PALEOSTRESS ANALYSIS TO INTERPRET THE LANDSLIDE MECHANISM: A CASE STUDY IN PARANGTRITIS, YOGYAKARTA

2015 ◽  
Vol 2 (2) ◽  
Author(s):  
Salahuddin Husein ◽  
Ignatius Sudarno ◽  
Subagyo Pramumijoyo ◽  
Dwikorita Karnawati
Keyword(s):  
Mass Movement ◽  
Western Boundary ◽  
Northern Boundary ◽  
Boundary Fault ◽  
Landslide Mechanism ◽  
Eastern Boundary ◽  
Sliding Mechanism ◽  
Main Fault ◽  
Paleostress Analysis

Paleostress analysis on the landslide boundary faults is able to explain the sliding mechanism. This method is particularly useful to study a paleolandslide. About 30 striated fault planes from the Parangtritis paleo-landslide, located in the Yogyakarta coastline, were analyzed to define their principle stress axes. The eastern boundary fault, named as the Girijati Fault, was the main fault responsible for the mass movement and leaving a considerable steep cliff. It moved normal in a left lateral sense with ENE – WSW extension and dragged the rockmass southward, creating a NNW – SSW extension along the Parangtritis Fault and turn it into the western boundary fault. The rockmass slided along the stratigraphic contact between the underlying Nglanggran Formation and the overlying Wonosari Formation, created a semi-circular crown cliff as the northern boundary and produced some isolated topographic highs of the thrust block near the toe. Keywords: Paleostress, landslide boundary, fault, paleolandslide

scholarly journals Burial Ages Imply Miocene Uplift of Lu Mountain in East China due to Crustal Shortening

2021 ◽  
Vol 9 ◽  
Author(s):  
Zhiyong Han ◽  
Rouxian Pan ◽  
Xusheng Li ◽  
Yujia Liu ◽  
Yufang Li ◽  
...  
Keyword(s):  
Hanging Wall ◽  
Vertical Displacement ◽  
East China ◽  
Western Boundary ◽  
Reverse Fault ◽  
Boundary Fault ◽  
Denudation Rates ◽  
Eastern Boundary ◽  
Field Evidence ◽  
Tectonic Style

Confined by the eastern and western boundary faults, Lu Mountain has long been considered a block mountain uplifted due to Mesozoic and Cenozoic crustal deformation in East China. However, the formation and evolution of this block mountain are still debated. In this study, the eastern boundary fault is investigated to confirm the tectonic style of the block mountain. In addition, the burial ages of sediments on the fans of the eastern piedmont are measured by 26Al/10Be dating to evaluate the denudation rate. Field evidence indicates the presence of a reverse fault (Xingzi reverse fault) acting as the eastern boundary fault, which demonstrates that the block mountain is not a horst as once thought but an extrusion structure. Corrected 26Al/10Be burial ages show that the sediments on the high-level fans were deposited at approximately 1.1–1.2 Ma, which indicates denudation rates ranging from 0.033 to 0.082 m/kyr. The vertical displacement along the Xingzi reverse fault is estimated to be at least 1,100 m. The hanging wall could have been eroded to its present position within 13–33 Myr at the above denudation rates. Combining our results with regional geological and geomorphological evidence, we suggest that Lu Mountain was mainly uplifted in the Miocene due to crustal compression deformation, which may have been a response to the movement of the Pacific plate.

Ages of carbonatites and other alkaline rocks in Quebec

1968 ◽  
Vol 5 (6) ◽  
pp. 1401-1407 ◽  
Author(s):  
Ronald Doig ◽  
Jackson M. Barton Jr.
Keyword(s):  
Northern Boundary ◽  
Alkaline Rocks ◽  
Continuous Structure ◽  
Boundary Fault ◽  
Igneous Activity ◽  
Lowland Area

Potassium-argon ages have been determined for alkaline rocks, including carbonatites, from some fifteen localities in Quebec. Nine centers of intrusion, including two previously documented localities, yield ages in the range 400 to 600 million years. All but two of these are located on or very near the northern boundary fault of the St. Lawrence graben system. Included in this group are four carbonatites with remarkably similar ages of intrusion (565 m.y.). The existence of this widespread coeval igneous activity along a 1200-mile segment of the lowland area and its westward extension supports the hypothesis that the St. Lawrence graben is a continuous structure, and indicates that the system has been active for at least 600 million years.

