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Spatial-temporal Dynamics and Driving Forces of Land Development Intensity in the Western China from 2000 to 2015 被引量:17
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作者 HUANG Xin HUANG Xiaojun +2 位作者 LIU Mengmeng WANG Bo ZHAO Yonghua 《Chinese Geographical Science》 SCIE CSCD 2020年第1期16-29,共14页
The change in land development intensity is an important perspective to reflect the variation in regional social and economic development and spatial differentiation.In this paper,spatial statistical analysis,Ordinary... The change in land development intensity is an important perspective to reflect the variation in regional social and economic development and spatial differentiation.In this paper,spatial statistical analysis,Ordinary Least Squares(OLS),and Geographically weighted regression(GWR)methods are used to systematically analyse the spatial-temporal characteristics and driving forces of land development intensity for 131 spatial units in the western China from 2000 to 2015.The findings of the study are as follows:1)The land development intensity in the western China has been increasing rapidly.From 2000 to 2015,land development intensity increased by 3.4 times on average.2)The hotspot areas have shifted from central Inner Mongolia,northern Shaanxi and the Beibu Gulf of Guangxi to the Guanzhong Plain and the Chengdu-Chongqing urban agglomeration.The areas of cold spots were mainly concentrated in the Qinghai-Tibet Plateau,Yunnan,and Xinjiang.3)Investment intensity and the natural environment have always been the main drivers of land development intensity in the western China.Investment played a powerful role in promoting land development intensity,while the natural and ecological environment distinctly constrained such development.The effect of the economic factors on land development intensity in the western China has changed,which is reflected in the driving factor of construction land development shifting from economic growth in 2000 to economic structure,especially industrial structure,in 2015. 展开更多
关键词 construction land land development intensity spatial-temporal dynamic driving force the western China
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Numerical Simulation of the Relationship between the Anomaly of Subtropical High over East Asia and the Convective Activities in the Western Tropical Pacific 被引量:40
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作者 黄荣辉 卢里 《Advances in Atmospheric Sciences》 SCIE CAS CSCD 1989年第2期202-214,共13页
In this paper, a close relationship between the intraseasonal variation of subtropical high over East Asia and the convective activities around the South China Sea and the Philippines is analysed from OLR data.This re... In this paper, a close relationship between the intraseasonal variation of subtropical high over East Asia and the convective activities around the South China Sea and the Philippines is analysed from OLR data.This relationship is studied by using the theory of wave propagating in a slowly varying medium and by using a quasi-geoslrophic, linear, spherical model and the IAP-GCM, respectively. The results show that when the SST is warming around the western tropical Pacific or the Philippines, the convective activities are intensified around the Philippines. As a consequence, the subtropical high will be intensified over East Asia. The computed results also show that when the anomaly of convective activities are caused around the Philippines, a teleconnection pattern of circulation anomalies will be caused over South Asia, East Asia and North America. 展开更多
关键词 OVER Numerical Simulation of the Relationship between the Anomaly of Subtropical High over East Asia and the Convective Activities in the western Tropical Pacific Asia
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^(226)Ra and ^(228)Ra in the Seawater of the Western Yellow Sea 被引量:6
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作者 MEN Wu WEI Hao LIU Guangshan 《Journal of Ocean University of China》 SCIE CAS 2006年第3期228-234,共7页
Radium isotopes 226Ra and 228Ra in seawater of the western Yellow Sea were measured by using the Mn-fiber adsorption - HPGe 7 spectrum method. The distribution features of the two isotopes have been studied. The activ... Radium isotopes 226Ra and 228Ra in seawater of the western Yellow Sea were measured by using the Mn-fiber adsorption - HPGe 7 spectrum method. The distribution features of the two isotopes have been studied. The activities of 226Ra and 228Ra are 2.72-5.57 Bq m^-3 and 7.51-34.3 Bq m^-3 respectively. The activities of 226Ra and 228Ra from surface to bottom for each depth profile station are comparable within the experimental error, but the mean activities decrease with distance from the shore. From the distribution data of 228Ra, the horizontal eddy diffusion coefficient was estimated at 29 × 10^6 cm^2 s^- 1. 展开更多
关键词 the western Yellow Sea ^226RA ^228Ra γ-spectrometry eddy coefficient
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Discovery of the 1.8 Ga Granite on the Western Margin of the Songnen Masiff, China 被引量:7
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作者 ZHANG Chao WU Xinwei +2 位作者 GUO Wei ZHANG Yujin QUAN Jingyu 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2017年第4期1497-1498,共2页
