鄂豫皖交界地区地震地质背景与中强地震复发特征的研究

鄂豫皖交界地区位于东大别山西部，历史中强地震(M≥43/4)主要发生在土地岭-落儿岭及商城-麻城断裂带上，且“互动”和“连动”的特征较为显著。根据这一特征，在研究东大别山区域地质、地壳结构、断裂活动及地震构造应力场特征的基础上，可将鄂豫皖交界地区的中强地震作为秦岭-大别山活动地块中的次级地块的整体活动来看待。该区历史地震活动整体表现为丛集特征，而主要发震断层(土地岭-落儿岭断裂)的历史地震活动则具有相对较好的准周期性。地震复发周期研究提示，该地块近期发生M≥5．0左右地震的危险性较大，而霍山-六安地区为未来发生中强地震的主要危险区。     

Adjoint Sensitivity Analyses on the Anomalous Circulation Features in East Asian Summer Monsoon

ＡｄｊｏｉｎｔＳｅｎｓｉｔｉｖｉｔｙＡｎａｌｙｓｅｓｏｎｔｈｅＡｎｏｍａｌｏｕｓＣｉｒｃｕｌａｔｉｏｎＦｅａｔｕｒｅｓｉｎＥａｓｔＡｓｉａｎＳｕｍｍｅｒＭｏｎｓｏｏｎ①ＹａｎｇＹａｎ（杨燕），ＬｉＺｈｉｊｉｎ（李志锦）ａｎｄＪｉＬｉｒｅｎ（纪立人）Ｉ...     

东亚冬季风的演变特征

文章主要讨论了东亚冬季风和冷涌的演变特征，并与南亚作了对比，发现在东亚地区，冬季风演变主要表现为10月中旬经向环流的突变及9月初、11月中旬和1月末对流层低层温度的3次突变；而在南亚地区，经向环流的变化不如东亚地区明显，而且高层要先于低层变化，对流层低层温度存在2次突变。在整个冬季，东亚地区冷涌的演变过程，主要表现为南海地区冷涌在12月份出现最高频率，而西太平洋冷涌在1月份出现最高频率；南亚地区冷涌在12月份出现最高频率，但远小于东亚地区且衰减速度很快。另一个不同点是东亚地区的冷涌强度是往上衰减的，而南亚地区的冷涌强度则是往上增强的。这说明东亚冬季风和南亚冬季风的性质有较大的区别。     

Partial melting during tectonic exhumation of a granulite terrane: an example from the Larsemann Hills, East Antarctica

Anatectic migmatites in medium- to low-pressure granulite facies metasediments exposed in the Larsemann Hills, East Antarctica, contain leucosomes with abundant quartz and plagioclase and minor interstitial K-feldspar, and assemblages of garnet–cordierite–spinel–ilmenite–sillimanite. Qualitative modelling in the system K₂O–FeO–MgO–Al₂O₃–SiO₂–H₂O–TiO₂–O₂, in conjunction with various P–T calculations indicate that the high-grade retrograde evolution of the terrane was dominated by decompression from peak conditions of c. 7 kbar at c. 800 °C to 4–5 kbar at c. 750 °C. Extensive partial melting during decompression involved the replacement of biotite by the assemblage cordierite–garnet–spinel within the leucosomes. These leucosomes represent the site of partial melt generation, the cordierite–garnet–spinel–ilmenite assemblage representing the solid products and excess reactants from the melting reaction. The extraction and accumulation of this decompression-generated melt led to the formation of syntectonic pegmatites and extensive granitic plutons. Leucosome development and terrane decompression proceeded during crustal transpression, synchronous with upper crustal extension, during a progressive Early Palaeozoic collisional event. Subsequent retrograde evolution was characterized by cooling, as indicated by the growth of biotite replacing spinel and garnet, thin mantles of cordierite replacing spinel and quartz within metapelites, and garnet replacing orthopyroxene and hornblende within metabasites. P–T calculations on late mylonites indicate lower grade conditions of formation of c. 3.5 kbar at c. 650 °C, consistent with the development of late cooling textures.     

