重力球面外部校正技术

山区重力勘探中，重力外部校正是重力勘探料处理和解释的前提，其内容包括地形校正、中间层校正等。本文在分析常规外部校正方法的基础上，提出了一套适合于山区重力勘探的球面地形校正及有限球壳中间层校正方法，并严格推出了球面地形校正公式。对中国南方ZJJ地区重力资料处理结果表明，该方法提高了地形校正的精度，使山区重力资料品质达到或接近平原区的水平。     

Incorporating low‐cycle fatigue model into duration‐dependent inelastic design spectra

Seismic performance of structures is related to the damage inflicted on the structure by the earthquake, which means that formulation of performance‐based design is inherently coupled with damage assessment of the structure. Although the potential for cumulative damage during a long‐duration earthquake is generally recognized, most design codes do not explicitly take into account the damage potential of such events. In this paper, the classical low‐cycle fatigue model commonly used for seismic damage assessment is cast in a framework suitable for incorporating cumulative damage into seismic design. The model, in conjunction with a seismic input energy spectrum, may be used to establish an energy‐based seismic design. In order to ensure satisfactory performance in a structure, the cyclic plastic strain energy capacity of the structure is designed to be larger than or equal to the portion of seismic input energy contributing to cumulative damage. The resulting design spectrum, which depends on the duration of the ground motion, indicates that the lateral strength of the structure must be increased in order to compensate for the increased damage due to an increased number of inelastic cycles that occur in a long‐duration ground motion. Examples of duration‐dependent inelastic design spectra are developed using parameters currently available for the low‐cycle fatigue model. The resulting spectra are also compared with spectra developed using a different cumulative damage model. Copyright © 2004 John Wiley & Sons, Ltd.     

"5.10"强对流天气雷达产品特征及临近预报

本文运用多普勒雷达的基本反射率(R)、基本径向速度(V)、垂直积分液态含水量(VIL)等产品对2005年5月10日邯郸发生的强对流天气进行分析,总结了雷达产品特征,得出了一些具有实用价值的结果,为预报员快速判断强对流的潜势提供参考.     

“5．10”强对流天气雷达产品特征及临近预报

本文运用多普勒雷达的基本反射率（R）、基本径向速度（V）、垂直积分液态含水量（VIL）等产品对2005年5月10日邯郸发生的强对流天气进行分析，总结了雷达产品特征，得出了一些具有实用价值的结果，为预报员快速判断强对流的潜势提供参考。     

Geoarchaeological evidence for multidecadal natural climatic variability and ancient Peruvian fisheries

Understanding the influence of natural climatic variability on modern fisheries is complicated by over a century of industrial fishing. Archaeological data provide unique opportunities for assessing precolonial and preindustrial fisheries. Records show that anchoveta-vs sardine-dominated fisheries correlate with 20th-century climate change in the Pacific Basin and are linked to multidecadal climatic variability. The “anchovy regime” is characterized by cooler conditions and lower frequency El Niño/Southern Oscillation (ENSO) events, while the “sardine regime” is associated with warmer conditions and higher frequency ENSO. Fish remains excavated at Lo Demás, an Inca-period (ca. A.D. 1480–1540) fishing site at 13°25′S on the Peruvian coast, document a shift from an anchoveta-to a sardine-dominated fishery at about A.D. 1500. This shift correlates with records for increasing ENSO frequency at the same time. Middle and late Holocene sites have archaeofish assemblages that also suggest regime changes. Here we show that changes in fish regimes can result from natural variability and we support the potential role of archaeological assemblages in tracking multidecadal climate change in the Pacific Basin throughout the Holocene (0–11,500 cal yr B.P.).     

Late Cenozoic Stratigraphic Sequence and Its Implication to Tectonic Evolution, Hejiakouzi Area, Ningxia Hui Autonomous Region

ＩＮＴＲＯＤＵＣＴＩＯＮＨａｉｙｕａｎ Ｔｏｎｇｘｉｎｓｙｎｔａｘｉｓ ,ｗｈｉｃｈｌｉｅｓｏｎｔｈｅｎｏｒｔｈｅａｓｔｅｒｎｅｄｇｅｏｆｔｈｅＱｉｎｇｈａｉ ＸｉｚａｎｇＰｌａｔｅａｕ ,ｗａｓｆｏｒｍｅｄａｎｄｓｅｖｅｒｅｌｙｄｅｆｏｒｍｅｄａｓｆｏｒｅｌａｎｄｂａｓｉｎｄｕｅｔｏｔｈｅｒｉｓｅｏｆｔｈｅＱｉｎｇｈａｉ ＸｉｚａｎｇＰｌａｔｅａｕｓｉｎｃｅｔｈｅＣｅｎｏｚｏｉｃ .Ｉｎｔｈｅａｒｃ ｌｉｋｅｒｅｇｉｏｎ ,Ｃｅｎｏｚｏｉｃｄｅｐｏｓｉｔｓａｒｅｗｉｄｅｌｙｄｉｓｔｒｉｂｕｔｅｄａｎｄｐｅ…     

灵武断裂晚第四纪古地震及其破裂特征

在地质地貌调查基础上 ,对灵武断裂进行了古地震槽探揭露。结果显示 ,距今 2 8ka以来 ,灵武断裂上发生过 5期地表破裂型地震事件 ,时间大约分别在距今 ( 2 7 15± 0 778) ,2 0 0 ,( 13 0 7± 0 0 6) ,( 10 586± 0 0 5)和 6 0ka。根据 5期古地震事件的综合对比分析 ,发现断裂有分段组合破裂的特征 ,由此并结合槽探揭示的古地震同震位移等估计了古地震的震级     

白垩-第三纪界线样品异常铱的赋存状态及其地质意义

 通过对地质样品中铱的赋存状态研究及对残渣相中微粒的透射电镜分析,得出:在K-T界线样品中铱主要存在于残渣相中,不利于地球化学过程富集铱;铱在残渣相的富集与有机不溶物的存在没有必然联系;白垩-第三纪的生物绝灭事件中有火山活动参与;K-T界线事件的触发物为地外物质撞击。最后提出了K-T界线样品异常铱来源于地外物质撞击和火山喷发的混合模型。     

吉林东部花岗岩风化的地球化学

描述了吉林东部花岗岩风化壳的特征。研究了花岗岩风化过程中主要造岩矿物的变化特点;建立了主要造岩矿物的风化序列。研究了主量元素、微量元素及稀土元素的地球化学行为;探讨了影响风化过程中元素行为的主要因素。计算了风化速率。     

澜沧—耿马地震的地表破裂特征

本文通过对澜沦—耿马地震所形成的地震形变带中地震断层和构造地裂缝的追索、调查和实测,分析了澜沧—耿马地震地面破坏的组合类型及其与构造线的展有关系,对形成澜沧—耿马地震的应力场及控震、发震构造进行了初步研究。