Tectonic stress state in NE Japan as part of the Okhotsk plate

2001 ◽  
Vol 339 (3-4) ◽  
pp. 311-329 ◽  
Author(s):  
Sungat Altis
Keyword(s):  
Stress State ◽  
Tectonic Stress ◽  
Okhotsk Plate ◽  
Ne Japan

Study on the Influence of Seepage Behavior of Dam Foundation during Wenchuan Earthquake

2011 ◽  
Vol 255-260 ◽  
pp. 3642-3645
Author(s):  
Kai Hua Zeng ◽  
Hai Yan Ju ◽  
Han Xing Peng
Keyword(s):  
Stress State ◽  
Wenchuan Earthquake ◽  
Groundwater Level ◽  
Tectonic Stress ◽  
Seepage Water ◽  
Dam Foundation ◽  
Strong Earthquakes ◽  
Main Effect ◽  
Small Decline ◽  
Shrinkage Property

Earthquake occurred on May 12, 2008 in Wenchuan, Sichuan Province, China, with magnitude of 8.0 and epicenter intensity of VI. Chencun hydropower station in southern Anhui Province has been shocked strongly during Wenchuan Earthquake, which stations 1,500 km away from Wenchuan. Tectonic stress caused by strong earthquakes inevitably led to the changes of stress state, groundwater level and pore pressure in the dam foundation. Seepage water level observation of the dam foundation had been encrypted immediately. According to the experimental data, it was conformed that significant effects were displayed on the dam foundation seepage because of Wenchuan earthquake, shunhe fault near dam sites was the main effect zone of earthquake tectonic stress, the downrange of groundwater depth was self-evident. As the existence of acrylamide curtain, swelling-shrinkage property of the acrylamide gel restricted the change of groundwater level and rock stress state in the dam foundation caused by seismic tectonic stress; the groundwater level behind the acrylamide curtain had a small decline, and recovering quickly.

scholarly journals TESTING THE EFFECT OF UNDERMINING ON POSITIONAL ACCURACY OF THE DIGITAL TECHNICAL MAP OF OSTRAVA IN THE PŘÍVOZ CADASTRAL DISTRICT / PŘÍVOZ KADASTRINIO RAJONO ĮTAKOS OSTRAVOS SKAITMENINIO TECHNINIO ŽEMĖLAPIO POZICINIAM TIKSLUMUI PADARINIŲ TYRIMAS / АНАЛИЗ ВЛИЯНИЯ РАЗРУШАЮЩИХ СИЛ НА ПОЗИЦИОННУЮ ТОЧНОСТЬ ЦИФРОВОЙ ТЕХНИЧЕСКОЙ КАРТЫ Г. ОСТРАВА В КАДАСТРОВОМ РАЙОНЕ ПРИВОЗ

2011 ◽  
Vol 37 (3) ◽  
pp. 111-118
Author(s):  
Milan Mikoláš ◽  
Jiří Žváček ◽  
Michal Vaněk ◽  
Roman Donocik ◽  
Petra Zápalková ◽  
...  
Keyword(s):  
Rock Mass ◽  
Stress State ◽  
Coal Mining ◽  
Tectonic Stress ◽  
Surrounding Rock ◽  
Recent Past ◽  
Positional Accuracy ◽  
Landscape Morphology ◽  
The Town ◽  
Town Area

Intensive underground exploitation took place in the area of the Ostrava corporate town in recent past. After the coal mining was shut down in 1994 gradual subsidence in the town area has slowed down, however, establishing of the Digital Technical Map of Ostrava (DTMMO) dates back to 1992. When working a seam the original geostatic and tectonic stress state in the surrounding rock mass changes, which is accompanied by rock transformation and displacement from the roof towards the stope. Undermining is manifested in landscape morphology in many different ways that we can divide to continuous and discontinuous deformations. Residual mining effects could therefore have impacted positional accuracy of DTMMO in the last 18 years. The Bohumín 8-9/43 topographic sheet was selected for testing purposes in the Přívoz cadastral district. Santrauka Netolimoje praeityje Ostravos, miesto Čekijos rytuose, savivaldybėje buvo intensyviai eksploatuojama žemė. Nustojus užsiiminėti angliakasyba, nuo 1994-ųjų, palaipsnis žemės smukimas miesto vietovėse sulėtėjo. Skaitmeninis techninis Ostravos žemėlapis (DTMMO) sukurtas dar 1992 metais. Vykstant darbams žemės tarpsluoksnyje pirminis geostatinis ir tektoninis slėgis aplinkinėje uolienų masėje keitėsi, ir tai lėmė uolienų transformaciją ir slinktį. Kraštovaizdžio morfologijoje žala pasireiškia įvairiais būdais. Skiriama nenutrūkstamoji ir nutrūkstamoji deformacijos. Liekamasis kasybos poveikis per pstaruosius 18 metų galėjo paveikti pozicinį DTMMO tikslumą. Tiriant Přívoz kadastrinį rajoną, pasirinkta Bohumín 8-9/43 topografinio žemėlapio lapas. Резюме В недавнем прошлом в районе корпоративного г. Острава интенсивно эксплуатировались нижние слои грунта. После прекращения добычи угля в 1994 г. постепенное оседание поверхности города замедлилось. Созданная цифровая техническая карта г. Остравы (DTMMO) восходит к 1992 г. При работе с пластом возникающее исходное геостатическое и тектоническое возбуждение приводит к изменениям в окружающих пласт горных массивах, которые сопровождаются преобразованием пород и перемещениями в направлении забоя. Разрушение проявляется в морфологии ландшафта в самых разных формах, которые можно подразделить на непрерывные и разрывные деформации. Поэтому остаточные явления горных разработок могут оказывать влияние на позиционную точность DTMMO за последние 18 лет. Для анализа была выбрана топографическая плита Богумин 8-9/43 в кадастровом районе Привоз.

