则木河断裂的现今活动方式及其地形变鉴别标志探讨

根据地壳形变测量资料，探讨了则木河断裂的现今活动方式及其定性的地形变鉴别标志问题。结果表明：则木河断裂的现今活动具有明显的分段性特征，即以大箐为界分为南北两段，北段以粘滑活动为主，南段以蠕滑活动为主；沿则木河断裂带垂直位移速率空间分布特征的显著差异，可以作为鉴别断裂现今活动方式的标志之一，其位移速率的相对大小，可作为鉴别断裂现今活动方式的一种参考标志     

1987年1月8日甘肃迭部5.9级地震与地形变特征

根据１９８７年１月８日甘肃迭部５．９级地震前，该区域的地壳形变中长期背景和定点台站连续观测资料的震反应异常，分析研究了这此异常的变化特征。     

Early deformation fabrics of melange in the Mesozoic Waipapa Terrane, North Island, New Zealand

Abstract The Waipapa Terrane in northern North Island, New Zealand, is a Mesozoic accretion-ary complex formed along the Gondwana margin. It contains abundant melange rocks with distinctive characteristics. Precise analyses of their mesoscopic fabrics in Waiheke Island near Auckland have revealed the following sequence of deformation. The earliest phase of deformation of the sandstone/mudstone association, which is the main constituent of this terrane, originated by chaotic mixing of sand and mud due to liquidization of water-saturated, poorly consolidated sediments. The second phase was characterized by hydrofracturing and subsequent forceful injection of ductile mud into rather brittle sand. Local intrusions of sand forming dykes and sills followed these events, as well as intrusions of pelagic/hemipelagic green argillite originally underlying the sandstone/mudstone association. An abundant occurrence of these mixing and multi-stage injection/intrusion fabrics strongly suggest that the Waipapa Terrane around the study area was a site of high pore-fluid pressure. Scaly-foliated melange fabrics with monoclinic symmetry, originating from layer-parallel shearing, were then locally superimposed on the pre-existing melange fabrics. Similar scaly-foliated fabrics also developed in the chert beds originally intercalated between the green argillite and the uppermost part of the oceanic crust. These scaly fabrics might have been related to the regional stacking and juxtaposition of the accreted sediments. The sequence and variation in style of deformation forming the melange fabrics presumably reflected changes in porosity and state of compaction of accreted sediments in a shallow tectonic level.     

Geomorphological study on a clastic accretionary prism: The Nankai Trough

Abstract The Nankai Trough, off southwest Japan, is one of the best sites for the study of geomorphic characteristics of a clastic accretionary prism. A recent multibeam survey over the central and eastern parts of the Nankai accretionary prism has revealed a large variation of the topography along the trough axis. Analysis of the bathymetric data suggests the existence of prism deformational features of different scales, such as depressions, embayment structures and cusps. These structures are the results of slope instability caused by basement relief of subducted oceanic plate. Unstable slopes recover by new accretion and development of a low angle thrust. Small-scale deformation due to the subduction of a small isolated seamount is then adjusted to the regional trend. By contrast, a 30 km indentation of the wedge observed in the eastern part of the Nankai Trough, the Tenryu Cusp, has seemed to retain its geometry. The subducted Philippine Sea plate has deformed greatly near the eastern end of the Nankai Trough, because of the collision between the Izu-Ogasawara (Bonin) arc and central Japan. Therefore, the indentation may be the result of the continuous subduction of a basement high, such as the Zenisu Ridge, which has been formed under north-south compression due to the arc-arc collision.     

节理岩体断裂的分形机理研究

本文在考察了节理化岩体的断裂力学特征的基础上，结合现代分形几何原理，建立起追踪裂纹裂分形模型，对不连续岩体的断裂韧性的分形效应进行了深入研究，并通过压剪试验得到难。     

内蒙古东五分子地区韧性剪切变质作用的特征

东五分子地区花岗-绿岩地体经受了三种类型变质作用的改造。韧性剪切带不仅控制了区域变质岩组合的分布,而且也导致其变质作用的强度出现了逆转序列。根据岩石的结构、碎斑含量及矿物成分,韧性剪切变质岩划分为三类,其共同特点是具有碎斑结构。其变形结构分为单矿物型及组合型。同一块韧性剪切变质岩由处在单变平衡的一组矿物组成。根据岩石变形及重结晶的特点,结合其产状,确定出两种不同类型韧性剪切变质带。共生矿物对的研究证明它们形成于地壳不同深度及温度、压力条件。本区的金矿化、运移、沉淀与韧性剪切变质带紧密相关。     

北京西山水平分层剪切流变构造初探

对比国内外关于变质岩区构造变形序列的实例,可知第一世代的构造变形几乎都以发育不同尺度的强烈扁平化平卧褶皱和有关的轴面流劈理或片理,以及近水平的韧性剪切带等构造组合为特征。北京西山的情况也不例外。这可能代表变质岩区早期构造变形的一种普遍模式,可能是地壳较深构造层次发生大规模透入性水平剪切流变的反映     

Deformation and metamorphism in the Bard area of the Sesia Lanzo Zone, Western Alps, during subduction and uplift

The structure, microstructure and petrology of a small area close to the village of Bard in Val d'Aosta (Italy) has been studied in detail. The area lies across the contact between the Gneiss Minuti (GM) and the Eclogitic Micaschist (EMS) Complexes of the Lower element of the Sesia portion of the Sesia-Lanzo Zone (Western Alps). Both complexes have undergone high-pressure metamorphism, but the metamorphic assemblages indicate a sudden increase in pressure in going across the contact from the GM to the EMS. Therefore, we interpret the contact as a thrust dividing the lower element of the Sesia into two sub-elements. This interpretation is supported by structural evidence.
The early Alpine (90-70 Ma) metamorphic history is best preserved in the EMS and is one of increasing pressure associated with thrusting. The maximum P/T recorded in the EMS is >1500 MPa (>15kbar) and 550°C and in the GM is < 1500-1300 MPa (< 15-13 kbar) and 500-550°C. We suggest that the rocks were probably in an active Benioff zone during this time.
From then on the histories of the GM and EMS are the same. Deformation continued and the thrust and thrust slices were folded during decreasing pressure. We interpret the first postthrusting deformation in terms of uplift associated with continued shortening of the crust and underplating after the Benioff zone had become inactive and a new Benioff zone had developed further to the north-west.
A still later deformation and the Lepontine metamorphism (38 Ma) are related to continued uplift. Much of this deformation is characterized by structures indicative of vertical shortening and lateral spreading as the mountains rose above the general level of the surface.     

双节点有限元模拟直立走滑断裂地震位移场

结合位错理论和有限单元法，对介质横向不均匀性引起的直立走滑断裂地震水平位移场不对称性进行了数值模拟研究。结果表明，断层两侧介质泊松比和弹性模量的横向不均匀性，均可以引起直立走滑断层同震破裂及地震位移场的不对称性，其中，断层两侧介质的剪切模量比(刚度比)对直立走滑断裂地震位移场不对称性起主要作用。     

云南地区断层形变群体异常与成组强震

运用前兆综合信息量S、前兆群体非均匀度ID以及近源异常凸现值NS的数学分析这三种方法，对云南地区1982～2004年跨断层短基线短水准资料进行了分析处理．结果表明，在云南地区Ms≥6强震前断层彤变群体异常显著，尤其是成组强震前，群体异常信息较为丰富。