Analysis of shallow landslide mechanism of expansive soil slope under rainfall: a case study

2021 ◽  
Vol 14 (7) ◽  
Author(s):  
Chao Liang ◽  
Zhijian Wu ◽  
Xinfu Liu ◽  
Zhaomei Xiong ◽  
Tao Li
Keyword(s):  
Expansive Soil ◽  
Shallow Landslide ◽  
Soil Slope ◽  
Landslide Mechanism

scholarly journals Radiating Instability of a Meridional Boundary Current

2008 ◽  
Vol 38 (10) ◽  
pp. 2294-2307 ◽  
Author(s):  
Hristina G. Hristova ◽  
Joseph Pedlosky ◽  
Michael A. Spall
Keyword(s):  
Western Boundary ◽  
Far Field ◽  
Boundary Current ◽  
Important Conclusion ◽  
Western Boundary Currents ◽  
Horizontal Structure ◽  
Boundary Currents ◽  
Zonal Jets ◽  
Eastern Boundary ◽  
Eastern Boundary Current

Abstract A linear stability analysis of a meridional boundary current on the beta plane is presented. The boundary current is idealized as a constant-speed meridional jet adjacent to a semi-infinite motionless far field. The far-field region can be situated either on the eastern or the western side of the jet, representing a western or an eastern boundary current, respectively. It is found that when unstable, the meridional boundary current generates temporally growing propagating waves that transport energy away from the locally unstable region toward the neutral far field. This is the so-called radiating instability and is found in both barotropic and two-layer baroclinic configurations. A second but important conclusion concerns the differences in the stability properties of eastern and western boundary currents. An eastern boundary current supports a greater number of radiating modes over a wider range of meridional wavenumbers. It generates waves with amplitude envelopes that decay slowly with distance from the current. The radiating waves tend to have an asymmetrical horizontal structure—they are much longer in the zonal direction than in the meridional, a consequence of which is that unstable eastern boundary currents, unlike western boundary currents, have the potential to act as a source of zonal jets for the interior of the ocean.

The Connemara Eastern Boundary Fault: A correction

2017 ◽  
Vol 35 (1) ◽  
pp. 55-56
Author(s):  
Alan Lees ◽  
Martin Feely
Keyword(s):  
Boundary Fault ◽  
Eastern Boundary

V.—On the Exmoor Earthquake of January 23, 1894, and on its Relation to the Northern Boundary Fault of the Morte Slates

1896 ◽  
Vol 3 (12) ◽  
pp. 553-556
Author(s):  
Charles Davison
Keyword(s):  
Northern Boundary ◽  
Boundary Fault

A Slight earthquake of intensity IV, according to the Rossi-Forel scale, was felt in and near Exmoor at about 9 a.m. on January 23, 1894. Its interest lies, not so much in the seismic phenomena presented by it, as in its connection with the northern boundary fault of the Morte Slates.

scholarly journals Meridional Overturning Circulations Driven by Surface Wind and Buoyancy Forcing

2015 ◽  
Vol 45 (11) ◽  
pp. 2701-2714 ◽  
Author(s):  
Michael J. Bell
Keyword(s):  
Heat Loss ◽  
Water Mass ◽  
Surface Wind ◽  
Surface Heat ◽  
Meridional Overturning Circulation ◽  
Western Boundary ◽  
Eastern Boundary ◽  
Transformation Rates ◽  
Meridional Overturning ◽  
Water Mass Transformations

AbstractThe meridional overturning circulation (MOC) can be considered to consist of a downwelling limb in the Northern Hemisphere (NH) and an upwelling limb in the Southern Hemisphere (SH) that are connected via western boundary currents. Steady-state analytical gyre-scale solutions of the planetary geostrophic equations are derived for a downwelling limb driven in the NH solely by surface heat loss. In these solutions the rates of the water mass transformations between layers driven by the surface heat loss determine the strength of the downwelling limb. Simple expressions are obtained for these transformation rates that depend on the most southerly latitudes where heat loss occurs and the depths of the isopycnals on the eastern boundary. Previously derived expressions for the water mass transformation rates in subpolar gyres driven by the Ekman upwelling characteristic of the SH are also summarized. Explicit expressions for the MOC transport and the depths of isopycnals on the eastern boundary are then derived by equating the water mass transformations in the upwelling and downwelling limbs. The MOC obtained for a “single-basin” two-layer model is shown to be generally consistent with that obtained by Gnanadesikan. The model’s energetics are derived and discussed. In a world without a circumpolar channel in the SH, it is suggested that the upwelling limb would feed downwelling limbs in both hemispheres. In a world with two basins in the NH, if one of them has a strong halocline the model suggests that the MOC would be very weak in that basin.

