scholarly journals Distribution of slip at the northern Sumatran fault system

2000 ◽  
Vol 105 (B12) ◽  
pp. 28327-28341 ◽  
Author(s):  
J. F. Genrich ◽  
Y. Bock ◽  
R. McCaffrey ◽  
L. Prawirodirdjo ◽  
C. W. Stevens ◽  
...  
Keyword(s):  
Fault System ◽  
Sumatran Fault

scholarly journals Co-seismic offsets due to two earthquakes (M w 6.1) along the Sumatran fault system derived from GNSS measurements

2016 ◽  
Vol 68 (1) ◽  
Author(s):  
Takeo Ito ◽  
Endra Gunawan ◽  
Fumiaki Kimata ◽  
Takao Tabei ◽  
Irwan Meilano ◽  
...  
Keyword(s):  
Fault System ◽  
Gnss Measurements ◽  
Sumatran Fault

Revisiting Toba Caldera: an insight from regional magnetotelluric data

2020 ◽  
Author(s):  
Lukman Sutrisno ◽  
Fred Beekman ◽  
Yunus Daud ◽  
Jan Diederik Van Wees
Keyword(s):  
Fault System ◽  
High Resistivity ◽  
Magnetotelluric Data ◽  
Recording Time ◽  
Magma Plumbing System ◽  
Basement Structures ◽  
Clay Cap ◽  
Surface Geology ◽  
Toba Caldera ◽  
Sumatran Fault

<p>Regional magnetotelluric (MT) survey had been conducted to image resistivity structures beneath Toba Caldera, Indonesia. A crustal-scale 2D inversion model is generated from ten MT stations with extended recording time, deployed along NE-SW regional line to cross perpendicularly both the Caldera and the nearby regional strike-slip fault system, the Sumatran Fault. High resistivity background is likely related to Palaeozoic rocks which is basement of the Tertiary sediments and the Quaternary volcanics. The most noticeable conductive anomaly is located between 10-20 km deep, interpreted as the main magma reservoir beneath the region. An intermediate, less than 10 km-deep, less conductive anomaly beneath the Caldera is interpreted as shallow magma chamber affected by the last major eruption. Shallow, less than 2 km-deep conductive layers are associated either with hydrothermal clay cap beneath the Caldera, or sedimentary formations of the nearby basins. Other conductive anomaly is spatially associated with the Sumatran Fault which located 15 km away from the Caldera. Parameter plots of some stations are consistent with the orientation of basement structures, while the others may be affected by more complex caldera structures. A conceptual model of magma plumbing system beneath the Caldera is then interpreted from the combination of regional resistivity structures, surface geology, and available seismic tomography.</p>

scholarly journals Imaging Rock Density Distribution beneath Liwa Fracture Zone in the Southern Part of the Great Sumatran Fault System, Indonesia

2016 ◽  
Vol 07 (04) ◽  
pp. 598-614 ◽  
Author(s):  
Djedi S. Widarto ◽  
Tedi Yudistira ◽  
Jun-Ichi Nishida ◽  
Ikuo Katsura ◽  
Eddy Z. Gaffar ◽  
...  
Keyword(s):  
Density Distribution ◽  
Fracture Zone ◽  
Fault System ◽  
Rock Density ◽  
Sumatran Fault

scholarly journals Updated Segmentation Model and Cummulative Offset Measurement of the Aceh Segment of the Sumatran Fault System in West Sumatra, Indonesia

2021 ◽  
Vol 5 (2) ◽  
pp. 84
Author(s):  
Aulia Kurnia Hady ◽  
Gayatri Indah Marliyani, Dr.
Keyword(s):  
Hazard Analysis ◽  
Fault System ◽  
Maximum Magnitude ◽  
Eurasian Plate ◽  
Fault Segment ◽  
Oblique Convergence ◽  
Fault Kinematics ◽  
Study Sites ◽  
The Right ◽  
Sumatran Fault

