Nature and onset age of neotectonic regime in the northern core of Isparta Angle,SW Turkey     

Ali Koçyiğit  Şule Gürboğa  Doğan Kalafat 《Geodinamica Acta》2013,26(1-2):52-85

The Isparta Angle (IA) is a reverse Λ-shaped morphotectonic structure located to the north of Antalya Gulf in the Eastern Mediterranean Sea. It resulted from the northward curvature of the originally E–W-trending Tauride orogenic belt owing to the nappe emplacements and related clockwise and anti-clockwise rotations in a time period of Early Paleocene to Early Pliocene. The IA is included in the southwest Anatolian tensional neotectonic domain and characterized by a series of grabens and horsts bounded by active normal faults of dissimilar length and trend. The evolutionary history of the graben-horst system is episodic. It is evidenced by two graben fills. These are older and modern (younger) graben fills separated by an intervening angular unconformity. The modern graben fill is nearly flat-lying (non-deformed) whereas older graben fill was deformed into a series of anticlines and synclines with ENE-trending curvi-linear axes by a short-term compressive tectonic regime operated in NNW–SSE direction during Late Pliocene. The diagnostic structures taking a part in the development of grabens and shaping the northern section of the IA are the margin-boundary normal faults. They occur in numerous single and several fault zones displaying a basin ward facing step-like land shape. Most of fault segments, particularly the master faults, are active and have a capacity of creating destructive earthquakes with a magnitude (up to Mw?=?7.0). This is evidenced by both the historical and instrumental period earthquakes. Both the focal mechanism solution of earthquakes and the stereographic plots of slip-plane data, measured on the active margin-boundary faults of various grabens comprising the IA, on the Schmidt lower hemisphere net obviously reveal that the IA is under the influence of the tensional neotectonic regime, not a compressive tectonic regime, i.e. the sinistral strike-slip shearing along the Pliny arc has not propagated yet onshore, and its commencement age is Early Quaternary.  相似文献   

Using Environmental Isotope Method to Study the Air Temperature Variations of the Earth     

Do Van Binh 《地下水科学与工程》2014,2(2):97-102

Using environmental isotopes to study the variations in air temperature is a relatively new method in Vietnam. This is a new and reliable method. Using environmental isotopes to study the temperature variations in the past and predict the future changes is a matter of being interested and applied. This paper used the results of isotope analysis (T, D, 18O, 13C and 14C) to study the change in temperature of the air environment in the past and then projected to 2050. From contents of isotopes, based on the correlation with temperature, water age we could calculate air temperature conditions in the past and predict future changes. Results from the study showed that about 500 years ago to present, air temperature in Red River area continuously rises and amplitude ranges from 0.05 to 0.06 °C /year. By 2030 the average temperature of the air environment will be 23.75 °C, by 2040 would be 24.10 °C and by 2050 is 25.20 °C  相似文献   

Methane Flux into the Atmosphere in the South China Sea     

Shakirov  R. B.  Yatsuk  A. V.  Mishukova  G. I.  Obzhirov  A. I.  Yugai  I. G.  Cuong  Do Huy  Lan  Nguyen Hong  Legkodimov  A. A.  Shakirova  M. V. 《Doklady Earth Sciences》2019,486(1):533-536

Doklady Earth Sciences - The regional gas geochemical profile was first performed in the South China Sea in the north–south direction in January 2017 (42nd cruise of the R/V Akademik Boris...  相似文献   

Crustal anisotropy in southwest Ireland from analysis of controlled source shear-wave data     

P.W. Readman  F. Hauser  B.M. O'Reilly  V.C. Do   《Tectonophysics》2009,474(3-4):571-583

Results from a travel-time analysis of three-component shear-wave (S-wave) data recorded in southwest Ireland during a controlled source seismic experiment have been used to investigate the magnitude of crustal anisotropy. The data used were recorded from 20 in-line shots on three-component short-period stations deployed at approximately 1-km spacing along two parallel profiles. Analysis of the travel-time differences between vertically and horizontally polarised S-waves recorded on vertical, radial and transverse seismometer components was undertaken using seismic phases travelling near the Earth's surface (S_g) and reflected from the Moho (S_mS). Travel-time differences between the components for both phases scatter largely within the range ± 0.2 s, which is about the uncertainty in the measurements, with no observed coherent variation with shot-receiver offset. Synthetic S-wave seismograms were also computed from 1-D S-wave velocity models with varying degrees of anisotropy in the upper and in the lower crusts. Travel-time differences of S_g and S_mS phases picked from these synthetic seismograms confirm that for anisotropies with probable symmetries of magnitude 1–2% in either the upper or lower crust should result in an observable variation of the travel-time differences between the transverse and radial, and transverse and vertical components with source–receiver offset. The study shows that crustal anisotropy does not contribute significantly to the marked anisotropy recently deduced from SKS and SKKS measurements in Ireland, which is therefore confirmed to reside at sub-crustal and deeper mantle levels.  相似文献   

