai titik referensi dan dilanjutkan intepretasi data. Hasil analisis menunjukkan bahwa kondisi patahan/tektonik sekitar tapak RDE berada di kisaran 0,05 mikrostrain yang merupakan daerah dengan kondisi tektonik stabil. Kata kunci: GPS, patahan, evaluasi tapak, deformasi ABSTRACT Experimental Power Reactor (EPR) site is located in Serpong and it has a distance of ± 67 km from the Cimandiri active fault. Result of EPR site evaluation show that it is feasible and safe from the active fault. However, it is necessary to monitor the rock deformation by using Global Positioning System(GPS) tool. The goal is to obtain precise coordinates through GPS data to identify the presence of active fault activity and its impact on

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Distribution of slip at the northern Sumatran fault system

Cited by 137 publications

References 35 publications

Weak Tectono-Magmatic Relationships along an Obliquely Convergent Plate Boundary: Sumatra, Indonesia

Weak Tectono-Magmatic Relationships along an Obliquely Convergent Plate Boundary: Sumatra, Indonesia

Transient postseismic mantle relaxation following 2004 Sumatra earthquake: implications of seismic vulnerability in the Andaman-Nicobar region

Identifikasi Patahan Menggunakan Analisis Data Deformasi Tanah di Tapak RDE Serpong

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