Sumatran fault in western Indonesia is one of the largest strike-slip fault in the world. The fault was formed as a result of the slip partitioning of the oblique convergence between the Indo-Australian and Eurasian plate along the Sunda trench. The right-lateral movement of the fault is accomodated by 19 fault segments that dissects the entire Sumatra island. We study the Aceh fault segment, which is located at the northernmost parts of the fault. The Aceh fault segment spans 250 km long passing through three districts: West Aceh, Pidie Jaya, and Aceh Besar and is affecting a total of ~546.143 population in the area. The current segmentation model assumes that Aceh fault segment acts as a single fault segment, which would generate closer to a M8 earthquake. This estimation is inconsistent with the ~M6-7 historical earthquake data. We conduct a detailed active fault mapping using the ~8 m resolution digital elevation model of DEMNAS and the sub-m DEM data from UAV-based photogrammetry to resolve the segmentation model of this fault. Our study indicate that the Aceh fault segment can be divided into 8 subsegments: Beutong, Kuala Tripa, Geumpang, Mane, Tangse, Jantho, Indrapuri, and Pulo Aceh. The fault kinematics identified in the field is consistent with right-lateral faulting. We measured cumulative displacement of geomorphic features (channels and ridges) ranging from 12.7 to 1931 m at some area. Findings of our study provide better estimation of the fault geometry and the maximum magnitude of potential earthquake along the Aceh fault segment as well as recommendation of prospective sliprate study sites. These informations are important for the development of seismic hazard analysis of the area.

scholarly journals Tectonic Controls of Volcanism and Complex Movements Along the Sumatran Fault System

1973 ◽  
Vol 6 ◽  
pp. 43-60 ◽  
Author(s):  
M. Posavec ◽  
◽  
D. Taylor ◽  
Th. van Leeuwen ◽  
A. Spector
Keyword(s):  
Fault System ◽  
Sumatran Fault

scholarly journals Analysis of fault patters based on erarthquake data on the land of Sumatera island

2021 ◽  
Vol 2126 (1) ◽  
pp. 012003
Author(s):  
A Basid ◽  
B Munir
Keyword(s):  
Spatial Planning ◽  
Strike Slip ◽  
Fault System ◽  
Reverse Fault ◽  
Fault Pattern ◽  
Geological Setting ◽  
The Many ◽  
Sumatran Fault ◽  
High Seismicity ◽  
Earthquake Data

Abstract Geodynamics of Sumatra is interesting to study because of the unique geological setting Geodynamics of Sumatra is interesting to study because of the unique geological setting and high seismicity. This high seismicity is caused by the many faults found on land and in the surrounding waters. This paper presents the results of research that aims to determine fault patterns both on land and in the waters around Sumatra based on earthquake data from 1960-2000. The area under study is at the coordinates of 6°N - 6°S and 95°E - 109°E at an epicenter depth of <60 km with a magnitude between 4-10. The area is divided into two zones, namely the front arc and the Barisan arc. Data were obtained from ISC and Global CMT. By using the Focal Mechanism Method, the results show that the fault pattern in the Sumatran forearc Basin zone is dominated by an Reverse Fault located in the accretion zone while on the mainland of Sumatra it is dominated by Strike Slip along the Sumatran Fault System. By knowing the position and pattern of the fault, especially on the mainland of the island of Sumatra, it can be used as a reference for spatial planning. In addition, further studies will also be able to learn about the dangers or disasters caused by the fault pattern.

scholarly journals Geological Lineament Pattern and Geomorphic Indices Characteristic Related To Geothermal Manifestation Appearance: A Case Study from Gunung Talang District and Its Surroundings, Solok Regency, West Sumatra Province, Indonesia

2021 ◽  
pp. 323-336
Author(s):  
Jordi Andrifa ◽  
Nana Sulaksana ◽  
Dewi Gentana ◽  
Murni Sulastri
Keyword(s):  
Hot Springs ◽  
Geological Structure ◽  
Fault System ◽  
Tectonic Activity ◽  
Geothermal System ◽  
Geomorphic Indices ◽  
Group I ◽  
West Sumatra ◽  
Sumatran Fault ◽  
Lineament Pattern

