Paleoearthquake rupture behavior and recurrence of great earthquakes along the Haiyuan fault,northwestern China   总被引：16，自引：0，他引：16  

ZHANG Peizhen  MIN Wei  DENG Qidong & MAO Fengying State Key Laboratory of Earthquake Dynamics  Institute of Geology  China Seismological Bureau  Beijing  China 《中国科学D辑(英文版)》2005,48(3):364-375

Paleoseismological studies have shown that indi-vidual past large-magnitude earthquakes can be recog-nized in the geological record and the timing betweenevents can be measured through Quaternary datingtechniques[1—6]. Thus, through paleoseismological st-udies, it is possible to determine age of each prehis-toric event so that recurrence intervals of large earth-quakes may be evaluated which provides a means toexpand the limited view of earthquakes offered by thehistorical and instrumental re…  相似文献   

西准噶尔达拉布特断裂系构造演化特征     

冯鸿儒  李旭  刘继庆 《地球科学与环境学报》1990,(2)

呈北东走向横贯于西准噶尔的达拉布特断裂系,是一组倾向北西的犁状断层。断裂系的形成、发育是由于碰撞后的西伯利亚、哈萨克斯坦和塔里木三大陆块在早石炭世以后,仍在不断地相向运动。由此所形成的断裂系,其早期是以左行陡倾的走滑断层形式出现;中期受陆内俯冲作用的影响,被强烈的推覆构造改造成上陡下缓的犁状断层;娩近时期,断裂处于引张状态,表现为正断层性质,形成了明显的断层地貌。  相似文献   

闪锌矿精矿的氧压酸浸提取研究     

杨仲平  靳晓珠  黄俭惠 《矿产与地质》2005,19(4):449-451

对锌精矿的氧压酸浸条件进行了研究,实验表明：在压力为1.7MPa、温度为140℃～155℃条件下加热1小时,浸出终液硫酸酸度＞1.0mol/L时,锌精矿中锌及稀散元素的浸出率分别为：98.76%（Zn）、96.42%（Ga）、89.03%（Ge）、97.35%（In）、91.30%（T1）.结果表明,该方法具有较高的浸出率,并能消除对环境的污染,具有一定的应用前景.  相似文献   

Qualitative and Quantitative Characteristics of Modeled and Natural Oscillatory Zoning Patterns in Calcite     

N. A. Bryksina  N. M. Halden  S. Mejia 《Mathematical Geology》2006,38(5):635-655

Four types of oscillatory zoning patterns (OZP) produced by a dynamic model are described qualitatively and quantitatively and displayed as simulated cathodoluminescence images. The behavior of the dynamic model was investigated in terms of the parameter θ, which is the ratio of diffusivities of Ca²⁺ and H₂CO₃, and in terms of the parameter γ, which is the product of θ and the ratio of concentrations of Ca²⁺ and H₂CO₃ far away from the crystal surface. Qualitatively, the dynamics of the model has been characterized by a stable focus, an unstable focus changing to a stable node or to a stable limit cycle, and by periodical behavior with constant amplitude. Quantitative characteristics, including amplitude of oscillations and duration of oscillations, change between the patterns. It is shown that the process of forming oscillatory zoning in calcite with conditions corresponding to periodical behavior with constant amplitude is very slow in comparison to other OZPs. The oscillatory zoning pattern in a natural calcite crystal is described qualitatively in terms of four general OZPs produced by the dynamic model.  相似文献   

Elman神经网络在地下水动态预测中的应用     

陈伟韦  卢文喜  柳大伟  赵军海  王红霞 《吉林大学学报(地球科学版)》2006,(Z1)

详细介绍了Elman神经网络的基本结构和数学模型,同时以地下水动态预测为例,给出用Elman神经网络建立地下水动态预测模型的方法。模型检验结果表明,该模型拟合和预测精度均较高,可应用于地下水动态系统的建模,借此说明Elman网络在地下水动态预报中的可行性,并为Elman网络技术在水文水资源领域的动态模拟应用提供借鉴。  相似文献   

基于VirtuoZo IGS数字测图的DEM的生成技术探讨   总被引：2，自引：0，他引：2  

柏春岚 《地理空间信息》2007,5(1):107-110

结合荆江河道区域的DEM生成过程,主要就基于VirtuoZo IGS数字测图生成DEM的技术进行了初步的探讨,找到了一些提高DEM生成效率的新方法,新思路。  相似文献   

