乌恰地震加速度记录特征研究   总被引：1，自引：0，他引：1  

宋和平  柔洁 《内陆地震》1990,4(3):239-246

研究了1985年乌恰余震取得的加速度记录,从地质及地球物理的角度探讨一些加速度异常点。分析了记录的峰值加速度与震害及场地烈度的对应关系。对比了竖向和水平向加速度、速度反应谱及谱与震级的变化特征。  相似文献   

用时间序列模拟和预报天山乌鲁木齐河源1号冰川年径流总量     

宋强  陈靖 《冰川冻土》1990,(2)

本文把1958—1984年天山乌鲁木齐河源1号冰川的融水径流总量的时间序列X(t),分解为趋势项L(t)、周期项P(t)、平稳项S(t)、随机项ε(t),使该时间序列表示为X(t)=L(t)+P(t)+S(t)+ε(t)。采用非线性回归提取L(t),用谱分析和Fourier级数提取P(t),余差用自回归方程建模,用上述项的叠加作出预报,按相关指数公式计算R=0.90,效果良好。  相似文献   

伴随我国一些大地震的电离层异常现象   总被引：1，自引：0，他引：1       下载免费PDF全文

李海华  刘德富  宋笑亭 《地震工程学报》1984,6(3):1-11

本文初步总结了伴随我国一些大地震前后电离层的异常现象,结果表明,临震前电离层形态扰动异常是比较普遍的现象;其次是F层“高点位移”的时空分布异常。它们可能与电离层局部生成不均匀电子“云块”有关,以及与震前地磁场、地电场及地面电学性质有关。进一步观测和研究电离层异常现象将有助于估计强震的大致地区和临震时间。文中还就电离层—地磁场—地震关系进行了初步的讨论,指出电离层与地震的联系可能是由于地磁场耦合作用。  相似文献   

中国地壳与上地幔结构的地球物理研究   总被引：1，自引：0，他引：1       下载免费PDF全文

滕吉文  魏斯禹  刘桂英  宋仲和  张少泉 《地震工程学报》1983,5(4):70-85

地壳与上地幔是人类居住与获取各种资源、能源,改造和利用自然的重要场所,是地球科学的基础与生长点,六十年代以来发展迅猛。中国大陆、海域和过渡带地区的地壳和上地幔物理探索,在全球板块构造和驱动机制的研究具有特殊地位,文中分别就1)青藏高原地区的地壳结构,2)青海、甘肃地区地壳结构和地壳中的高速块层,3)中原地区的地壳与上地幔结构,4)京津及外围地区的地壳结构,5)隋县—南京—启东和隋县—安阳人工地震探测面的观测,6)利用面波和远震P波确定中国地壳和上地幔结构,7)中国地壳结构的基本轮廓等方面进行了讨论。  相似文献   

天津蓟县盘山石英二长岩体的Rb—Sr同位素年龄及其地质意义          下载免费PDF全文

王玉富  李义  张绍宗  张祥  宋明哲 《地质找矿论丛》1988,(3):90-93

盘山的石英二长岩体曾一直被认为系燕山期侵入体,经Rb—Sr测定结果,其同位素年龄为235.152Ma,应属海西晚期。  相似文献   

Kalman滤波在黄河上游融雪期径流预报中的应用初探   总被引：1，自引：1，他引：1  

宋强 《冰川冻土》1991,13(1):27-34

  相似文献   

地震反应分析中的主时段     

柔洁  宋和平 《内陆地震》1991,5(1):42-47

在计算反应谱及土层反应时,发现反应谱的形态和大小只受时程的主要部分控制,由此给出主时段的定义和确定主时段的方法。主时段的应用不仅可以大大缩短计算时间,而且能够成为持时的一种有物理意义的度量。  相似文献   