The study area is located in Gunung Talang District and its surroundings, Solok Regency, West Sumatra Province, Indonesia. This area has a potential volcanic geothermal system and is generally covered by the Quarternary rocks which are deformed due to the tectonic activity of the Sumatran Fault System. Geological structure traces are not well preserved in such an area. This study aims to determine the geological lineament pattern associated with geological structure, the geomorphic indices characteristic related to the tectonic activity and rock permeability, and the geothermal manifestation appearance based on these two factors. Geological lineament pattern is identified using the remote sensing method. Geomorphic indices characteristic is calculated through the quantitative analysis of bifurcation ratio (Rb), drainage density (Dd), mountain front sinuosity (Smf), and lineament density (Ld). Geothermal manifestation appearance is evaluated through geospatial analysis using the overlay method on the geological lineament pattern and the geomorphic indices characteristic, which are then correlated with the distribution of geothermal manifestations. The main geological lineament patterns associated with the geological structures in the study area are north-northwest–south-southeast (NNW-SSE) and northeast-southwest (NE-SW). These lineament patterns indicate synthetic and antithetic strike-slip faults around the Sumani Segment of Sumatran Fault System successively. The geomorphic indices characteristics imply deformed areas (Rb values: 1.14-5.45), rough (Dd values: 2.00-2.66 km/km2), moderate (Dd values: 3.14-4.00 km/km2), and slightly fine landform textures (Dd values: 4.32-5.51 km/km2), active (Smf values: 1.05-1.64) and moderate to slightly active tectonisms (Smf values: 1.74-2.52), low (Ld values: 0.00-0.84 km-1), moderate (Ld values: 0.84-1.68 km-1), and high lineament densities (Ld values: 1.68-2.52 km-1) over the study area. The geothermal manifestations in the study area are divided into four groups based on their appearance characteristics, namely group I (Songsang and Garara hot springs), group II (Padang Damar, Bukit Gadang, and Batu Bajanjang hot springs), group III (Bukit Kili and Bawah Gunuang hot springs), and group IV (Gabuo Atas and Bawah Betung hot springs).

scholarly journals Barrier Islands Resilience to Extreme Events: Do Earthquake and Tsunami Play a Role?

Water ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 178
Author(s):  
Ella Meilianda ◽  
Franck Lavigne ◽  
Biswajeet Pradhan ◽  
Patrick Wassmer ◽  
Darusman Darusman ◽  
...  
Keyword(s):  
Geographical Information Systems ◽  
Satellite Images ◽  
Morphological Changes ◽  
Barrier Islands ◽  
Geographical Information ◽  
Topographic Maps ◽  
Fault System ◽  
Storm Events ◽  
System 2 ◽  
Sumatran Fault

Barrier islands are indicators of coastal resilience. Previous studies have proven that barrier islands are surprisingly resilient to extreme storm events. At present, little is known about barrier systems’ resilience to seismic events triggering tsunamis, co-seismic subsidence, and liquefaction. The objective of this study is, therefore, to investigate the morphological resilience of the barrier islands in responding to those secondary effects of seismic activity of the Sumatra–Andaman subduction zone and the Great Sumatran Fault system. Spatial analysis in Geographical Information Systems (GIS) was utilized to detect shoreline changes from the multi-source datasets of centennial time scale, including old topographic maps and satellite images from 1898 until 2017. Additionally, the earthquake and tsunami records and established conceptual models of storm effects to barrier systems, are corroborated to support possible forcing factors analysis. Two selected coastal sections possess different geomorphic settings are investigated: (1) Lambadeuk, the coast overlying the Sumatran Fault system, (2) Kuala Gigieng, located in between two segments of the Sumatran Fault System. Seven consecutive pairs of comparable old topographic maps and satellite images reveal remarkable morphological changes in the form of breaching, landward migrating, sinking, and complete disappearing in different periods of observation. While semi-protected embayed Lambadeuk is not resilient to repeated co-seismic land subsidence, the wave-dominated Kuala Gigieng coast is not resilient to the combination of tsunami and liquefaction events. The mega-tsunami triggered by the 2004 earthquake led to irreversible changes in the barrier islands on both coasts.

scholarly journals Structure and kinematics of the Sumatran Fault System in North Sumatra (Indonesia)

2016 ◽  
Vol 693 ◽  
pp. 453-464 ◽  
Author(s):  
David Fernández-Blanco ◽  
Melody Philippon ◽  
Christoph von Hagke
Keyword(s):  
Fault System ◽  
North Sumatra ◽  
Sumatran Fault
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