成武县建设用地批后监管的分析探讨     

李秀荣  陈洁 《山东地质》2011,(6):48-50,53

建设用地供应审批之后,加强对其开发利用情况的跟踪监管,是落实节约集约用地政策、遏制违法违规用地的重要途径。成武县对新增建设用地严格规范出让合同的内容,加强对土地开发利用的监管;对已批存量建设用地,通过存量盘活、资源整合等一系列监管措施,有效促进了已供土地及时按规定开发,保证了各类住房及时建成,切实提高了土地供应和开发利用效率。  相似文献   

面向灾后水体遥感信息提取的知识决策树构建及应用     

陈超  傅姣琪  随欣欣  鲁旭  谭安辉 《遥感学报》2018,22(5):792-801

灾害发生以后,悬浮物质、波浪和水深等"同物异谱"会导致水体信息提取不完整,而阴影、沥青路面、浓密植被等"异物同谱"也会降低水体信息提取精度。针对此问题,提出一种特征知识引导的灾后水体信息提取方法。首先,分析水体遥感图像特征(光谱特征、几何特征、纹理特征、空间关系特征),构建灾后水体信息提取知识决策树;其次,对遥感图像进行面向对象分割,获取对象基元,并计算特征参数;然后,在知识决策树的支持下提取灾后水体信息;最后,对水体信息提取结果进行后处理,以去除噪声和填充孔洞。选取"5·12汶川地震"遥感图像开展验证实验,结果表明,水体信息提取结果位置准确,边界清晰,生产者精度和用户精度分别为0.85和0.94,该方法能够有效提取复杂背景下的灾后水体信息。  相似文献   

Micro-seismic Event Detection of Hot Dry Rock based on the Gated Recurrent Unit Model and a Support Vector Machine     

SUN Feng  HU Haotian  ZHAO F  YANG Xinran  CHEN Zubin  WU Haidong  ZHANG Linyou 《《地质学报》英文版》2021,95(6):1940-1947

Micro-seismic monitoring is one of the most critical technologies that guide hydraulic fracturing in hot dry rock resource development. Micro-seismic monitoring requires high precision detection of micro-seismic events with a low signal-to-noise ratio. Because of this requirement, we propose a recurrent neural network model named gated recurrent unit and support vector machine (GRU_SVM). The proposed model ensures high accuracy while reducing the parameter number and hardware requirement in the training process. Since micro-seismic events in hot dry rock produce large wave amplitudes and strong vibrations, it is difficult to reverse the onset of each individual event. In this study, we utilize a support vector machine (SVM) as a classifier to improve the micro-seismic event detection accuracy. To validate the methodology, we compare the simulation results of the short-term-average to the long-term-average (STA/LTA) method with GRU_SVM method by using hot dry rock micro-seismic event data in Qinghai Province, China. Our proposed method has an accuracy of about 95% for identifying micro-seismic events with low signal-to-noise ratios. By ignoring smaller micro-seismic events, the detection procedure can be processed more efficiently, which is able to provide a real-time observation on the types of hydraulic fracturing in the reservoirs.  相似文献   

应用人工干预措施减缓冰川消融试验研究——以达古冰川为例     

谢宜达  王飞腾  黄仕海  赵灿文 《冰川冻土》2021,43(6):1878-1887

自20世纪90年代以来,受全球气候变暖的影响,中国冰川呈现全面、加速退缩的趋势。冰川变化引发的水资源时空分布和水循环过程的变化无疑将给中国西部,尤其是西北干旱区的社会经济发展带来深刻影响。为了减缓冰川消融速率,提高中国适应气候变暖的能力,开展了一系列人工减缓冰川消融试验研究。具体是在2020年8月5日—10月17日,以达古17号冰川为研究标靶,进行人工干预减缓冰川消融试验,即在冰川表面覆盖光热阻隔物——土工织物,并在试验期间,观测了试验区域与非试验区域的冰川消融情况。结果表明：试验期内,试验区的冰川消融速率为0.011 m w.e.?d^-1,非试验区冰川消融速率为0.017 m w.e.?d^-1,试验区冰川消融速率明显低于非试验区;500 m²的土工织物使达古冰川试验区域减少了204 m³ w.e.的冰川消融,使得总消融量减少了34%;覆盖光热阻隔物虽能有效减缓冰川消融过程,但受成本、环境及人力等因素制约,仅可以向西北部小冰川或冰川旅游景点推广。本次人工干预减缓冰川消融试验在一定程度上填补了中国应对冰川消融工程措施方面的空白,为以后进行工程类减缓冰川消融的试验奠定了基础,但是目前还处于初步研究阶段,需要更多的控制性试验来验证其在未来更大的时空尺度上的有效性。  相似文献