Analyzing Seismic Destructive Effect to the Submarine Rock and Soil Layers According to Submarine Seismic Records

2012 ◽  
Vol 166-169 ◽  
pp. 2494-2506
Author(s):  
Bang Hua Zhang ◽  
Hong Shui Tian
Keyword(s):  
Fault Zone ◽  
Tensile Deformation ◽  
Seismic Action ◽  
Destructive Effect ◽  
Soil Layers ◽  
Seismic Fault ◽  
Seismic Records ◽  
Marine Facies ◽  
Combined Action ◽  
Rock And Soil

By means of survey and study, various submarine seismic records were identified in the marine facies strata from Sinian Period to Ordovician Period in Tancheng-Lujiang seismic fault zone and its vicinity. These submarine seismic records are divided into two classes. According to the mode of seismic action, every class of submarine seismic records is divided into three to four types. On the basis of classification, this paper studied and summarized seismic destructive effects to the submarine rock and soil layers and diagrammatized mechanism and process of seismic destructive effects. Seismic destructive effects to soft sedimentary soil strata mainly include seismic vibratory liquefaction, vibratory thixotropic effect, seismic fold deformation, sliding deformation, tensile deformation and combined action of shaking and weight. Seismic destructive effects to submarine soil strata of semi-consolidated to un-completely consolidated sediments mainly include syn-sedimentary fault effect, crack and smashing effect, filling effect of seismic crack, etc.

scholarly journals Numerical modelling technique for predicting the seismic fault zone (SFZ) in the earthquakes affected area, NW Himalayas with its neotectonic implication

1970 ◽  
Vol 2 (2) ◽  
pp. 57-65
Author(s):  
M Farhad Howladar ◽  
Sharmin Afroz ◽  
Shofiqul Islam
Keyword(s):  
Fault Zone ◽  
Numerical Technique ◽  
Strain Analysis ◽  
Normal Fault ◽  
Focal Mechanism Solution ◽  
Mathematical Form ◽  
Finite Elements Analysis ◽  
Nw Himalaya ◽  
Potential Region ◽  
Seismic Fault

Finite elements analysis is a powerful tool, often used for analyzing problems on stress, that can be successfully employed to analyze the finite deformation of geological structures in a mathematical form on a digital computer. Over the last century, great earthquakes with magnitudes of 7->8 have struck in the NW Himalaya; the 1905 Kangra earthquake is one of them. This study performed a plane strain analysis of failure stress and faults in these earthquakes potential region based on the seismic geologic cross profile employing the two-dimensional finite element method under elastic material state with Mohr Coulomb failure criterion. The results show that the normal fault initiates at deeper level, whereas with increasing convergent displacement the thrust fault appears in the shallower region. The results of the simulation are compared with the available seismic and earthquakes focal mechanism solution data of the area which shows the close similarities between the distribution of simulated fault and microseismicity in the deeper region of Chamba Nappe (CN) and along the upper part of the Mid Crustal Ramp (MCR) which might be the Seismic Fault Zone (SFZ) of the region. Moreover, the intense localization of faults along the frontal part of the model indicates that this part is active in nature at present, which is responsible for the neotectonics in the Himalayas. Keywords: NW Himalaya; numerical technique; seismic fault zone; neotectonics DOI: 10.3329/jles.v2i2.7499 J. Life Earth Sci., Vol. 2(2) 57-65, 2007  

Response Analysis of Bridge across Seismic Fault Zone

2012 ◽  
Vol 178-181 ◽  
pp. 2224-2227
Author(s):  
Qi Zhen Li ◽  
Hong Quan Li ◽  
Zhi Qian Zhang
Keyword(s):  
Fault Zone ◽  
Bridge Pier ◽  
Additional Stress ◽  
Response Analysis ◽  
Geological Condition ◽  
Structure Model ◽  
Bridge Structure ◽  
Continuous Beam ◽  
Seismic Fault ◽  
Deformation Law

Through simulating the happening location of the fault zone, the structure model is duly simplified, analysing the forced deformation law of the bridge surface with different fault zone position. Because of statically indeterminate structure, continuous beam shall be produced larger additional moment, shear force and torque as a result of displacement in bridge pier, additional stress will be increased with the the increasement of fault zone displacement, especially for the top surface parts of bridge pier. Hence, the corresponding position of the structure and construction measures for reinforcement should strengthened, the overall rigidity of the structure should be improved, and based on the study of the bridge across the fault zone is a simplified, and the actual stress process may be more complex, the investigation on geological condition must be clear, and avoid the bridge structure crossing fault zone.

scholarly journals High-resolution Imaging of Fault Zone Structures with Seismic Fault Zone Waves

2007 ◽  
Vol SpecialIssue ◽  
pp. 78-79 ◽  
Author(s):  
Y. Ben-Zion ◽  
Z. Peng ◽  
M. Lewis ◽  
J. McGuire
Keyword(s):  
High Resolution ◽  
Fault Zone ◽  
High Resolution Imaging ◽  
Seismic Fault ◽  
Resolution Imaging ◽  
Fault Zone Structures ◽  
Fault Zone Waves

No abstract available. <br><br> doi:<a href="http://dx.doi.org/10.2204/iodp.sd.s01.23.2007" target="_blank">10.2204/iodp.sd.s01.23.2007</a>

Seismic fault zone trapped noise

2014 ◽  
Vol 119 (7) ◽  
pp. 5786-5799 ◽  
Author(s):  
G. Hillers ◽  
M. Campillo ◽  
Y. Ben-Zion ◽  
P. Roux
Keyword(s):  
Fault Zone ◽  
Seismic Fault

