NORTH CHINA EARTHQUAKE SCIENCE(VOL.19;2 0 0 1)

NO.1Q-value structure of the upper crust in Changbaishan Mt.Volcanic region…………Deng Hongzhao,Zhang Xiankang( 1 )……………………………………………………Study on the P and S wave velocity stucture under Tangshan region withdigital earthquake record Zhang xuemin,Shu peiyi et.al.( 1 0 )………………………The application of well-logging with P ang Swave in geotechnical engineering ……Liu Ganghe( 1 8)…………………………………………………………………………The macrointensity of Zhangbei …     

EARTHQUAKE RESEARCHIN CHINA General Contents,Vol.1 7(2 0 0 1 )

Ｎｏ .1ＴｈｅＥｆｆｅｃｔｏｆＨｅｔｅｒｏｇｅｎｅｉｔｙｏｎＲｏｃｋ’ｓＵｌｔｒａｓｏｎｉｃＡｔｔｅｎｕａｔｉｏｎａｎｄＩｔｓＣｏｒｒｅｃｔｉｏｎ………………………………………………　ＷａｎｇＢａｏｓｈａｎ　ＳｕｎＤａｏｙｕａｎ　ＬｉＳｈｅｎｇｊｉｅ　ＬｉＷｅｉｄｏｎｇ　ＳｈｉＸｉｎｇｊｕｅ　ＬｉｕＢｉｎ (1)………………………………………ＡｐｐａｒｅｎｔＳｔｒｅｓｓＯｂｔａｉｎｅｄｆｒｏｍＢｒｏａｄｂａｎｄＲａｄｉａｔｅｄＥｎｅｒｇｙＣａｔａｌｏｇｕｅａｎｄＳｅｉｓｍｉｃＭｏｍｅｎｔＣａｔａｌｏ…     

汶川8. 0 级和日本9. 0 级地震时甘肃境内井水位、井水温同震效应对比分析

通过对比研究发现,2008 年汶川8. 0 级和2011 年日本9. 0 级地震时甘肃境内台站井水位和井水温同震效应特征有明显差异:汶川8. 0 级地震时,绝大部分井水位和井水温都记录到同震效应,且变化幅度比较大,持续时间比较长;相比而言,日本9. 0 级地震虽然释放的能量更大,但因震中距和震源方位的影响,只有部分井水位记录到明显的同震变化,井水温没有明显变化;两次地震时古浪观测站井水位都记录到井水位变化,但日本9. 0 级地震时的变化幅度大于汶川8. 0 级地震,这一现象值得深入研究。     

A.—A. I. H. S.—I. A. S. H.

Abstract

When a river flows into a reservoir, the solid materials it carries sink to the bottom thus reducing the potential reservoir capacity. The suspended load of eight major western rivers flowing into Kainji Lake was determined as a part of the investigation of the suspended sediment of the reservoir. The sediment content in each sample was determined in parts per million.

On the whole the results of this study is in agreement with the previous conclusion that the sediment load of the Niger was low. A range of 29–221 ppm was observed within the reservoir whereas the concentration in the inflowing rivers varied from 122–953 ppm. It was however not possible to determine the total sediment load because discharge data were lacking.

The data presented herein confirm the earlier conclusion that the rate of silting is slow but indicate that locally high rate of sediment supply should give cause for anxiety regarding the possible growth of deltas as the months of these rivers.

The full potential of this study is difficult to assess at this stage but it has revealed a number of problem areas worth looking into in future years. A number of future studies believed to be capable of giving the necessary data for operation and management of the reservoir are recommended.