人地系统动力学研究中的几个问题

人地系统动力学研究是当前地理学研究的最主要领域，应从人的生存和发展需要出发，围绕人类活动的环境效应和人地协调发展主线选择研究对象，界定研究内容，采用物质能量守恒分析和统计分析相结合的方法，加强对人地相互作用机制的研究。     

Geothermal Regime of Meso-Cenozoic Basins and Their Tectonic Background in East China

ＧｅｏｔｈｅｒｍａｌＲｅｇｉｍｅｏｆＭｅｓｏ－ＣｅｎｏｚｏｉｃＢａｓｉｎｓａｎｄＴｈｅｉｒＴｅｃｔｏｎｉｃＢａｃｋｇｒｏｕｎｄｉｎＥａｓｔＣｈｉｎａ＊ＺｈｕａｎｇＸｉｎｇｕｏＦａｃｕｌｔｙｏｆＥａｒｔｈＲｅｓｏｕｒｃｅｓ，ＣｈｉｎａＵｎｉｖｅｒｓｉｔ...     

Reservoir Diagenesis Sequence and Framework in Intracontinent Rift Basin,East China

ＲｅｓｅｒｖｏｉｒＤｉａｇｅｎｅｓｉｓＳｅｑｕｅｎｃｅａｎｄＦｒａｍｅｗｏｒｋｉｎＩｎｔｒａｃｏｎｔｉｎｅｎｔＲｉｆｔＢａｓｉｎ，ＥａｓｔＣｈｉｎａ＊ＬｉＺｈｏｎｇＩｎｓｔｉｔｕｔｅｏｆＧｅｏｌｏｇｙ，ＣｈｉｎｅｓｅＡｃａｄｅｍｙｏｆＳｃｉｅｎｃｅｓ...     

Lithospheric Stretching,Subsidence and Thermal History Modeling: Application to Yinggehai,Qiongdongnan and Songliao Basins in East China

ＬｉｔｈｏｓｐｈｅｒｉｃＳｔｒｅｔｃｈｉｎｇ，ＳｕｂｓｉｄｅｎｃｅａｎｄＴｈｅｒｍａｌＨｉｓｔｏｒｙＭｏｄｅｌｉｎｇ：ＡｐｐｌｉｃａｔｉｏｎｔｏＹｉｎｇｇｅｈａｉ，ＱｉｏｎｇｄｏｎｇｎａｎａｎｄＳｏｎｇｌｉａｏＢａｓｉｎｓｉｎＥａｓｔＣｈｉｎａ＊Ｌｉ...     

Lower-crustal rifting in the Rukwa Graben, East Africa

An M_w 5.9 earthquake occurred in the Lake Rukwa rift, Tanzania, on 1994 August 18, and was well recorded by 20 broad-band seismic stations at distances of 160 to 800 km and 21 broad-band stations at teleseismic distances. The regional and teleseismic waveforms have been used to investigate the source characteristics of the main shock, and also to locate aftershocks that occurred within three weeks of the main shock. Teleseismic body-wave modelling yields the following source parameters for the main shock: source depth of 25 ± 2 km, a normal fault orientation, with a horizontal tension axis striking NE-SW and an almost vertical pressure axis (Nodal Plane I: strike 126°–142°, dip 63°–66°, and rake 280°–290°; Nodal Plane II: strike 273°–289°, dip 28°–31°, and rake 235°–245°), a scalar moment of 4.1 times 10¹⁷ N m, and a 2 s impulsive source time function. Four of the largest aftershocks also nucleated at depths of 25 km, as deduced from regional sPmp–Pmp times. The nodal planes are broadly consistent with the orientation of both the Lupa and Ufipa faults, which bound the Rukwa rift to the northeast and southwest, respectively. The rupture radius of the main shock, assuming a circular fault, is estimated to be 4 km with a corresponding stress drop of 6.5 MPa. Published estimates of crustal thickness beneath the Rukwa rift indicate that the foci of the main shock and aftershocks lie at least 10 km above the Moho. The presence of lower-crustal seismicity beneath the Rukwa rift suggests that the pre-rift thermal structure of the rifted crust has not been strongly modified by the rifting, at least to depths of 25 km.     

The transition from people''s property to private property: Consequences of the restitution principle for urban development and urban renewal in East Berlin''s inner-city residential areas

The constitutional decision to return to their original owners all real-estate property in East Germany that had either been expropriated or placed under state administration (the restitution principle) has had significant consequences for urban development and urban renewal. Experiences from East Berlin's innercity residential areas illustrate the effects on the state of repair of housing, the character of residential neighbourhoods, the tenants living in the areas affected, and the future structure of real-estate ownership. The case studies reveal a picture of a contradictory development of residential neighbourhoods, including shifting power relations and new polarizations, especially between tenants and landlords.