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the mainland
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  大陆
    HOMOGENEOUS MAGNITUDE SYSTEM OF THE MAINLAND CHINA
    中国大陆地区的均一震级系统
短句来源
    P-WAVE VELOCITY STRUCTURE OF THE UPPER MANTLE ON THE MAINLAND AND THE MARGINAL SEAS OF CHINA
    中国大陆和边缘海的上地幔P波速度结构
短句来源
    The Distributions of the Tilt Load Tides in the Mainland of China Caused by the Global Oceanic Tide Constituent M_2
    全球海潮M_2分波在中国大陆产生的地倾斜负荷潮
短句来源
    The Strong—Aftershock Active Analysis In Ten Years After Any Main Shock On The mainland of China
    中国大陆主震后十年内的强余震活动分析
短句来源
    MAPPING GRADIENT OF VERTICAL CRUST MOVEMENT IN THE MAINLAND OF CHINA
    中国大陆地壳垂直运动梯度图的编绘
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  大陆地区
    HOMOGENEOUS MAGNITUDE SYSTEM OF THE MAINLAND CHINA
    中国大陆地区的均一震级系统
短句来源
    All kinds of anomalies provided by the weekly, monthly and yearly seismic symposiums are used comprehensively to study the application of the frequency of the precursors to earthquake prediction within the mainland of and China spatial temporal evolution of seismicity.
    依据中国地震局分析预报中心的周、月会商会和年度会商会所提供的综合前兆异常,即震前所提出的各类前兆异常,研究了中国大陆地区内的综合前兆异常月频次在地震预报中的应用和时空演化特征。
短句来源
    The results indicate that (1) Average Pn velocity in Xinjiang region is 8.2 km/s, which is higher than the average 8.0 km/s for the mainland of China. The velocity varies from -0.3 km/s to 0.2km/s.
    主要结果是 :①新疆地区平均Pn速度为 8 2km s ,高于中国大陆地区的平均值 (8 0km s) ,速度变化量从 - 0 3km s到 0 2km s.
短句来源
    Based on the method, the variation of the coefficient with 22 years cycle and 10 years cycle from 1890 to 2002 in the mainland of China is analyzed. The results show that the seismic active period and the occurrence of M≥7.5 earthquakes were mainly at the descending segment of the coefficient with 22 years cycle, whereas, the quiet period was at the ascending segment.
    应用该方法对中国大陆地区1890~2002年22年左右与10年左右周期(活跃期与平静期组成一个周期)内地震活动周期系数的变化过程进行了分析,结果表明,中国大陆地区的地震活跃期及7.5级以上地震的发生时段处于22年周期系数曲线的下降过程中,而平静期则与周期系数曲线的上升过程相对应。
短句来源
    Homogeneous magnitude system of the mainland China has been made from the data of SK instrumental network, using the method that together obtain earthquake magnitude, calibration function and correction of the site condition. Four new calibration functions have been obtained for P-wave PZ, PⅡ, and S-wave SH, SV from the distance of 2.5° to 100° degree. 21 corrections of the site condition are also obtained.
    用 SK 地震仪台网的资料,用联合确定地震震级、量规函数和台基校正值的方法,做出了中国大陆地区的均一震级系统,得到了 PZ、PH、SH、SV 四个震相从2.5°—100°新的量规函数,以及我国21个基准台的台基校正值.
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    The spatial characteristic of the short term and imminent anomalies of water radon before earthquake in the mainland of China
    The spatial characteristic of the short-term and imminent anomalies of waterradonbe┐foreearthquakeinthemainlandofChina
短句来源
    Huchaoshan Landslide locates in the north hill of the Pinghong Highway from 12k+704 to 12k+884,the only road to the mainland.
    虎潮山滑坡位于平宏公路12k+704~12k+884段北侧山坡体上,是平潭海岛通往陆地的唯一公路通道。
短句来源
    The Temporal and Spatial Features of the Successional Earthquakes Occurring in the Mainland of China
    我国大地震发生后继发强震的时空分布特征
短句来源
    This paper discussed the cause of the higher prediction and lower activity in re -cent estimations of the strong earthquake tendency in the mainland of China.
    本文对我国近几年强震活动趋势估计出现高预报和低活动的原因进行了探讨。
短句来源
    2. seven regions of sedimento-minerogenetic series in the mainland of China;
    (2)中国大陆的7个沉积成矿系列区域;
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  the mainland
The genetic differences between the fish from Nandujiang River and those from the mainland indicated that they were separated early.
      
