New national seismic zoning map of China     

高孟潭 《地震学报(英文版)》2003,16(6):639-645

1 Background of the new national seismic zoning map The policy of seismic disaster mitigation in the Chinese mainland is prevention first. According to the law, the earthquake design for ordinary structures must fit the demand of national seismic zoning map. Seismic zoning map is the basis of the earthquake design (TANG, 1998; WU, et al, 1998). The seismic zoning map must be updated with the progress in methodology and accumula-tion of the data. There are three generations of national seis…  相似文献   

Seismicity anomalies before the great earthquake of M_S=8.1 in the Kunlun Pass and its significance to earthquake prediction     

刘蒲雄  郑大林  车时  潘怀文  刘桂萍  杨立明 《地震学报(英文版)》2003,16(2)

Introduction The MS=8.1 earthquake occurred in west of the Kunlun Pass on November 14, 2001. It is the greatest earthquake occurred in China since the last half of the century and is an important event in recent seismic history of China. Some specialists consider that the earthquake occurred in the area where the earthquake monitoring capability is lowest in Chinese mainland; no striking precursory seismicity was found. The study on the precursory seismicity before the earthquake has not b…  相似文献   

3-D rheologic model of earthquake preparation (I)—Displacement field     

宋治平  尹祥础  梅世蓉 《地震学报(英文版)》2003,(6)

Introduction The rock medium shows mainly elastic character under low-temperature, low-pressure and external force for short duration, yet it shows rheologic property under high-temperature, high-pressure and long-time external force. It is reasonable that the rapid earthquake generating process lasted for tens seconds is analyzed by the elastic theory. As for the earthquake generating process for hundreds or thousand years, nevertheless, the rheologic property of rock must be taken into accou…  相似文献   

Paleocene deep-water sediments and radiolarian faunas: Implications for evolution of Yarlung-Zangbo foreland basin, southern Tibet   总被引：10，自引：0，他引：10  

丁林 《中国科学D辑(英文版)》2003,46(1)

Only a few Paleocene radiolarian assemblages have been reported, while the Early Paleocene zonal schemes remain poorly delineated. The Early Paleocene on-land radiolarians were described in the Hidaka melange belt of Japan and the North Island of New Zeal…  相似文献   

Synthesis of zeolites using fly ash and their application in removing heavy metals from waters   总被引：1，自引：0，他引：1  

王焰新  郭永龙  杨志华  蔡鹤生  Xavier Querol 《中国科学D辑(英文版)》2003,46(9):967-976

Fly ash is the solid waste of thermal power plants where coal is used as fuel, and its management and utilization have been of environmental concern for decades. Since the technique of synthesizing zeolite from coal fly ash was introduced by Holler[1] (19…  相似文献   

Scaling effects on modeled surface energy-balance components using the NOAH-OSU land surface model   总被引：3，自引：0，他引：3  

V. Sridhar  Ronald L. Elliott  Fei Chen 《Journal of Hydrology》2003,280(1-4):105-123

As surface exchange processes are highly non-linear and heterogeneous in space and time, it is important to know the appropriate scale for the reasonable prediction of these exchange processes. For example, the explicit representation of surface variability has been vital in predicting mesoscale weather events such as late-afternoon thunderstorms initiated by latent heat exchanges in mid-latitude regions of the continental United States. This study was undertaken to examine the effects of different spatial scales of input data on modeled fluxes, so as to better understand the resolution needed for accurate modeling. A statistical procedure was followed to select two cells from the Southern Great Plains 1997 hydrology experiment region, each 20 km×20 km, representing the most homogeneous and the most heterogeneous surface conditions (based on soil and vegetation) within the study region. The NOAH-OSU (Oregon State University) Land Surface Model (LSM) was employed to estimate surface energy fluxes. Three scales of study (200 m, 2 and 20 km) were considered in order to investigate the impacts of the aggregation of input data, especially soil and vegetation inputs, on the model output. Model results of net radiation and latent, sensible and ground heat fluxes were compared for the three scales. For the heterogeneous area, the model output at the 20-km resolution showed some differences when compared with the 200-m and 2-km resolutions. This was more pronounced in latent heat (12% decrease), sensible heat (22% increase), and ground heat flux (44% increase) estimation than in net radiation. The scaling effects were much less for the relatively homogeneous land area with 5% increase in sensible heat and 4% decrease in ground heat flux estimation. All of the model outputs for the 2- and 20-km resolutions were in close agreement. The results suggested that, for this study region, soils and vegetation input resolution of about 2 km should be chosen for realistic modeling of surface exchange processes. This resolution was sufficient to capture the effects of sub-grid scale heterogeneity, while avoiding the data and computational difficulties associated with higher spatial resolutions.  相似文献   