Fouling of floating plastic debris under Biscayne Bay exposure conditions     

Song Ye  Anthony L Andrady 《Marine pollution bulletin》1991,22(12):608-613

Six plastic/rubber materials commonly encountered in marine debris and beach litter were studied under Biscayne Bay (Florida, USA) exposure conditions to determine the effect of fouling on buoyancy. Studies under restricted floating, and restricted submerged exposure conditions suggest that most plastic samples undergo fouling to an extent to cause the sample to be negatively buoyant in sea water. Rapid defouling of the submerged fouled samples was observed. The findings suggest that free-floating plastics at sea may, under certain conditions, undergo fouling-induced sinking followed by resurfacing as floating debris.  相似文献   

灵台-阿木去乎剖面地壳速度结构          下载免费PDF全文

闵祥仪  周民都  郭建康  魏德晴  张元生  侯晓钰  宋杰 《地震工程学报》1991,13(S1):29-36

在Ⅰ测线观测资料的基础上,本文结合测区特点给出了高程校正及沉积层校正方法,利用反射波与莫霍面折射波运动学特性进行一维、二维地壳结构的正、反演计算,获得了自甘肃夏河至灵台460公里范围内的分层地壳结构,认为西部地壳厚度约51公里,东部仅为44公里,已属鄂尔多斯地台区结构,与地槽区的分界线大致对应地表陇县固关镇。武山与张家川之间在15-20公里深处存在低速层。结合地震波的动力学特性,可判定本测线通过的超壳断层有鄂尔多斯西缘-六盘山断裂、西秦岭北缘断裂和武山南北向断裂。  相似文献   

Minor elements and ore genesis of the Fankou lead-zinc deposit,China   总被引：3，自引：0，他引：3  

Song Xuexin 《Mineralium Deposita》1984,19(2):95-104

The Fankou Pb-Zn deposit occurs in the Middle-Upper Devonian and Lower Carboniferous carbonate and argillaceous carbonate formations. In principle, the deposit can be classified as a carbonate-hosted strate-bound deposit. Representative sphalerite, galena, and pyrite separates from Fankou have been analysed. For the purpose of comparison a literature survey on minor elements of other districts have been carried out. The comparison of determined data with the quoted data shows that the Fankou sphalerites are rich in Ga, Ge and Ag, but poor in Se and Te; the Fankou galenas are rich in Ag, Hg, Sb and As, but poor in Se, Te, Tl and Bi; the Fankou pyrites are rich in As, Cd and In, but poor in Se, Te, Co and Ni. Zn/Cd and Se/S×10^–4 ratios for sphalerites, Sb/Ag, Sb/Bi and Se/S×10^–4 ratios for galenas and Co/Ni ratios for pyrites from Fankou and other districts have been calculated. Ga-Ge-Ag atomic ratios in sphalerites, Sb-Bi-Ag atomic ratios in galenas and Co-Ni relations in pyrites have been plotted. The average value (311) of Zn/Cd ratios for sphalerites from Fankou is similar to values of sphalerites from Gaobanhe, Heqing, Accesa and Broken Hill. The average Sb/Ag ratio (0.74) and the Sb-Bi-Ag atomic ratios in Fankou galenas are similar to those in the syngenetic galena from the British Island. The Ga-Ge-Ag atomic ratios for Fankou sphalerites are similar to those for the syngenetic sphalerites and Gorno sphalerites. The average Co/Ni ratio (1.1) for micro to fine-grained pyrites from Fankou laminated-bedded pyrite ore is similar to that (0.8) for the sedimentary pyrites from other districts. As to the fine to medium-grained pyrites from Fankou massive pyritic ores, their higher Co/Ni ratios (1.6–1.8) may relate to the fact that more Ni is lost than Co, during the reformation or recrystallization. Sphalerite, galena and pyrite from Fankou all are rather poor in Se and have very low values of Se/S×10^–4, so they may bear no genetic relation to volcanism. To sum up, the following conclusions can be reached: (1) The Fankou deposit possesses some syngenetic features. (2) Evidently it differs from skarn type, hydrothermal type, and volcanogenic type deposits. (3) Surely it is a reformed sedimentary Pb-Zn deposit.  相似文献