The 2003 Bam Urban Earthquake: A Predictable Seismotectonic Pattern along the Western Margin of the Rigid Lut Block, Southeast Iran

2005 ◽  
Vol 21 (1_suppl) ◽  
pp. 35-99 ◽  
Author(s):  
Manuel Berberian
Keyword(s):  
Active Faults ◽  
Big Bang ◽  
Potential Threat ◽  
Western Margin ◽  
Seismic Fault ◽  
Lut Block ◽  
Ancient City ◽  
Seismic Records ◽  
Silk Worm ◽  
The Impact

“…King Ardeshir Babakan Sassanid [r. AD 224-241], by conquering Kerman and Bam, killed the ‘Kerm-e-Haftvad’ [the Haftvad Silk Worm] at the Bam Citadel. The gigantic worm burst with a big bang noise, which rocked the area, completely destroyed the Bam Citadel, and killed most of the inhabitants of the Citadel. King Ardeshir put an end to the rule of governor Haftvad, built the new village of Kolalan/Kojaran [Kurzan; the old Deh Shotor quarter in west Bam], and brought the ‘seven sacred fires of Bahram’ to the new village…”[Book of Deeds of Ardashir Pabagan 1878 (English Tr., original version ca. AD 272); Tabari 915; Ferdowsi Tusi 1010; & Mostaufi Qazvini 1340. The entire episode rests on the rationalization of historical events of unknown nature, and perhaps the legendary element could be a possible, mixed metaphoric reference to a ‘destructive earthquake’ or even a ‘conquering battle’ against the ancient city of Bam and its Parthian governor, Haftvad!]The impact of the Bam urban earthquake of 26 December 2003 (Mw6.6) was far more devastating than that which would be expected from a moderate-magnitude earthquake. The event followed a predictable geological/seismological pattern of a specially clustered sequence of medium- to large- magnitude earthquakes on tectonically related active faults in a region with historic slip deficits along the western margin of the rigid Lut block. The earthquake was accompanied by the coseismic rupture of sub-parallel strike-slip faults in a zone revealing a pattern of temporal clustering of seismicity, loading of adjacent faults, and a southwards progressing trend of earthquakes from the Kuh Banan to the Gowk and the Bam fault systems. As with the Agadir, Morocco, earthquake of 1960, and the great Tangshan, China, earthquake of 1976, the Bam urban earthquake painfully demonstrated the growing vulnerability of a city built on or adjacent to a seismic fault, unprepared to be tested by the severe ground motion triggered by a medium magnitude earthquake. The absence of historical seismic records regarding the occurrence of earthquakes in the region or the lengthy time spans between such disasters has been erroneously interpreted as a lack of any potential threat for the last 2,500 years in the city of Bam.

scholarly journals Geochemistry of soil gas in the seismic fault zone produced by the Wenchuan Ms 8.0 earthquake, southwestern China

2010 ◽  
Vol 11 (1) ◽  
Author(s):  
Xiaocheng Zhou ◽  
Jianguo Du ◽  
Zhi Chen ◽  
Jianwu Cheng ◽  
Yi Tang ◽  
...  
Keyword(s):  
Fault Zone ◽  
Soil Gas ◽  
Southwestern China ◽  
Seismic Fault ◽  
Wenchuan Ms 8.0 Earthquake

Earthquake source parameters at the sumatran fault zone: Identification of the activated fault plane

2010 ◽  
Vol 2 (4) ◽  
Author(s):  
Madlazim Kasmolan ◽  
Bagus Santosa ◽  
Jonathan Lees ◽  
Widya Utama
Keyword(s):  
Fault Zone ◽  
Moment Tensor ◽  
Source Parameters ◽  
Earthquake Source ◽  
Joint Analysis ◽  
Seismic Fault ◽  
Earthquake Source Parameters ◽  
Sumatran Fault ◽  
Centroid Position

AbstractFifteen earthquakes (Mw 4.1–6.4) occurring at ten major segments of the Sumatran Fault Zone (SFZ) were analyzed to identify their respective fault planes. The events were relocated in order to assess hypocenter uncertainty. Earthquake source parameters were determined from three-component local waveforms recorded by IRIS-DMC and GEOFON broadband lA networks. Epicentral distances of all stations were less than 10°. Moment tensor solutions of the events were calculated, along with simultaneous determination of centroid position. Joint analysis of hypocenter position, centroid position, and nodal planes produced clear outlines of the Sumatran fault planes. The preferable seismotectonic interpretation is that the events activated the SFZ at a depth of approximately 14–210 km, corresponding to the interplate Sumatran fault boundary. The identification of this seismic fault zone is significant to the investigation of seismic hazards in the region.

scholarly journals The Stress-Strain State of the Tunnel Lining that Crosses the Fault Zone of Soil Blocks during an Earthquake

2022 ◽  
Vol 24 (1) ◽  
pp. D9-D22
Author(s):  
Mark R. Miller ◽  
Evgeniy Y. Titov ◽  
Sergey S. Kharitonov ◽  
Yong Fang
Keyword(s):  
Fault Zone ◽  
Analytical Method ◽  
Strain State ◽  
Numerical Solutions ◽  
Numerical Models ◽  
Soil Mass ◽  
Tunnel Lining ◽  
Soil Layers ◽  
Internal Forces ◽  
Surrounding Soil

The study examines the question of the tunnel behavior under seismic or geophysical load in the zone of changes in the hardness of the surrounding soil mass. In the course of the study, the internal forces and displacements arising in the structure of a tunnel in the zone of intersection of the boundaries of soil layers with different properties, in the case when these layers move relative to each other, were determined by analytical and numerical solutions. The data obtained by the analytical method was compared to numerical models using practical examples.

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