702 pp., 154 Tafeln und 1 CD-ROM. GebundenD.M. John, B.A. Whitton and A.J. Brook, The Freshwater Algal Flora of the British Isles: An Identification Guide to Freshwater and Terrestrial Algae 1. korrigierter Nachdruck 2003. Preis: Engl. Pfund 75,- (US-Dollar 125,-) (1. Auflage), Cambridge University Press (2002) ISBN 0-521-77051-3.     

The Freshwater Algal Flora of the British Isles: 《Limnologica》2003,33(4):375

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Strong earthquake activity all over the world and strong—moderate earthquake activity within and near China（August,2002～September,2002）     

陈培善 《地震学报(英文版)》2003,16(1):124-125

Illustration All the data in this catalog are chosen from the (Preliminary Seismological Report of Chinese Seismic Stations( “Its abbreviation is "Monthly Report"). The catalog includes the events of M≥4.7 in and near China and M≥6 all over the world. The "Monthly Report" is monthly compiled by the Ninth Section of Institute of Geophysics, CSB.  相似文献   

Temporal variations of shear-wave splitting in field and laboratory studies in China   总被引：1，自引：0，他引：1  

Yuan Gao  Stuart Crampin   《Journal of Applied Geophysics》2003,54(3-4):279

Observations of shear-wave splitting at seismic stations above a swarm of small earthquakes on Hainan Island, China, and other examples world-wide, suggest that the time-delays of split shear-waves monitor the build up of stress before earthquakes and the stress release as earthquakes occur. Rock physics experiments on marble specimens also show variations of shear-wave time-delays with uniaxial pressure analogous to the field observations. The rock experiments show an abrupt decrease in time-delays immediately before fracturing occurs. Similar precursory behaviour has been observed before earthquakes elsewhere, and is believed to be important for two reasons. Precursory changes in shear-wave splitting could be used for short-term forecasting, but of greater importance may be the information such behaviour provides about the source processes in earthquake preparation zones.  相似文献   

Study of Triggering Action Between the Mani （Ms7.9） and the West Kunlun Mountains Pass （ Ms 8.1 ） Great Earthquakes and Their Dynamic Background     

Chen Bing  Jiang Zaisen  Che Shi  WANG Qingliang  Zhu Guizhi  Wang Jiying 《中国地震研究》2003,17(3):199-205

Based on Coulomb static stress variation, the stress trigging action of the Mani ( Ms7.9, Nov.1997) earthquake on the West Kuulun Mountains Pass (MsS.1, Nov. 2001 ) earthquake is researched. Results of different source mechanism resolutions show that a 10_3 MPa Coulomb stress due to the Mani earthquake was added to the fracture fault of the Kunlun earthquake, and this may shift the broken date to about 10 years earlier, and infer that the stress level in the crust is not low. Comparing the relationship between strong earthquake strength and frequency and earth rotation change, it is shown that the strength‘s decrease and the variation period‘ s shortening of earth rotation are important controlling factors on strong earthquake activity. This great event with Ms = 8.1 took place probably due to a gradual strengthening background of regional stress field within the Qinghai-Xizang block in the period of acceleration of change of day‘s length and stress triggering from the Mani earthquake.  相似文献