A Preliminary Study of Palaeoearthquakes on the Maqu Fault of East Kunlun Fault Zone

INTRODUCTIONThe east Kunlun active fault is an important NWWtrending boundary fault on the northeasternmargin of the Qinghai-Xizang(Tibet)Plateau.The fault extends fromthe northside of the Qiangtangmassif in the west,runs eastward through the Kusai Lake,Dongdatan,Xidatan,Tuosuo Lake andMaqu to the north of Zoig毢(Van Der Woerd,et al.,2002;Ma Yinsheng,et al.,2005;Seismological Bureau of Qinghai Province,et al.,1999;Li Chunfeng,et al.2004).The intenseleft-lateral strike-slip move…     

内蒙古东乌旗哈巴特盖银多金属矿土壤地球化学异常特征

哈巴特盖测区1／5万土壤地球化学测量发现了4个异常区，多元素组合异常多分布在黑云母二长花岗岩的内、外接触带上，土壤地球化学异常特征显示本区成矿是多期次的，多元素组合异常在露头矿和盲矿上方均有出现，且异常连续、浓集中心明显，异常的强度和规模大，呈带状、宽带状或面状产出。     

长江口岸带冲淤及后备土地资源的沉降效应——以上海崇明东滩为例

长江口入海泥沙的淤积是上海后备土地资源的重要来源，分析岸带冲淤的演变．有助于对岸带经济圈特别是围垦促淤地区因经济工程活动引发的地面沉降问题的剖析。本文以上海崇明东滩为例，分析30年来的冲淤变化及未来趋势，并据此对新近沉积土的地面沉降效应作简要阐述。     

济南东部埠村超单元及其就位机制

分布于济南东部六山圈—大有一带的侵入岩,为燕山早期同一岩浆热事件多次侵入形成的杂岩体,依其形成顺序可划分为山张庄、西杜、大有、赵家鹊山四个单元,归并为埠村超单元。该超单元的形成与幔源基性岩浆上侵及同源岩浆分异产生的中偏基性—中性岩浆多次侵入有关,属热气球式膨胀与火山口塌陷复合就位机制。     

对山东高压-超高压变质带的几点看法——程裕淇院士野外考察记

通过对山东高压超高压变质带的考察,初步认为：榴辉岩的最后隆升时代为燕山期;含硬玉石英岩＋榴辉岩＋（透辉石）大理岩组合说明表壳岩经历了高压超高压变质作用;该带晋宁期长英质片麻岩花岗岩广泛出露;在其北部麻粒岩和榴辉岩密切伴生。     

准四年周期的北半球夏季遥相关与东亚夏季风环流的相互关系

利用ＮＭＣ的２００ｈＰａ和８５０ｈＰａ风场资料研究了北半球夏季遥相关和东亚夏季风异常环流在准４年时间尺度上的相互关系。研究发现当北半球夏季出现积雪强迫型遥相关时,东亚－西太平洋地区既存在异常纬向环流,也存在异常经向环流;而当出现东亚太平洋型遥相关时,东亚－西太平洋地区以异常纬向环流为主。分析还发现源于北太平洋的异常涡旋在向南传播的过程中,先取西南路径,在到达菲律宾东部以后折向东南。     

Application of connectivity theory to model the impact of terrace failure on runoff in semi‐arid catchments

Terraces are a common feature of Mediterranean landscapes. In many places they are no longer maintained so that the number of intact terraces is in prolonged decline. The aim of this paper is to examine the effect of terrace removal and failure on hydrological connectivity and peak discharge in an agricultural catchment (475 ha) in south‐east Spain. The situation of 2006 is compared to that in 1956 and to a scenario without terraces (S2). The spatial distribution of concentrated flow was mapped after four storms in 2006. The degree of connectivity was quantified by means of connectivity functions and related to storm characteristics, land use and topography. For 1956, 2006 and scenario S2, connectivity functions and peak discharge to the river were determined for a storm with a return period of 8·2 years. The results show that the decrease in intact terraces has led to a strong increase in connectivity and discharge. The contributing area to the river system has increased by a factor 3·2 between 1956 and 2006. If all terraces were to be removed (scenario S2), the contributing area may further increase by a factor 6·0 compared to 2006. The spatial extent of concentrated flow and the degree of connectivity are related to storm magnitude as expressed by the erosivity index (EI₃₀). Although a large part of the concentrated flow (25–50%) occurs on dirt roads, it appears that croplands become a major source of runoff with increasing rainfall. The results suggest that connectivity theory can be used to improve rainfall–runoff models in semi‐arid areas. Copyright © 2009 John Wiley & Sons, Ltd.     

