Dynamic evolution patterns of the degree of ground resistivity anisotropy and the sets mogenic process     

毛桐恩  胥广银  范思源  赵明  孙景芳 《地震学报(英文版)》1999,(2)

IntroductionTothefinalanalysis,earthquakepredictionisstillamarginalscienceofextremedifficultyintheworld.Tomakesomebreakthroughorpromoteearthquakeprediction,itisnecessarytostrengthentheresearchonnewtrainofthinking,newtheoryandnewmethods.Theresearchontheanisotropyofcrustalmediaduringtheseismogenicprocesshasbeentakenmoreandmoreseriouslybyseismologists.Inthepast,manyscholarsoftenmadestudiesonthefeaturesofmediainresponsetoseismicwavesandachievedsomeprogress(Teng,etal,1992).Thispaperstudiestheelect…  相似文献   

Dynamic evolution patterns of the degree of ground resistivity anisotropy and the seismogenic process     

TONG-EN MAO  GUANG-YIN XU  SI-YUAN FAN  MING ZHAO  JING-FANG SUN 《地震学报(英文版)》1999,12(2):199-206

Following a new train of thinking, this paper has explored first the potential information in the ground resistivity data observed by the existing geoelectric observation system, investigated and proposed a new dimensionless geoelectric precursor factor, the degree of ground resistivity anisotropy, S, and studied the characteristics of dynamic evolution pattern of S during the seismogenic process. The results show that, during the seismogenic process, the degree of ground resistivity anisotropy (S) displays a process of 'normal' →'abnormal strengthening (amplitude, range)' →abnormal weakening' → 'earthquake occurrence'→ 'normal'. The earthquake would occur at the time when the S value has entered the late stage of strengthening and turns to weaken and in the gradient belt on the margin of S anomaly region. The dynamic evolution pattern of S reflects the changes of the tectonic stress field during the seismogenic process. Therefore, it would be possible to trace the process of earthquake generation and occurrence from the dynamic evolution pattern of S so as to service earthquake prediction.  相似文献   

前兆群体非均匀度异常与地震短期预报   总被引：11，自引：2，他引：9  

石绍先  曹刻 《地震》1999,19(1):59-64

通过对滇西地震预报实验场和腾冲－龙陵地震区常用前兆群体非均匀度进行系统计算和分析研究。结果表明前兆群体非均匀度异常是小概率事件,其异常时间提前量平均为５１天,在二个震区１３．５年的研究时段中地震报,仅漏过２次Ｍ≥５．０地震;前兆群体非均匀度异常比单项前兆异常有较多的近源短临信息,可能发展成为一个新的短临预报方法。  相似文献   

中国东部深源包体和新生代辉石地温的研究     

李有柱 《矿物岩石》1999,19(1):9-14

中国东部新生代宏玄武岩广泛发育,它们在时间和空间上表现为明显的分带。在新生代玄武岩中赋存着丰富的地幔碎裂－二辉橄榄岩包体和高压巨晶,为研究上地幔组成和岩浆演化提供大量信息。人选必其他研究者的资料,从岩石学,矿物学,地球化学及热力学的观点,对中国东部新生代玄武岩中赋存的深源包体和新生代辉石地温进行探讨。  相似文献   

模糊优选神经网络模型及其应用   总被引：14，自引：1，他引：13       下载免费PDF全文

陈守煜 《水科学进展》1999,10(1):69-74

给出一种能反映宏观决策意图的模糊优选神经网络模型,经用于大连市经济与水资源、环境可持续发展决策,取得了满意结果。  相似文献   

温州沿海地区城镇化带型发展的机制与规律   总被引：6，自引：1，他引：5  

刘彦随 《地理研究》1999,18(4):2-419

以温州乐清市为例, 对沿海地区城镇化带型发展动因机制及其规律进行了初步探讨, 揭示了城镇体系演化与交通区位变化的相关关系。通过运用城镇化综合度指标, 在研究城镇体系结构的基础上, 建立了城镇化扩展域模型, 并深入分析了一定时期城镇化带型发展与区域经济实力和人口规模之间的相关性, 对于指导城镇规划和区域土地利用优化配置的实践, 具有重要的意义  相似文献   

环境与经济协调发展的定量评判及其分类体系——以珠江三角洲城市群为例   总被引：31，自引：0，他引：31  

廖重斌 《热带地理》1999,(2)

环境与经济的协调发展是实现可持续发展的重要途径。文中通过对协调、发展及协调发展这３个概念的定义和论述,分别推导出协调度和协调发展度的计算模型,并用协调度和协调发展度的大小等作为评判标准,将环境与经济协调发展状况划分为从简洁到详细不同的３个层次,共３０种基本类型。最后还以珠江三角洲城市群为评价对象,给出了上述计算方法和分类体系的应用实例,同时证明其可靠性  相似文献   

地区综合实力的灰色聚类评价   总被引：6，自引：0，他引：6  

冯利华 《地域研究与开发》1998,(Z1)

根据灰色聚类分析的原理与方法,对金华市等县（市）社会经济发展进行了灰色聚类分析,确定了该地区各县（市）综合实力的等级,为进一步深化改革、持续发展提供重要的依据  相似文献   

广西石山区可持续发展的综合评价　Ⅰ.指标体系和评价方法   总被引：1，自引：0，他引：1  

胡宝清  任东明 《山地学报》1998,(2)

根据区域可持续发展理论和广西石山区的实际,为欠发达地区制定出一套典型区域的可持续发展综合评价指标体系和综合评价方法.  相似文献   

Fast computation of satellite gravitational gradient     

Lin Qinchang  Lin Yuan 《Celestial Mechanics and Dynamical Astronomy》1998,71(3):157-166

The computation of the Earth's potential function at high order and degree with the method of reference [1], causes overflow most of the time. The normalized method [2–6] can eliminate the overflows, but leads to formulae much more involved than those in reference [1]; besides, the programming is more complex and the computer time required larger. The method presented in this paper has the following features: each component of the satellite gravitational gradient can be computed; the formulae are short and easy to be programme; the method is much quicker than the normalization method and can be carried out with a micro‐computer, without overflow even in the case of Earth's spherical harmonics of order and degree as high as 1025 or higher. This method satisfies the present demand to compute satellite gravitational gradient with high accuracy. Furthermore, we present formulae for the fast computation, without overflow, of the gravitational gradient corresponding to Earth's spherical harmonics up to order and degree of 3170 × 3170 or higher. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献