Fish and ostracod remains from the Santos Basin (Cretaceous to Recent), Brazil     

C. Giles Miller  Martha Richter  Dermeval A. Do Carmo 《Geological Journal》2002,37(4):297-316

For the first time, ichthyoliths are described from the Santos sedimentary basin, offshore southern Brazil. Isolated teeth, dermal scales and the first documented otoliths from Cretaceous (Albian) to Recent cuttings from five wells are described. The following groups are represented: Chondrichthyans: Triakidae, Carcharhinidae; Ginglymostomatidae: ?Ginglymostoma sp., Lamnidae indet., Scyliorhinidae; Osteichthyans: Teleostei; Myctophiidae: Diaphus aff. splendidus sp. complex, Diaphus spp., Diaphus cf. garmani, Ceratoscopelus aff. warmingii; Sternoptychidae: Valenciennellus tripunctulatus, teeth of indeterminate Teleostei. The majority of these ichthyofossils represent extant forms, known to occur in the Atlantic Ocean, and are of potential value for stratigraphical correlations between oil‐yielding basins in the region. Ostracods are not well preserved but can be identified to generic level indicating marine environments. The ostracod faunas offer potential for intrabasinal correlation in the Eocene and Oligocene. Copyright © 2002 John Wiley & Sons, Ltd.  相似文献   

Factors affecting the stability of deep excavations in clay with consideration of a full elastoplastic support system     

Do  Tuan-Nghia  Ou  Chang-Yu 《Acta Geotechnica》2020,15(7):1707-1722

Acta Geotechnica - This study investigates the stability of internally braced excavations in thick, saturated clay using a finite element method with reduced shear strength. The support system was...  相似文献   

Effects of warming on microbial communities in the coastal waters of temperate and subtropical zones in the Northern Hemisphere,with a focus on Gammaproteobacteria     

Dao Thi Anh Tuyet  Toshinari Tanaka  Rumi Sohrin  Do Manh Hao  Kazuyo Nagaosa  Kenji Kato 《Journal of Oceanography》2015,71(1):91-103

  相似文献   

Practical control of underactuated ships     

K.D. Do 《Ocean Engineering》2010,37(13):1111-1119

This paper presents a design of global smooth controllers that achieve the practical stabilization of arbitrary reference trajectories, including fixed points and nonadmissible trajectories for underactuated ships. These ships do not have an independent actuator in the sway axis. The control design is based on several nonlinear coordinate changes, the transverse function approach, the back-stepping technique, the Lyapunov direct method, and utilization of the ship dynamics. Simulation results illustrate the effectiveness of the proposed control design.  相似文献   

Three-dimensional numerical simulation for mechanized tunnelling in soft ground: the influence of the joint pattern   总被引：1，自引：1，他引：0  

Ngoc-Anh Do  Daniel Dias  Pierpaolo Oreste  Irini Djeran-Maigre 《Acta Geotechnica》2014,9(4):673-694

The main purpose of this study was to provide a three-dimensional numerical model, which would allow the tunnel lining behaviour and the displacement field surrounding the tunnel to be evaluated. Most of the processes that occur during mechanized excavation have been simulated in this model. The influence of the lining joint pattern, including segmental lining joints and their connections, has in particular been taken into consideration. The impact of the processes during mechanized excavation, such as the grouting pressure and the jacking forces in the structural forces induced in the tunnel lining, has been presented. These values depend on the tunnel advancement. However, a negligible influence of the joint pattern on the ground displacement field surrounding the tunnel has been observed. Generally, a variation in the structural forces in successive rings along the tunnel axis has been found in a staggered segmental lining, indicating the necessity of simulating the joints in the tunnel lining and using a full three-dimensional numerical model to obtain an accurate estimation. In addition, the considerable influence of the coupling effect between successive rings on the lining behaviour has been highlighted.  相似文献   

Testing a conceptual hillslope recession model based on the storage–discharge relationship with the Richards equation     

Do‐Hun Lee 《水文研究》2007,21(23):3155-3161

The conceptual recession model based on the storage–discharge relationship was proposed to account for the unsaturated–saturated water storage interaction. The recession model was formulated by combining the constitutive storage–discharge relationship with the integral balance equation for unsaturated and saturated water storage. The functional form of the constitutive storage–discharge relationship was determined from the spatial integration of the Richards equation. The performance of the recession model was tested by comparing with the solution of the Richards equation for different simulation geometric shapes and soil types. The conceptual recession model incorporating the unsaturated–saturated water storage interaction was in good agreement with the recession response of the Richards equation. However, the recession model that neglected the unsaturated–saturated water storage interaction was comparable to the Richards equation only for soils with the weak interaction between unsaturated water storage and saturated water storage. This result suggests the important role of the unsaturated–saturated water storage interaction in the formulation of the recession process when the derivative of the functional relationship between the unsaturated water storage and saturated water storage becomes significant. Copyright © 2007 John Wiley & Sons, Ltd.  相似文献