Long-term earthquake prediction along the North and East Anatolian Fault Zones based on the time- and magnitude-predictable model     

G. F. Karakaisis 《Geophysical Journal International》1994,116(1):198-204

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Incremental Stress and Earthquakes     

Y.Y. Kagan 《Geophysical Journal International》1994,117(2):345-364

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太白山古冰川地貌与地质构造     

夏正楷 《冰川冻土》1990,(4)

太白山分布有更新世冰川地形,其冰川槽谷在平面上呈“十”字型排列;横剖面EW向的呈宽谷形,NS向是呈U型:纵剖面EW向比较平坦,SN向呈阶梯状,其中有许多断裂陡坎。冰斗均位于断裂交汇点,面积不大而深度却相当大。这些地形的形态特征可以用构造加以解释,断裂破碎带是最有利于冰川刨蚀的地段。  相似文献   

SEDIMENT TRANSPORT OF LOW CONCENTRATION IN PIPES     

R.H. MAT SUKI  R.BAKER ①Lecturer  Dept. of Civ.  Struct. Engrg.  Univ.Kebangsaan M''''sia  Bangi  Malaysia ②Lecturer  Dept. of Civ. Engrg.  University of Salford. MWT England. 《国际泥沙研究》1991,(2)

The study of Sediment transport of low concentration in pipes bas been applied in the design of a self-cleansing storm sewer. An alternative criterion is suggested as op- posed to the widely used single flow velocity approach. A conceptual model which simu- lates the condition in a storm sewer is developed and tested against experimental data. The results proved that the volumetric sediment concentration, pipe diameter and sedi- ment size have to be taken into consideration to produce a self-cleansing storm sewer. It also shows that the slope obtained by this alternative criterion is lower than the single flow velocity approach.  相似文献   

高精度锥体棱镜的“自差法”检测技术   总被引：2，自引：0，他引：2  

殷达安  林银森 《测绘学报》1994,23(3):216-221

本文提出一种采用“自差法”检测高精度锥体棱镜的新方法，阐述检测原理与装置，建立检测角度和面形误差的定量判据，并给出一个实例说明其应用。实践表明，“自差法”检测技术对于产品质量的控制，具有快速准确和简便实用等特点。  相似文献   

水压致裂煤层裂缝发育特点的研究   总被引：5，自引：0，他引：5       下载免费PDF全文

李同林 《地球科学》1994,19(4):537-545

本文对煤岩基本力学性质、煤层水压致裂缝形成条件、裂缝形态以及裂缝开裂角方位等基本理论进行了研究与探讨，通过大量煤岩力学性质测试，证实了试验区目的层煤岩弹性模量低，泊松比较高，脆性大，易破碎，易压缩。文章还得出了目的层煤岩Ｍｏｈｒ断裂准则二次抛物线型包络线，煤层水压致裂裂缝形式判断，裂缝开裂角方位的计算公式以及有关结论。  相似文献   

北京及邻区现代微震重新定位及其构造含义   总被引：5，自引：0，他引：5  

汪素云  许忠淮  俞言祥  环文林 《中国地震》1995,11(3):222-230

本文采用Ｐｏｗｅｌｌ直接搜索定位方法对北京西北地区（３９°－４１°Ｎ，１１４°－１１７°Ｅ）１９７９—１９９２年３月发生的３４８个地震重新定位。通过震相到时的复核和补充、定位速度结构模型的修定以及定位程序的改进等措施，改善了定位效果。结果表明，重新定位后给出震源深度的地震数从原来的１３２个增至３１３个；定位结果均方根残差的均值从０．８０±０．４０ｓ降至０．４５±０．１８ｓ；各台Ｐ波到时残差下降；有近１０％的地震震中位置移动了１０ｋｍ以上，它们多位于北京地震遥测台网边缘地区。重新定位后的地震震中集中分布于怀安、宣化、怀来、琢鹿等山间盆地内部并与盆地边缘断裂有关。此外，地震还分布于山区和平原的交界地带。  相似文献   

A conjugate strike-slip fault system within the extensional tectonics of Western Turkey     

Mustafa Aktar  Hayrullah Karabulut  Serdar Özalaybey  Dean Childs 《Geophysical Journal International》2007,171(3):1363-1375

Three main shocks M-1, M-2 and M-3 (17 October 2005 at 05:45 UTC, M _w 5.4; 17 October at 09:46 UTC, M _w 5.8 and 20 October at 21:40 UTC, M _w 5.9) and their associated aftershocks within the Gulf of S i ğac i k, 50 km southwest of Izmir, Turkey were studied in detail. A temporary seismic network deployed during the activity allowed the hypocentre of M-3 and subsequent aftershocks to be determined with high accuracy. A relative relocation technique was used to improve the epicentres of M-1 and M-2. All three main shocks have strike-slip mechanisms which agree with the linear trends of the aftershock locations. Two distinct zones were illuminated by the aftershock locations. The zones contain clear echelon patterns with slightly different orientations from the trend of the aftershock distribution. M-2 and M-3 ruptured along of the eastern rupture zone which aligns N45°E. However the strike direction of M-1 is not clearly identified. The alignment of the two rupture zones intersect at their southern terminus at an angle of 90°. The fault zones form conjugate pair system and static triggering is considered as a probable mechanism for the sequential west to east occurrence of M-1, M-2 and M-3. This earthquake sequence provides seismological evidence for conjugate strike-slip faulting co-existing within a region dominated by north–south extension and well-developed east–west trending normal faults.  相似文献   

拉斯曼丘陵新生代剥露作用的裂变径迹证据     

陈宣华  马宗晋  蒋荣宝  万景林  徐刚  姜梅  陈丹红 《地学前缘》2007,14(4):175-188

在西南极和横贯南极山脉地区,新生代裂谷和剥露作用非常普遍。但是,文献中很少记录东南极地区的新生代剥露作用。文中根据东南极普里兹湾拉斯曼丘陵地质样品的磷灰石裂变径迹年龄和热历史的模拟,认为在东南极海岸边缘存在新生代的隆升和伸展作用,其年龄为始于(49.8±12)Ma。该年龄略晚于西南极裂谷系的启动年龄(约60~50Ma)。由于差异隆升作用,在拉斯曼丘陵地区发育了更新的正断层作用——拉斯曼丘陵拆离断层的新活动,其年龄为约5.4Ma。东南极周缘新生代裂谷和伸展作用的普遍存在,是冈瓦纳裂解以来大陆分离和印度洋形成的结果。  相似文献   

Strike slip faulting inferred from offsetting of drainages: Lower Narmada basin, western India     

Rachna Raj 《Journal of Earth System Science》2007,116(5):413-421

The detailed analysis of landforms, drainages and geology of the area between the rivers Amaravati and Karjan was carried out in order to understand the tectonic history of the lower Narmada basin. Movement along the various faults in the area was studied on the basis of the drainage offsetting. Horizontal offsetting of stream channels was found quite demonstrable along NNW-SSE trending transverse faults. Tectonic landforms including systematic deflection of stream channels and ridges, alignment of fault scarp and saddles and displacement in the basement rocks and alluvial deposits show that the area is undergoing active deformation driven by the NSF system.  相似文献