THE HYDROCARBON POTENTIAL OF EXPLORATION PERMITS WA-299-P AND WA-300-P, CARNARVON BASIN: A CASE STUDY

2003 ◽  
Vol 43 (1) ◽  
pp. 339 ◽  
Author(s):  
M. Partington ◽  
K. Aurisch ◽  
W. Clark ◽  
I. Newlands ◽  
S. Phelps ◽  
...  
Keyword(s):  
Late Cretaceous ◽  
Hydrocarbon Potential ◽  
North West ◽  
The North ◽  
Alluvial Channel ◽  
Main Fault ◽  
Early Palaeozoic ◽  
Eastern Edge ◽  
Carnarvon Basin

Exploration permits WA-299-P and WA-300-P lie west of the North West Cape in a frontier part of the Carnarvon Basin where the largely Mesozoic Exmouth Sub-basin abuts against shallow Palaeozoic strata of the Gascoyne Platform. The only exploration well, within the permits, Pendock–1, penetrated a thin Valanginian Birdrong Sandstone unconformably overlying Carboniferous to Silurian units, so the Mesozoic hydrocarbon potential of the area is effectively untested.The structure of the area comprises a complex mosaic of NNE–SSW trending Early Palaeozoic extensional, listric growth faults, dissected by NW–SE trending Permian extension relay zones. Subsequent phases of Callovian– Oxfordian and Valanginian uplift, together with Late Cretaceous and Miocene inversion along the main fault zone, further complicate the structure. Several seismic events, some of which correlate with magnetic anomalies, are discordant with the local stratigraphy indicating a probable igneous origin.The primary targets are the Birdrong Sandstone and underlying Wogatti Formation, both of which host onshore oil accumulations at Rough Range and Parrot Hill–1. The retrogradational clastic shoreline facies of the Birdrong Sandstone is well known along the eastern edge of the Dampier–Barrow–Exmouth Sub-basins. The Wogatti Formation was deposited as a more restricted alluvial/ fluvial sheet sand facies, so far identified only in the onshore Cape Range area. Where the Jurassic is preserved, fluvial/alluvial channel sand facies of the Middle Jurassic Learmonth Formation, known onshore at Sandy Point–1, and Callovian nearshore sands, as observed in Unknown Hill–l, are expected to be important secondary targets.The most promising play types within the Southern Carnarvon Basin are dip and fault-dip closures at Birdrong/Wogatti level associated with Late Cretaceous reactivation of the main NE–SW listric faults, and accentuated by later Miocene compression. The most significant exploration risks are charge and the high risk of biodegradation of reservoired liquid hydrocarbons (critically linked to reservoir temperature).

scholarly journals Putney

1970 ◽  
Vol 3 (1) ◽  
pp. 52-62
Author(s):  
Gregory Blaxell
Keyword(s):  
Public School ◽  
Western Boundary ◽  
Language Group ◽  
Eastern Shore ◽  
Northern Boundary ◽  
Southern Boundary ◽  
Shopping Centre ◽  
Formed Part ◽  
The City ◽  
Additional Area

Putney is one of 16 suburbs that form the City of Ryde. Its western boundary is Church Street (but not including the properties facing Church Street) from the Parramatta River to Morrison Road. Morrison Road generally forms the northern boundary but an additional area has been added so that the Putney shopping centre and the Putney Public School are within Putney. The added area includes Parry Street to Acacia Street then a line drawn north to the southern boundary of Tyagarah Park. The eastern boundary is a line drawn in an almost southerly direction from the eastern end of Tyagarah Park to the eastern shore of Morrisons Bay.At the time of the arrival of Europeans at Sydney Cove in January 1788 the Wallumedegal or Wallumede were the traditional owners of the area that they called Wallumetta. This clan formed part of a large Dharug language group. 

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