Simulation of wind-induced near-inertial oscillations in a mixed layer near the east coast of Korea in the East/Japan Sea

Using a simple damped slab model,it was possible to show that a local wind induced 88%(15 of 17)of the near-inertial oscillations(NIO)observed in the mixed layer near the east coast of Korea from 1999 to 2004.The model,however,overestimated the energy level in about two-thirds of the simulated cases,because the slab model was forced with winds whose characteristic period was shorter than the damping time scale of the model at 1.5 d.At the observation site,due to typhoons and orographic effects,high-frequency wind forcing is quite common,as is the overestimation of the energy level in the slab model results.In short,a simple slab model with a damping time-scale of about 1.5 d would be enough to show that the local wind was the main energy source of the near-inertial energy in this area,but the model could not be used to accurately estimate the amount of the work done by the wind to the mixed layer.     

Minimum Bedrock Exposure Ages and Their Implications: Larsemann Hills and Neighboring Bolingen Islands, East Antarctica

<正>Considerable controversy exists over whether or not extensive glaciation occurred during the global Last Glacial Maximum(LGM) in the Larsemann Hills.In this study we use the in situ produced cosmogenic nuclide ~(10)Be(half life 1.51 Ma) to provide minimum exposure ages for six bedrock samples and one erratic boulder in order to determine the last period of deglaciation in the Larsemann Hills and on the neighboring Bolingen Islands.Three bedrock samples taken from Friendship Mountain(the highest peak on the Mirror Peninsula,Larsemann Hills;～2 km from the ice sheet) have minimum exposure ages ranging from 40.0 to 44.7 ka.The erratic boulder from Peak 106(just at the edge of the ice sheet) has a younger minimum exposure age of only 8.8 ka.The minimum exposure ages for two bedrock samples from Blundell Peak(the highest peak on Stornes Peninsula,Larsemann Hills;～2 km from the ice sheet) are about 17 and 18 ka.On the Bolingen Islands(southwest to the Larsemann Hills;～10 km from the ice sheet),the minimum exposure age for one bedrock sample is similar to that at Friendship Mountain(i.e.,44 ka).Our results indicate that the bedrock exposure in the Larsemann Hills and on the neighboring Bolingen Islands commenced obviously before the global LGM(i.e.,20-22 ka),and the bedrock erosion rates at the Antarctic coast areas may be obviously higher than in the interior land.     

1961—2005年河西走廊东部极端气温事件变化

利用1961—2005年河西走廊东部五站的逐日气温资料,通过百分位法定义了不同台站的逐日极端高、低温阈值,研究了河西走廊东部近45a来极端气温事件变化的空间分布以及时间变化特征.结果表明:在空间分布上,河西走廊东部极端最高气温总阈值民勤出现了暖中心,乌鞘岭出现了冷中心;极端最低气温总阈值暖中心出现在武威,冷中心出现在乌鞘岭;极端最高、低气温空间分布与其对应阈值的空间分布类似;河西走廊东部极端低温频数南北部都呈现减少趋势,而极端高温频数在南部古浪和北部靠近沙漠区的民勤呈现减少趋势,其它地区为增加趋势.时间变化上,河西走廊东部极端最高、低气温总体都呈增温趋势,增温幅度极端最低气温比极端最高气温明显;极端最高气温频数总体呈略增加趋势,极端最低气温频数呈明显的减少趋势;极端最高、低气温和极端最高、低气温频数都是6～7a和9～10a周期反映明显;极端最高、低气温增温以及极端高温频数增加和极端低温频数减少都发生了突变现象.