The Songnen masiff is located to the east of the Central Asian Orogenic Belt. The existence and rather the scale and nature of the Precambrian crystalline basement is controversial. Based on recent study of zircon U-P... The Songnen masiff is located to the east of the Central Asian Orogenic Belt. The existence and rather the scale and nature of the Precambrian crystalline basement is controversial. Based on recent study of zircon U-Pb chronology, besides a minor number of Neoproterozoic strata, most of the so-called Precambrian metamorphic rock series, such as the Dongfengshan Group and the Zhangguangcailing Group, were formed in the Mesozoic and Paleozoic. 展开更多
关键词 Th Pb Discovery of the 1.8 Ga Granite on the western Margin of the Songnen Masiff China GA
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Surface sediment diatoms from the western Pacific marginal seas and their correlation to environmental variables 被引量:5
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作者 黄玥 蒋辉 +3 位作者 Svante Bjrck 李铁刚 吕厚远 冉莉华 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 2009年第3期674-682,共9页
Diatom data of 192 surface sediment samples from the marginal seas in the western Pacific together with modern summer and winter sea surface temperature and salinity data were analyzed.The results of canonical corresp... Diatom data of 192 surface sediment samples from the marginal seas in the western Pacific together with modern summer and winter sea surface temperature and salinity data were analyzed.The results of canonical correspondence analysis show that summer sea-surface salinity(SSS) is highly positively correlated with winter SSS and so is summer sea-surface temperature(SST) with winter SST.The correlations between SSSs and SSTs are less positively correlated,which may be due to interactions of regional current pattern and monsoon climate.The correlations between diatom species,sample sites and environmental variables concur with known diatom ecology and regional oceanographic characters.The results of forward selection of the environmental variables and associated Monte Carlo permutation tests of the statistical significance of each variable suggest that summer SSS and winter SST are the main environmental factors affecting the diatom distribution in the area and therefore preserved diatom data from down core could be used for reconstructions of summer SSS and winter SST in the region. 展开更多
关键词 DIATOMS the western Pacific marginal seas environmental variables summer sea surface salinity winter sea surface temperature
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The First Quantitative Slip-Rate Estimated Along the Ashikule Fault at the Western Segment of the Altyn Tagh Fault System 被引量:5
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作者 PAN Jiawei LI Haibing +5 位作者 VAN DER WOERD Jerome SUN Zhiming SI Jialiang PEI Junling WU Fuyao CHEVALIER Marie-Luce 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2015年第6期2088-2089,共2页
As one of the longest strike-slip fault in Asia,the Altyn Tagh Fault(ATF)defines the northern boundary of the Tibetan Plateau and plays a significant role inaccommodating the deformation resulting from the IndiaAsia... As one of the longest strike-slip fault in Asia,the Altyn Tagh Fault(ATF)defines the northern boundary of the Tibetan Plateau and plays a significant role inaccommodating the deformation resulting from the IndiaAsia convergence. 展开更多
关键词 Asia Co the First Quantitative Slip-Rate Estimated Along the Ashikule Fault at the western Segment of the Altyn Tagh Fault System ATF rate
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Atmospheric Circulations and Sea Surface Temperatures Related to the convection over the western Pacific Warm Pool on the Interannual Scale 被引量:5
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作者 陆日宇 《Advances in Atmospheric Sciences》 SCIE CAS CSCD 2001年第2期270-282,共13页
The difference is examined in atmospheric circulation and Sea Surface Temperatures (SSTs) in the trop-ics and subtropics between weak and strong convection over the tropical western Pacific warm pool (signified as WPW... The difference is examined in atmospheric circulation and Sea Surface Temperatures (SSTs) in the trop-ics and subtropics between weak and strong convection over the tropical western Pacific warm pool (signified as WPWP). The WPWP is chosen as the region (110–160°E, 10–20°N), where the Outgoing Longwave Radiation (OLR) shows a great year-to-year variance. A composite study was carried out to examine the differences in atmospheric circulation and SSTs between weak and strong convection over WPWP. First, NCEP/NCAR re-analysis data and satellite-observed OLR data are used to examine the differences. ERA data, in which the OLR data are calculated, are then used for re-examination. The composite results show that the differences are remarkably similar in these two sets of data. The difference in circulations between weak and strong convection over WPWP is significantly associated with westward extension of the North Pacific subtropical anticyclone and stronger westerlies at the northwestern edge of the