scholarly journals Mechanical models to estimate the paleostress state from igneous intrusions

Solid Earth ◽  
2018 ◽  
Vol 9 (4) ◽  
pp. 847-858 ◽  
Author(s):  
Tara L. Stephens ◽  
Richard J. Walker ◽  
David Healy ◽  
Alodie Bubeck ◽  
Richard W. England
Keyword(s):  
Stress State ◽  
Tectonic Stress ◽  
Fracture Plane ◽  
Brittle Deformation ◽  
Deformation History ◽  
Deformation Structures ◽  
Igneous Intrusions ◽  
Vertical Opening ◽  
Mechanical Models ◽  
San Rafael

Abstract. Dikes and sills represent an important component of the deformation history in volcanic systems, but unlike dikes, sills are typically omitted from traditional paleostress analyses in tectonic studies. The emplacement of sheet intrusions is commonly associated with Mode I fracturing in a low deviatoric stress state, in which dilation is perpendicular to the fracture plane. Many natural examples of sills and dikes, however, are observed to accommodate minor shear offsets, in addition to a component of dilation. Here we present mechanical models for sills in the San Rafael subvolcanic field, Utah, which use field-based measurements of intrusion attitude and opening angles to constrain the tectonic stress axes during emplacement and the relative magma pressure for that stress state. The sills display bimodal dips to the NE and SW and consistent vertical opening directions, despite variable sill dips. Based on sill attitude and opening angles, we find that the sills were emplaced during a phase of NE–SW horizontal shortening. Calculated principal stress axes are consistent (within ∼ 4°) with paleostress results for penecontemporaneous thrust faults in the area. The models presented here can be applied to any set of dilational structures, including dikes, sills, or hydrous veins, and represent a robust method for characterising the paleostress state in areas where other brittle deformation structures (e.g. faults) are not present.

Upper plate tectonic stress state may influence interseismic coupling on subduction megathrusts

Geology ◽  
2012 ◽  
Vol 40 (10) ◽  
pp. 895-898 ◽  
Author(s):  
L. M. Wallace ◽  
A. Fagereng ◽  
S. Ellis
Keyword(s):  
Stress State ◽  
Tectonic Stress ◽  
Plate Tectonic ◽  
Interseismic Coupling

Rupture propagation in strong earthquake sources and tectonic stress field

2013 ◽  
Vol 184 (4-5) ◽  
pp. 335-346 ◽  
Author(s):  
Yu. L. Rebetsky ◽  
R.E. Tatevossian
Keyword(s):  
Stress State ◽  
Strong Earthquake ◽  
High Stress ◽  
Confining Pressure ◽  
Tectonic Stress ◽  
Earthquake Source ◽  
Earthquake Sources ◽  
High Gradients ◽  
Maximal Shear Stress ◽  
Essential Heterogeneity

Abstract Problems of physical basis of earthquake source mechanics are discussed. Results of stress state reconstruction based on the cataclastic analysis of discontinuous dislocations in some seismotectonic active earth crust domains are presented. Common features of the stress state in areas of preparation of strong earthquake in this century are revealed. It is demonstrated that the distribution of the effective isotropic pressure and of the maximal shear stress in areas of earthquake source preparation is characterized by essential heterogeneity. The main part of the source is always associated to crust domain under low effective confining pressure. Specific role of crust domains characterized by high stress gradients is recognized. The nucleation point of the earthquake is usually associated to such domains. Based on some strong earthquake case studies it is demonstrated that usually the rupture propagates from the region of high gradients of stresses toward the crust domains characterized by low effective compression.

scholarly journals 3D in-Situ Stress Model of Upper Tamakoshi Hydroelectric Project Area

2017 ◽  
Vol 21 ◽  
pp. 34-41
Author(s):  
Chhatra Bahadur Basnet ◽  
Krishna Kanta Panthi
Keyword(s):  
Stress State ◽  
Three Dimensional ◽  
Tectonic Stress ◽  
In Situ Stress ◽  
Tectonic Activity ◽  
Hydroelectric Project ◽  
Headrace Tunnel ◽  
Detailed Assessment ◽  
Area Of Concern

Reliable estimation of in-situ stress state is very important in implementing the shotcrete lined/ unlined tunnels and shafts. The in-situ stress state of the area of concern is mainly governed by the gravity-induced stress, tectonic activity of the earth’s crust and topographic condition of that area. The local tectonic and geological environment such as faulting and shearing activities in general influences the magnitude of tectonic stress level. The Himalayan region is renowned with its active tectonic movement (earthquake activities), which causes accumulation and sudden release of strain energy instigating changes in the stress environment. This paper aims to evaluate in-situ stress state at the Upper Tamakoshi Hydroelectric Project, where shotcrete lined/ unlined headrace tunnel with considerable hydrostatic head is being implemented. A detailed assessment of the in-situ stress state is carried out by using both measured data and three-dimensional numerical analysis using FLAC3D. HYDRO Nepal JournalJournal of Water Energy and EnvironmentIssue: 21, July, 2017Page: 34-41Upload Date: July 18, 2017

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