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281.
为了调查羌塘盆地中部壳内低速层分布特征,对布设在羌塘盆地的TITAN-I宽频带地震台站所记录的远震波形数据进行接收函数分析,并引入时频域相位滤波技术改善接收函数信噪比,反演得到各台站下方100 km深度范围内的一维S波速度结构.结果表明,时频域相位滤波方法能够显著提高信噪比;羌塘盆地Moho深度为58±6 km,具有较高的泊松比值;中下地壳壳内低速层广泛分布,横向不连续,埋深在20~30 km,层厚6~12 km,剪切波速度为3.4±0.1 km/s;部分地区在埋深为10 km的中上地壳存在一层厚约4 km的低速薄层.羌塘盆地中下地壳壳内低速层是由于上涌的深部软流圈物质与下地壳发生大范围的接触,造成壳内及上地幔部分熔融引起的. 相似文献
282.
Although the Indus-Tsangpo Suture(ITS) is the most spectacular thrust system of continent-continent collision in the world, fundamental questions about its strength evolution and deformation behavior transition remain unanswered. Here we reported, for the first time, frictional melting-induced pseudotachylytes in the intensively deformed felsic rocks along the ITS zone in southern Tibet. This study reveals that pseudotachylytes induced profound weakness of the boundary fault between Indian and Asian plates. The intrinsically low strength of the foliated microlites crystallized from frictional melt or glass(i.e., pseudotachylyte) at seismogenic depths compared with the surrounding coarse-grained quartzofeldspathic rocks in the brittle and semi-brittle regime is sufficient to explain the localization of shear strain, the development of ductile shear zones embedded in strong wall rocks, and the transition from the strong to weak fault behaviors without invoking the presence of high fluid pressure or low friction coefficient metasomatic materials(e.g., smectite or lizardite) within the faults. 相似文献
283.
The Maximum Effective Moment (MEM) criterion predicts that the initial orientation of ductile shear zones and shear bands is ~55° relative to the maximum principal stress axis (σ1) and that the kinematic vorticity number (Wk) is ~0.94. These preferred orientations should be reflected in the pattern of quartz -fabrics in shear zones and shear bands. Common quartz -fabrics in plane strain can be divided into low-temperature (L) and high-temperature (H) fabrics, with each group showing three patterns. A steady flow with a constant value of Wk≈0.94 gives rise to L-1 and H-1 patterns, which are commonly characterized by a single axis girdle normal to the shear zone and a single -point maximum parallel to the shear zone.Once the conjugate set develops, L-1 and H-1 have opening angles of ~70° and ~110°, respectively. L-2 and H-2 are asymmetric patterns associated with variable deformation partitioning and vorticity values of 0< Wk<0.94. In contrast, L-3 and H-3 are symmetric patterns associated with 100% deformation partitioning and Wk=0. The opening angle in quartz -fabrics is implicitly linked to the temperature during deformation. The opening angle is ~70° at low temperature and ~110° at high temperature. However, a linear correction between the opening angle and the temperature cannot be established. During deformation partitioning, synthetic shear bands form earlier than antithetic bands and are more easily developed. This may result in opening angles of <70° for low-temperature fabrics and of >110° for high-temperature fabrics. The following criteria can be used to recognize reworked shear zones that have experienced multiple orogenic phases and changes in the stress state: 1) the initial Wk is larger or smaller than ~0.94; 2) the change in Wk is abrupt, rather than progressive; 3) inconsistent shear senses are inferred for the different phases of deformation; and 4) a negative value of Wk is found in reworked shear zones. 相似文献
284.
为了提高综合地球物理方法在页岩气勘探中的应用效果,基于江苏页岩气资源调查与评价工作资料,在页岩气资源早期调查评价阶段进行地球物理方法技术集成,目标是建立一套能够适应江苏以往资料积累状况和复杂构造条件下的有效勘探技术组合,以达到识别不同时期的海相、海陆过渡相、陆相页岩层位的目的。结果表明,通过勘探网络的优化、勘探手段的优选和物性参数的分析,以及先进勘探手段和处理方法的引入,对江苏下扬子区4套页岩地层分别提出了有效的技术组合,大幅降低了调查成本,进一步提高了解释精度和识别能力。 相似文献
285.
时频分析在地层旋回性分析中的应用 总被引:3,自引:0,他引:3
时频分析技术是一项十分有效和直观的地震资料特殊解释技术,它通过一定的处理方法,把时间域的数据转换为频率域时频数据,时频分析在地质勘探中具有广泛的应用,表现在地层旋回性方面,它可以实现对不同类型沉积旋回的研究、层序界面的追踪和对比以及不同规模沉积旋回的研究。 相似文献
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This paper discusses the sensitivity of softening reinforced concrete frame structures to the changes in input ground motion and investigates the possibility of localizations for this type of structure in static and dynamic analysis. A finite element model is used in which the sections resisting force are calculated using a proposed differential hysteretic model. This model is especially developed for modelling softening behaviour under cyclic loading. To obtain parameters of the differential model the moment–curvature of each section is evaluated using a microplane constitutive law for concrete and bi‐linear elasto‐plastic law for reinforcements. The capability of the procedure is verified by comparing results with available experimental data at element level, which shows good accuracy of the procedure. The effect of possible changes in ground motion is assessed using a non‐stationary Kanai–Tajimi process. This process is used to generate ground motions with approximately the same amplitude and frequency content evolution as those of base ground motion. The possibility of localization in static and dynamic loading is investigated using two structures. A measure for the possibility of localization in code‐designed structures is obtained. This study indicates that localization may occur in ordinary moment‐resisting structures located in high seismic zones. Localization may result in substantial drift in global response and instability due to P–δ effect. Also, it is shown that the structure becomes very sensitive to the input ground motion. It is concluded that allowance by some design codes of the use of ordinary moment‐resisting frames in regions with high seismicity should be revised or improvements should be made in the detailing requirements at critical sections of these structures. Copyright © 2002 John Wiley & Sons, Ltd. 相似文献