subtropical anticyclone. It also corresponds with the significant easterly anomaly and the descent anomaly in situ, i.e., over the WPWP. The most prominent characteristics of the difference of SSTs between weak and strong convection over the WPWP are the significant positive SST anomalies in the Indian Ocean, the Bay of Bengal and the South China Sea. In WPWP, however, there are only weak negative SST anomalies. Thus, the anomaly of OLR over WPWP is weakly associated with the SST anomalies in situ, while closely associated with the SST anomalies west of WPWP. Key words Convection over the western Pacific warm pool - Northwest Pacific subtropical high - Sea surface temperatures This study was supported by the “ National Key Programme for Developing Basic Sciences” G1998040900 Part 1. 展开更多
关键词 Convection over the western Pacific warm pool Northwest Pacific subtropical high Sea surface temperatures
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Widespread Methane Seep Activities along the Western Slope of the Okinawa Trough, East China Sea 被引量:2
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作者 LI Qing CAI Feng +7 位作者 YAN Guijing LIANG Jie SHAO Hebin WANG Meng DONG Gang WANG Feng SUN Yunbao LUO Di 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2017年第4期1505-1506,共2页
The westem slope of the Okinawa trough has been considered to experience important methane seep activities. Abundant terrigenous sediments supply and widely developed normal faults make this area an ideal place for me... The westem slope of the Okinawa trough has been considered to experience important methane seep activities. Abundant terrigenous sediments supply and widely developed normal faults make this area an ideal place for methane production, methane fluids migration and associated anaerobic oxidation of methane. 展开更多
关键词 than this Widespread Methane Seep Activities along the western Slope of the Okinawa Trough East China Sea SMI show AOM
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Geological conditions and key rock mechanics issues in the Western Route of South-to-North Water Transfer Project 被引量:2
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作者 XuechaoWang 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE 2011年第3期234-243,共10页
In terms of special geological conditions of the Western Route of South-to-North Water Transfer Project, the classification method for surrounding rocks is discussed by combining with the construction method of tunnel... In terms of special geological conditions of the Western Route of South-to-North Water Transfer Project, the classification method for surrounding rocks is discussed by combining with the construction method of tunnel boring machine (TBM). The classification standard of surrounding rocks is put forward on the basis of physical simulations and engineering practices. Damage, deformation and evolution of surrounding rocks induced by TBM excavation are discussed. Meanwhile, the long-term deformation mechanisms and stability of surrounding rocks are also studied. On this basis, a three-dimensional constitutive model for interbedded sandstone slate and a fiat shell-joint element-foundation system for calculating internal forces of segment lining are established. The deformation features of surrounding rocks of deep and steep interbedded sandstone slate and their influences on internal forces of segment lining are presented. Finally, the design methods of segment lining constructed in deep and steep flysch are proposed. 展开更多
关键词 the western Route of South-to-North Water Transfer Project rock mechanics issues classification of surrounding rocks stability of surrounding rocks excavation-induced damage lining design
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A New Chronological Report of the Hongshi Breccia-Host Gold Deposit in the Western Qinling Region,China 被引量:1
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作者 WANG Chenguang CAO Yi +2 位作者 SUN Tao LI Weigang ZENG Hao 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2017年第3期1149-1150,共2页
Objective The western Qinling belongs to the western part of the Qinling-Dabie-Sulu orogen between the North China Block and South China Block. Multiple orogenic events might be responsible for different types of gold... Objective The western Qinling belongs to the western part of the Qinling-Dabie-Sulu orogen between the North China Block and South China Block. Multiple orogenic events might be responsible for different types of gold mineralization, making the western Qinling gold region one of the most important gold metallogenic belts in China. This region has demonstrated a total gold resource of 〉500 t and more than ten gold deposits with gold resource of 〉20 t. Almost all gold deposits in the western Qinling gold region can be classified into two distinct genetic types as orogenic (such as the Shuangwang, 展开更多
关键词 of is as Gold A New Chronological Report of the Hongshi Breccia-Host Gold Deposit in the western Qinling Region China in
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Petrogenesis of I-type granites from Yuqikapa granite pluton of the western Kunlun orogen: Deformation-driven filter-pressing differentiation 被引量:1