From September 2001 to 2003, a total of 1077 cases of SPH distributed in 135 hospitals all over the mainland of China were included for analysis.
      
Distribution of water vapor content (WVC) and its seasonal variation over the mainland of China
      
Based on the meteorological data of 105 aerological stations during the period of 1960-1969, the monthly average water vapor content (WVC) in air column over the mainland of China is calculated.
      
In the second population, located on the mainland (Herdsman Lake), snakes feed mostly on frogs (small prey).
      
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Ⅰ. General SKETCH The Cenozoic basalt lavas are widely distributed along the coastal regionand its adjacent districts in eastern China. They form either widespread plateausor scattered mesa-like hills; and, in some places, the volcanic craters are stilladmirably preserved to-day. These basalt sheets were erupted extensively in lateTertiary and early Quaternary times. They belong to the multiple-vent basalts,but not the plateau basalt in the type of eruption. In this paper are given the results of a petrochemical...

Ⅰ. General SKETCH The Cenozoic basalt lavas are widely distributed along the coastal regionand its adjacent districts in eastern China. They form either widespread plateausor scattered mesa-like hills; and, in some places, the volcanic craters are stilladmirably preserved to-day. These basalt sheets were erupted extensively in lateTertiary and early Quaternary times. They belong to the multiple-vent basalts,but not the plateau basalt in the type of eruption. In this paper are given the results of a petrochemical study of the Ceno-zoic basalt in eastern China. Geological and petrographical studies of the basaltsare not described in detail. Judging from the chemical compositions, the mostoutstanding characteristic feature of the most basaltic rocks is the richness inalkalis, especially in K_2O, also the undersaturation in silica, and, therfore,the most of the basalts distinctly belong to the alkaline rock suite. Such chemicalcharacters are closely related to modal compositions. The general petrogra-phical characters of the basalt may be now as well described. In North Chinaand South Manchuria most basalts are trachy basalt and its allied types, andoccasional nepheline basalt. The constituent minerals of these basalt are cha-racterized by the presence of anorthoclase, potash-adesine, plagioclase, titanaugite,as well as by the abundance of olivine. In South China the main basalt is olivinebasalt, consisting of olivine, augite, and plagioclase as usual. At some placesthe basalt may be slightly silica saturated that the occasional presence of hyper-thene and quartz (xenocryst) is noteworthy. In North Manchuria the dominant basalt is leucite basalt, containing leucite and olivine as phenocryst and groundmass constituent. Xenocryst of quartz and feldspar grains are sometimes present.In Taiwan Province, basalt of Kuanyinshan volcano is of the tholeiite type,but, in some other districts, the alkaline basalt with feldspathoidal constituentalso occurs. In view of the above-mentioned facts, the petrographical difference seemsto be matched by the differences of the major tectonic forms of China. Thesefacts may be tabulated below: Geographical region Tectonic forms Basalt type 1. North Manchuria Granitized region in Varisclde Leucite basalt 2. North China & South Precambrian Sino-Korean Trachybasalt Manchuria massive 3. South China Huanan platform in Yenshanide Olivine basalt 4. Taiwan Himalayide Tholeiite basalt Ⅱ. Regional INVESTIGATION In Table 1 the chemical analyses of the Cenozoic volcanic rocks in easternChina published up to 1951 were collected, of which 74 analyses are basalticrocks. The available analyses of every basalt sheet are taken an average to re-present the regional composition of the basaltic rocks. The localities of the basaltsheets where the analyzed chemical data are referable are shown in Figure 1.In all, 21 localities of basalt are investigated. The average chemical compositionsof each basalt locality, together with the normative minerals, Niggli's valuesand Zavarickij's numbers are given in Tables 2 A and 2 B respectively (localnos. in Table 2 correspond to the numerous in circle in Figure 1). For theconvenience of comparison, the average chemical composition of some standardbasalts (after S. R. Nockolds, 1954), some alkaline basalt in New Zealand (afterW. N. Benson, 1944) and Uganda (after A. Holmes, 1937), and the world's ba-salts, together with the normative minerals, Niggli's values and Zavarickij'snumbers of our calculation, are selected and given in Tables 3A, 3B, 7A, 7Brespectively. As mentioned above, the chemical composition of eastern China basalt ischaracterized by the high content of alkalies, and especially the K_2O. This cha-racter is definitely revealed by the normative feldspar, which is given in Table2 A and graphically shown in Figure 2. From this graphical representation,it is recognized that the normative feldspar becomes increasingly enriched ormolecular from South China to North Manchuria. Although the projected points appear to be scattered, a trend of clustering of the normative feldspars in accor-dance with its geographical distribution is apparent upon close inspection. Inthe normative pyroxene diagram, Figure 3, it is shown that most basalts of easternChina are rich in Wo molecular, falling near the Di-Hd line; On the otherhand, those of Kuanyinshan basalts of Taiwan Province are poor in Wo andcluster in the central part of the Di-Hd-Fs-En field. Therefore, that the easternChina basalt, excluding that of Kuanyinshan, belong to the alkaline rock suiteis justified. The comparison diagrams of qz, al-alk, C-(al-alk) and K-mg ofNiggli's values, based on the