Precursory seismic crustal deformation in the area of southern Albanides     

B.C. Papazachos  A.S. Savvaidis  C.B. Papazachos  G.F. Karakaisis 《Journal of Seismology》2002,6(2):237-245

On the basis of growing evidence thatstrong earthquakes are preceded by a periodof accelerating seismicity of moderatemagnitude earthquakes, an attempt is madeto search for such seismicity pattern in NWAegean area. Accelerating seismic crustaldeformation has been identified in the areaof southern Albanides mountain range(border region between Greece, formerYugoslavia and Albania). Based on certainproperties of this activity and on itssimilarity with accelerating seismicdeformation observed before a strongearthquake which occurred in the sameregion on 26 May 1960 (M = 6.5), we canconclude that a similar earthquake may begenerated in the same region during thenext few years. This conclusion is inagreement with independent results whichhave been derived on the basis of the timepredictable model.  相似文献   

青藏高原土壤水热分布特征及冻融过程在季节转换中的作用   总被引：21，自引：0，他引：21  

杨梅学  姚檀栋  何元庆 《山地学报》2002,20(5):553-558

利用GAME-Tibet期间所取得的高分辩率土壤温度和含水量资料，对青藏高原（主要是藏北高原）土壤水热分布特征及冻融过程在季节转换中的作用进行了分析。指出藏北高原4cm学深处土壤在10月份开始冻结，次年4-5月份开始消融，冻结持续时间长达5-7个月。冻结过程有利于土壤维持其水分，因此，在刚刚开始消融时土壤含水量仍然很高。从而为夏季风爆发前土壤通过蒸发向大气提供水分打下了基础。指出土壤冻融过程可能在高原季节转换中起着重要作用。  相似文献   

Thermal budget of the Transylvanian lithosphere. Reasons for a low surface heat-flux anomaly in a Neogene intra-Carpathian basin     

Maria Andreescu  Søren B. Nielsen  Gabriela Polonic  Cri&#;an Demetrescu 《Geophysical Journal International》2002,150(2):494-505

  相似文献   

Is there any detachment in the Lower Dolpo (western Nepal)?Y a-t-il un détachement dans le bas Dolpo (Népal occidental) ?     

Rodolfo Carosi  Chiara Montomoli  Dario Visonà 《Comptes Rendus Geoscience》2002,334(12):933-940

A structural transect in the Lower Dolpo highlights that the deformation and metamorphism of the Tibetan Zone (TZ) increase toward the bottom of the sequence. The contact with the underlying HHC is marked by a metamorphic jump from amphibolite facies in the carbonatic rocks of the upper part of the HHC to greenschist facies marbles in the TZ. Moreover, the HHC and the TZ show different metamorphic histories. The contact zone shows a strain increase accompanied by asymmetric folds with a top-to-the-northeast vergence, connected to a down-to-the-northeast tectonic transport. The contact is interpreted as an extensional shear zone, connected to the South Tibetan Detachment System. To cite this article: R. Carosi et al., C. R. Geoscience 334 (2002) 933–940.  相似文献   

Locating and quantifying the seismic discontinuities in a complex medium through the migration and AVA analysis of reflected and converted waves: an application to the Mt Vesuvius volcano     

E. Auger  J. Virieux  A. Zollo 《Geophysical Journal International》2003,152(2):486-496

  相似文献   

Evolution of orogenic wedges and continental plateaux: insights from crustal thermal–mechanical models overlying subducting mantle lithosphere     

O. Vanderhaeghe  S. Medvedev  P. Fullsack  C. Beaumont  R. A. Jamieson 《Geophysical Journal International》2003,153(1):27-51

  相似文献   

Gorringe Ridge gravity and magnetic anomalies are compatible with thrusting at a crustal scale     

J. Galindo-Zaldívar  A. Maldonado  A. A. Schreider 《Geophysical Journal International》2003,153(3):586-594

  相似文献   

Separation of intrinsic absorption and scattering attenuation from Lg coda decay in central France using acoustic radiative transfer theory   总被引：3，自引：0，他引：3  

Céline Lacombe  Michel Campillo  Anne Paul  Ludovic Margerin 《Geophysical Journal International》2003,154(2):417-425

  相似文献   

Receiver function study of the Hellenic subduction zone: imaging crustal thickness variations and the oceanic Moho of the descending African lithosphere   总被引：3，自引：0，他引：3  

X. Li  G. Bock  A. Vafidis  R. Kind  H.-P. Harjes  W. Hanka  K. Wylegalla  M. van der Meijde  X. Yuan 《Geophysical Journal International》2003,155(2):733-748

  相似文献   

长江中下游晚中生代中基性岩的铅同位素特征:富集地幔的证据   总被引：33，自引：3，他引：33  

闫峻  陈江峰  喻钢  钱卉  周泰禧 《高校地质学报》2003,9(2):195-206

长江中下游东段庐枞、怀宁、繁昌、铜陵和宁芜地区的中基性岩属于碱性系列 ,具有高的U ,Th含量和Th/Pb ,U/Pb比值 ,分别平均为 2 .82× 10 -6,9.5 6× 10 -6和 0 .6 35 ,0 .184。样品的初始铅同位素 (130Ma)组成为 :(2 0 6Pb/ 2 0 4Pb) i=17.6 5～ 18.6 0 ,(2 0 7Pb/ 2 0 4Pb) i=15 .4 2～ 15 .5 0 ,(2 0 8Pb/ 2 0 4Pb) i=37.6 7～ 38.0 4。形成中基性岩的原始岩浆来源于富集的岩石圈地幔 ,具有EMⅠ和EMⅡ ,且以EMⅡ为主的特征。和长江中下游西段黄石地区以及大别地块西南部玄武岩的比较表明 ,长江中下游地区岩石圈地幔高的Th/Pb和U/Pb比值可能和俯冲板片析出流体的交代有关。晚中生代时期 ,华北板块岩石圈地幔以EMⅠ特征为主 ,华南板块岩石圈地幔以EMⅡ特征为主 ,岩石圈地幔性质的区域性分布与印支期扬子板块深俯冲事件密切相关。虽然中国东部新生代玄武岩因岩石圈大规模减薄表现了亏损特征 ,但残留的富集岩石圈地幔在中国东部新生代玄武岩的Pb同位素中仍有所反映  相似文献