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作者 WEI Xiaopeng WANG He +4 位作者 DONG Rui LI Pei Zhang Xiaoyu QIU Zengwang YAN Qinghe 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2017年第S1期98-99,共2页
1 Introduction The western Kunlun orogen,located in the northwest Tibet Plateau,and is a conjunction between the Pan-Asian and the Tethys tectonic domains.From north to south,the Western Kunlun orogen includes four
关键词 In Petrogenesis of I-type granites from Yuqikapa granite pluton of the western Kunlun orogen ICPMS type
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Modeling and Diagnostic Studies on the Variations of the Subtropical High over the Western Pacific from 1880 to 1999 被引量:1
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作者 王绍武 蔡静宁 +3 位作者 慕巧珍 谢志辉 朱锦红 龚道溢 《Advances in Atmospheric Sciences》 SCIE CAS CSCD 2002年第6期1148-1152,共5页
Index series of Subtropical High over the western Pacific was extended to AD 1880 by using of statistical and modeling method. Reconstructed indices by both methods show good accordance each other. Association of the ... Index series of Subtropical High over the western Pacific was extended to AD 1880 by using of statistical and modeling method. Reconstructed indices by both methods show good accordance each other. Association of the indices to the rainfall patterns over eastern China indicated the robustness of the reconstructions. 展开更多
关键词 subtropical high over the western Pacific MODELING DIAGNOSTICS
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INTERANNUAL VARIATION IN HEAT CONTENT OF THE WESTERN PACIFIC WARM POOL AND ITS EFFECT ON EASTERN ASIAN CLIMATE ANOMALIES 被引量:1
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作者 卢楚翰 黄露 +1 位作者 何金海 秦育婧 《Journal of Tropical Meteorology》 SCIE 2015年第3期246-254,共9页
Using the 1980-2010 winter GODAS oceanic assimilations, study is conducted of the winter heat content(HC) established in the subsurface layer(5 to 366 m in depth) over the western Pacific warm pool(WP), followed by in... Using the 1980-2010 winter GODAS oceanic assimilations, study is conducted of the winter heat content(HC) established in the subsurface layer(5 to 366 m in depth) over the western Pacific warm pool(WP), followed by investigating the HC spatiotemporal characteristics, persistence and the impacts on the climate anomalies of neighboring regions. Results are as follows: 1) the pattern of integral consistency is uncovered by the leading EOF1(PC1) mode of HC interannual variability, the year-to-year fluctuation of the time coefficients being well indicative of the interannual anomaly of the WP winter subsurface-layer thermal regime. The HC variation is bound up with El Ni觡o-Southern Oscillation, keeping pronounced autocorrelation during the following two seasons and more, with the persistence being more stable in comparison to sea surface temperature anomaly in the equatorial middle eastern Pacific; 2) the winter HC anomalies produce lasting effect on the WP thermal state in the following spring and summer and corresponding changes in the warm water volume lead to the meridional transport and vertical exchange of warm water, which exerts greater impacts upon the sea surface temperature/heat flux over the warm pool per se and neighboring regions, especially in the Philippine Sea during the posterior spring and summer; 3) the increase in the winter HC corresponds to the spring outgoing longwave radiation(OLR) decrease and richer precipitation over the waters east to the Philippine Sea and the resultant convective heating anomalies are responsible for the rise of geopotential isobaric surfaces over tropical and subtropical western North Pacific, thereby producing effect on the western Pacific subtropical high(anomaly). Subsequently, the sea-surface heat flux exchange is intensified in the warm pool, a robust anomalous cyclone shows up at lower levels, air-sea interactions are enhanced and abnormal convective heating occurs, together making the winter HC anomalies even more closely associated with the variation in the summer subtropical high. As a result, the WP winter HC can be used as an effective predictor of the variation in spring/summer western Pacific subtropical high and the strength of summer monsoon over the northwestern Pacific. 展开更多
关键词 heat content warm pool of the western Pacific SUBSURFACE spring barrier anomaly of eastern-Asian climate
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Variation of sulfate aerosol concentrations over the western Pacific and their effect on clouds, radiation and precipitation 被引量:1
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作者 F.Parungo J.Rosinski +1 位作者 M.L.C.Wu C.T.Nagamoto 《Acta Oceanologica Sinica》 SCIE CAS CSCD 1993年第4期521-534,共14页