data given in Tables 2 B, 3 B, and 7 B, are gra-phically shown in Figs. 4, 5, 6 and 7 respectively. As will be seen from thesefigures, in general, the qz and al-alk of Niggli's value are lower, but C-(al-alk) and K-mg are higher than those of some common basalts. Fig. 8 isZavorickij's petrochemical vector diagram, from which the petrochemical cha-racters of high alkaline property in eastern China basalts are clearly justified. Ⅲ. Serial COMPARISON For ascertaining and understanding the general chemical characters, theCenozoic eastern China basalt and its differentiated associations are divided,based on the SiO_2 content, into 5 chemical types, the average composition ofwhich is given in Table 5A. As the chemical composition of Kuanyinshanvolcanic rocks in Taiwan Province shows a distinct calc-alkaline affinity, it is,therefore, dealt with the same procedure as well. The average chemical compo-sition of the volcanic rocks is given in Table 5 B. Since the Cenozoic basalt ineastern China covers the region adjacent to the Circum-Japan Sea and the Ja-panese Archipelagoes which are well known by the occurrence of alkaline andcalc-alkaline rock suite respectively. The serial variation in the chemical com-position of eastern China volcanic rocks is examinated in comparing them withthose of the Circum-Japan Sea and the Japanese volcanic rocks. The data usedfor the Circum-Japan Sea and Japanese rocks, which are given in Tables 6 A and6 B, are based on Tomita's and Yamada's calculated results respectively. Zavaric-kij's number of the same rocks, based on Zavarickij's data, is given in Table6 C. Following various petrochemical methods, some graphic diagrams are cons-tructed in order to express the chemical characters of the rock series of easternChina more definitely. The difference in chemical composition as comparedwith the Circum-Japan Sea alkaline rock suite is shown in the normal varia-tion diagram Figure 9. Other petrochemical indices (proposed by Peacock, Hol- mes and Tomita respectively) obtained are summarized below: Ⅰ Ⅱ Ⅲ Ⅳ alkali-lime index (Fig. 10) 65.5 59.0 63.0 52.0 alkali-alumina index (Fig. 11) -- -- 67.8 63.3 Ol-Q index (Fig. 12) 20.0 43.0 72.5 76.5 Ne-Hy index (Fig. 13) -- -- 55.0 59.9 Di-C index (Fig. 14) 46.5 46.5 -- -- Ⅰ. Japanese volcanic rocks; Ⅱ. Taiwan volcanic rocks; Ⅲ. Circum-Japan Sea alkaline suite; Ⅳ. eastern China volcanic rocks.From these graphical solutions in Figs. 10-14, it may be justified that thevolcanic rocks in eastern Asia have increasingly enriched the alkali contentfrom the Japanese Archipelagoes to the mainland of China. Figure 15 is avariation diagram of the normative feldspar of the eastern China series, incomparison with that of the Circum-Japan Sea region, the Japanese Archipela-goes and New Zealand. As will be seen from the diagram, the variation of thenormative feldspar of eastern China rock series is quite discriminative. Notonly is it richer in or molecular, but the positions of point N and O (corres-pond to the respective Ol-Q and Ne-Hy indices as shown in Figs. 12 and 13)of the eastern China series are also in a later course than the others. Figure 16is a paragenetic diagram of the normative plagioclase and pyroxlene of theeastern China series. In the variation diagram of the normative pyroxene, Fig.17, the distinct difference in the course of variation between the alkaline andcalc-alkaline series is clearly revealed. In this connection, the directon of varia-tion in the normative pyroxene of the alkaline series differs from that of thecalc-alkaline series. It is also notable that the range of variation in the easternChina series is smaller, due to the presence of higher Wo molecular in bothbasic and acidic types, as compared with that of the Circum-Japan Sea series.Figure 18 is Zavarickij's petrochemical vector diagram of the eastern Chinaseries compared with that of Circum-Japan Sea and Japanese series. It may be acomplemental diagram of the serial comparison diagram of eastern Asia volcanicrock series, prepared by Zavarickij (cf. A. N. Zavarickij's Introduction to Petro-chemistry of Igneous Rocks, 1950, Fig. 61, p. 205, in Russian). The distinctdifference of these rock series may be clearly observed in the graphical solution.In Table 7 A is given the average chemical composition of eastern China basalt,together with the composition of basaltic rocks of the world (including olvinebasalt and Toleiite, Ocean basalt and Continent basalt) for comparison. Theeastern China average is very similar to the average composition of the olivine- basalt of the Circum-Japan Sea region (based on Tomita, 1935, and recalculatedby the writer), while it differed more or less from that of any of the world'sbasalts by the high content of alkali and especially K_20. This character isdefinitely revealed by the normative feldspar and pyroxene, which are graphi-cally shown in Figs. 19 and 21 respectively. Figure 20 is Zavarickij's petroche-mical diagram of the world's basalt. As shown in these diagrams, it suggests atransitional relation rather than a sharp cleft in the petrochemical charactersof the world's basalts. There are no distinct types of basalt magma but rathera continuous series from silica saturated (tholeiitic) to silica-undersaturated(olivine-basalt) rock, although the chemical distinction may be too subtle to beread directly from chemical analyses. Ⅳ. ORIGINAL Basalt Magma The original magma of eastern China basalt belongs to the olivine basaltmagma type. In this discussion it is assumed that the primary olivine basaltmagma is melted from a crust of peridotitic crystalline rock in the upper partof the sima layer. Olivine basalt magma may be modified by the gain of alimited amount of silica and some alkalies to produce a derived melt, whichappears to coincide with the tholeiitic