Under bilateral cooperation between the United States of America and the People's Republic of China, a series of research cruises were conducted over the western Pacific Ocean. It was found that a) the non-sea-sal... Under bilateral cooperation between the United States of America and the People's Republic of China, a series of research cruises were conducted over the western Pacific Ocean. It was found that a) the non-sea-salt sulfate aerosol particles are the major source of cloud condensation nuclei, b) the population of clouds and the total albedo are proportional to the concentration of condensation nuclei and consequently to the concentration of the non-sea-salt aerosol particles, and c) the amount of rainfall is inversely proportional to the concentration of non-sea-salt sulfate aerosol particles. It seems that anthropogenic sulfate aerosol particles affect the regional planetary albedo and climate and that the contribution from biogenically derived sulfate aerosol particles is of lesser importance. 展开更多
关键词 data Variation of sulfate aerosol concentrations over the western Pacific and their effect on clouds radiation and precipitation OVER
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The effect of altimetry data in estimating the elastic thickness of the lithosphere in the western Pacific Ocean 被引量:1
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作者 Zheng Gong Peizhen Zhang +2 位作者 Wenjun Zheng Dongli Zhang Binbin Xu 《Geodesy and Geodynamics》 CSCD 2021年第5期315-322,共8页
The elastic thickness of the lithosphere(Te)is a key parameter used to describe the strength of the lithosphere.It is usually estimated by a spectral analysis between gravity and topography.In previous research on the... The elastic thickness of the lithosphere(Te)is a key parameter used to describe the strength of the lithosphere.It is usually estimated by a spectral analysis between gravity and topography.In previous research on the estimation of Te,altimetry data were used on both the gravity data and topography data,which could lead to deviations.The study described in this paper analyzed the effects of using gravity anomalies derived from different data sources on the estimation of Te,Taking the western Pacific region as an example,this study analyzed the impact of the repeated presence of altimetry satellite data on the calculation of the effective elastic thickness and found that if gravity anomalies and topography model both contain altimetry satellite data,they systematically overestimate effective elasticity.For a uniform area,the difference in Te can reach up to 30%.For a Te distribution,the difference can reach up to about16%.After eliminating this effect,the effective elastic thickness of the western Pacific region was found to be 10 km,and the statistical results of the effective elastic thickness distribution showed that the effective elastic thickness of the lithosphere in most areas of the western Pacific is about 12 km.The paper shows the importance of choosing the appropriate gravity model in evaluating the elastic thickness of lithosphere in the oceans.A figure of Te at seamounts with loading ages demonstrates that Te in the western Pacific is generally distributed within the 100-300℃isotherm depth and does not increase with loading age. 展开更多
关键词 the elastic thickness of lithosphere the western Pacific Ocean Altimetry data Spectral analysis
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Primary productivity in the western tropical Pacific and equatorial warm waters 被引量:1
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作者 Chen Xingqun 1,Zhang Ming 1,Chen Qihuan 1 ThirdInstituteofOceanography ,StateOceanicAdministration ,Xiamen 36 10 0 5 ,China 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2001年第1期117-129,共13页
Primary productivity in the western tropical Pacific and equatorial warm waters was studied in the WOCE cruise in November of 1991 and the TOGA-COARE cruise from November of 1992 to February of 1993.It is shown that t... Primary productivity in the western tropical Pacific and equatorial warm waters was studied in the WOCE cruise in November of 1991 and the TOGA-COARE cruise from November of 1992 to February of 1993.It is shown that the total amount of integrated chlorophyll a(chloro a)was 19 79 mg/m 2 in depthof0~150 m and the average daily primary productivity was 171 mg/(m 2·d)(C)appeared in the western tropical Pacific while a higher chloro a(21 68 mg/m 2)and primary productivity [228 mg/(m 2·d)(C)]were observed in the equatorial warm waters.The highest chloro a was found at the coastal stations of Philippines and Irian while the lowest chloro a was at the offshore areas bounded by 2°~4°N.The distribution pattern of chloro a biomass was related to different physical processes.Upwelling,which may have led to a high biomass, was a critical factor changing the distributions of temperature,salinity and nutrient in these areas. 展开更多
关键词 the western tropical Pacific equatorial warm waters chlorophyll a primary productivity distribution
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Newly Discovered Fluvial-Lacustrine Sediments in the Western Yangtze Block and their Geological Significance for the Emeishan Large Igneous Province 被引量:2
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作者 MABI Awei ZHANG Mingchun +3 位作者 YANG Zhengxi LI Yanlong WEN Dengkui LIU Xuyang 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2017年第2期741-742,共2页
Objective The Emeishan large igneous province (ELIP) in SW China is the only one large igneous province in China recognized by international geologists. Previous studies of ELIP over past two decades indicate that ... Objective The Emeishan large igneous province (ELIP) in SW China is the only one large igneous province in China recognized by international geologists. Previous studies of ELIP over past two decades indicate that the ELIP age, duration, scale and generation mechanism are still controversial. Among those scientific topics, some scholars suggest that ELIP is an example of up-doming prior to LIP formation, which was evidenced by: (1) The thickness of the Yangxin Formation (P^v) limestone unit, which lies directly beneath ELIP, reduces from the center of erosional area to the outer edge. (2) Paleo-karst surfaces are present. (3) The clastic rocks of alluvial fan deposits, from the eroded materials in the maximum uplifted area, developed surrounding the inner zone. However, other scholars urge that those so-called "alluvial fan" deposits are "hydromagmatic deposits", erupted or emplaced at or near sea level, and conclude that there was no pre-emptive uplift in ELIP. In order to constrain the above-mentioned scientific issue, we conducted detailed field geological investigations and systematically measured geological sections to provide new evidence by using sedimentary data. 展开更多
关键词 Newly Discovered Fluvial-Lacustrine Sediments in the western Yangtze Block and their Geological Significance for the Emeishan Large Igneous Province
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Go West——The Western China International Trade Fair for Textiles and Clothing will launch from 16^(th) to 19^(th) October, 2009. 被引量:10
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作者 Chen Si 《China Textile》 2009年第7期10-10,共1页
Sichuan, one of the most prosperous provinces in Western China, possesses an enormous potential of textile industry development. Currently, the western region is becoming a big mart and new manufacturing base in China... Sichuan, one of the most prosperous provinces in Western China, possesses an enormous potential of textile industry development. Currently, the western region is becoming a big mart and new manufacturing base in China textile industry for the reason of the abundant material resources, 展开更多
关键词 WILL Go West October the western China International Trade Fair for Textiles and Clothing will launch from 16 TH to 19
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An Empirical Study on E-commerce Service in the Western China’s Tourism Industry 被引量:1
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作者 程励 李仕明 甘露 《Journal of Electronic Science and Technology of China》 2005年第1期82-86,共5页
With the rapid development of China’s tourism industry, e-commerce will bring about new opportunity and challenge to tourism. Hotels and travel agencies play very important roles in tourism industry and their level o... With the rapid development of China’s tourism industry, e-commerce will bring about new opportunity and challenge to tourism. Hotels and travel agencies play very important roles in tourism industry and their level of application of IT prominently shows the management level and information process of whole tourism. This study uses content analysis to evaluate the web sites service of travel agencies and hotels in the Western China. Moreover, this paper puts forward strategic suggestion for the future development of tourism e-commerce in the Western China. 展开更多
关键词 E-COMMERCE tourism industry content analysis the western China
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Shear wave anisotropy in D” region beneath the western Pacific
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作者 戴志阳 刘斌 +3 位作者 王霄翔 查显杰 张虎 杨凤琴 《Acta Seismologica Sinica(English Edition)》 CSCD 2007年第5期489-496,共8页
Using seismic shear phases from 47 Tonga-Fiji and its adjacent region events recorded by the CENC and IRIS, and from 26 northeast Asia and north Pacific events recorded by IRIS, we studied the shear wave anisotropy i... Using seismic shear phases from 47 Tonga-Fiji and its adjacent region events recorded by the CENC and IRIS, and from 26 northeast Asia and north Pacific events recorded by IRIS, we studied the shear wave anisotropy in D" region beneath the western Pacific utilizing the ScS-S differential travel time method and obtained the splitting time values between the radial and transverse components of each ScS wave corresponding to each core-mantle boundary (CMB) reflection point. We found that most shear waves involved horizontally polarized shear wave components traveling faster than vertically polarized shear wave components through the D" region. The splitting time values of ScS wave range from -0.91 s to 3.21 s with an average value of 1.1 s. The strength of anisotropy varies from -0.45% to 1.56% with an average value of 0.52%. The observations and analyses show that in the D" region beneath the western Pacific the lateral flow is expected to be dominant and the vertical transverse isotropy may be the main anisotropic structure. This structure feature may be explained by the shape preferred orientation of the CMB chemical reaction products or partial melt and the lattice preferred orientation of the lower mantle materials caused by the lateral flow at lowermost mantle. 展开更多
关键词 ANISOTROPY shear wave splitting D" region ScS phase the western Pacific
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