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Except for earthquakes occurred in Taiwan and Himalayan region as well as the deep-seated swarm earthquakes in Northeast China, all of earthquakes in China are attributed to intraplate earthquake. Then, what are their origins?In the present paper, the emphasis is placed on the crustal stress field related closely with the earthquakes in recent and the youngest geological time in China. Data from geology, seismology, and geodesy demonstrate that in North China there is a significant change of stress field in...

Except for earthquakes occurred in Taiwan and Himalayan region as well as the deep-seated swarm earthquakes in Northeast China, all of earthquakes in China are attributed to intraplate earthquake. Then, what are their origins?In the present paper, the emphasis is placed on the crustal stress field related closely with the earthquakes in recent and the youngest geological time in China. Data from geology, seismology, and geodesy demonstrate that in North China there is a significant change of stress field in middle Tertiary, while in the rest areas of China the crustal stress field remains principally unchanged since middle Mesozoic. It is suggested that the pattern and variation of the crustal stress field in China are caused by the action of plates surrounding the mainland of China.However, intraplate earthquakes in China are not only connected with the plate tectonics, they also depend upon the remarkable features of fault block tectonics in the mainland of China. It is noted that some deep geological features found in the seismic areas are a very important clue for studying the origins of intraplate earthquake.

根据地质学、地震学和地形测量的资料认为:华北地区第三纪中期地壳应力场有一次重大变化,而中国其它地区自中生代中期以来地壳应力场基本未变。我国地壳应力场的这种布局及其变化看来是起因于中国大陆周围的板块活动。 讨论了我国板内地震和断块构造的关系。指出了值得加强研究的地震区域的某些深部地质现象。

The strain energy of the late maximum near and far earthquake events associated with great earthquakes of magnitude over Ms = 7.3 occurred on the mainland of China depends on the following factors, namely,(1) The strain energy of the main shock.(2) The strain energy of the near maximum shock occurred on the same day as the main shock.(3) The strain energy of the near maximum shock occurred within 15 days after the main shock.The formulas (9) and (10) give the expressions for actual quantitative calculation....

The strain energy of the late maximum near and far earthquake events associated with great earthquakes of magnitude over Ms = 7.3 occurred on the mainland of China depends on the following factors, namely,(1) The strain energy of the main shock.(2) The strain energy of the near maximum shock occurred on the same day as the main shock.(3) The strain energy of the near maximum shock occurred within 15 days after the main shock.The formulas (9) and (10) give the expressions for actual quantitative calculation.

在我国大陆 Ms=7.3以上的大地震所牵联的晚期最大近震和远震的应变能量依赖于如下诸因素:1、主震的应变能量;2、主震后当天最大近震的应变能量;3、主震后15天内最大近震的应变能量和发震时间.文中公式(9)和(10)则具体给出了定量的表示式.

 
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