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1.
本文根据地震历史资料和实地考察记录,详述了这次地震的震害分布特征,圈定出九、八、七各烈度区的范围,重新测定了宏观地震参数(震中位置;北纬29°41′,东径108°45′;震中烈度;九度;震源深度:8公里左右;震级:6.4;震源破裂:长20余公里,走向北西310°—345°,倾向北东,倾角约60°,左旋水平位移,向北北西仰起,朝南东倾伏)。对其构造特征分析认为:北东30°—40°延伸的黄金洞断裂和黔江断裂为控震构造,北西310°—345°的破裂带则起着发震构造的作用。 相似文献
2.
根据点源孕震力学模型 ,应用福建 台湾地区GPS位移速度资料反演 1999年台湾南投Mw7.6大震前的孕震参数。反演所得的震中与实际发生的地震震中相差 6 7km ,主压应力场方向为 319.9°,倾角 - 2 8.6° ,即仰角2 8.6° ,与用震源机制解得到的P轴方向和倾角分别相差 17°和 8.6° ,与菲律宾板块向亚洲板块挤压的方向是一致的。用土耳其地区GPS位移速率资料反演 1999年土耳其Mw7.6地震前的孕震参数 ,反演得到的震中与实际震中相差 70km ,主应力方位角和倾角分别为 16 2 .5°、11.5°,与震源机制解结果分别差 2 4 .5°和 1.5°。 相似文献
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山东山旺国家地质公园位于临朐县城东约22km的解家河、包家河一带,以山旺古生物化石国家级自然保护区为主体,其范围北至灵山,东至潘家庄,南至黄山、菜园,西至东周家庄、清泉沟一带。地理坐标为东经118°42′00″~118°44′00″,北纬36°32′15″~36°34′30″,面积约13km2。公园内地形起伏较大,属低山丘陵,最高峰尧山海拔405.5m。地表水系有解家河等,属弥河水系,为季节性河流。该区属北温带季风气候,年均气温12.4°C,年均降雨709mm。青岛-泰安二级公路从公园园区中部通过。1980年1月,国务院将山旺化石产地列为国家重点自然保护区;1981年设… 相似文献
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王新吾 《大地测量与地球动力学》1987,(2)
渭河盆地中部(东经108°40′—109°10′,北纬34°00′—34°43′)的垂直形变,特别是西安市的地面沉降及其成因,近年来引起人们的普遍关注,并提出种种不同的看法1)2)[1][2]。笔者认为,仅用西安城区小范围的地形变资料讨论西安市的地面沉降,似乎存在局限性。渭 相似文献
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Distributions of inorganic nutrients in the bohai sea of china 总被引：2，自引：0，他引：2
LI Zhengyan * BAI Jie SHI Jinhui GAO Huiwang College of Environmental Science Engineering Ocean University of China Qingdao P..R.China 《中国海洋大学学报(英文版)》2003,2(1):112-116
1 Introduction TheBohaiSeaislocatedinthenorthernChinawithlongitudesofbetween 117°38′Eand 12 2°31′Eandlat itudesofbetween 37°0 8′Nand 4 1°0 2′N .Itisashal lowseawithanaveragewaterdepthof 18m (LiuandZhang ,2 0 0 0 ) .Severalbigrivers ,suchastheLiaoheRiver,theHaiheRiverandtheYellowRiver ,findtheirwaysintotheBohaiSeaandtransportlargeamountofnutrientsandsuspendedmattersfromthecontinentintothesea (Zhangetal.,1994 ;Zhang ,1996 ) .Duringthelasttwodecades ,marineenviron mentintheBohai… 相似文献
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曲江断裂及其周边地区现今地壳垂直形变特征 总被引：1，自引：0，他引：1
曲江断裂及其周边地区 195 5～ 1973年的水准测量资料的处理分析结果显示 :1970年 1月 5日通海 7.7级大地震 (震中 :2 4°0 1′N ,10 2°4 3′E)前 ,沿曲江断裂形成半径达 4 5km的大面积下沉区 ,下沉中心的下降速率每年近 2 0mm。与檀原毅 196 6年提出震级与地壳形变半径的经验关系式M =1.96lgr+ 4 .4 5有较好的符合关系 ,表明这种大面积下沉是通海大地震的一种典型的垂直形变异常现象。 1986年以来昆明市的水准观测资料显示 :官渡 呈贡一带存在一个半径约 5km的下沉区 ,近几年来下沉中心下降有加速现象 (下降速率每年达 30mm) ,该下沉区也正好位于黑龙潭 官渡断裂与富民 呈贡断裂隐伏段的交汇部位 ,按震级与地壳形变半径经验关系式推算 ,该下沉区附近未来最大地震震级应为 6级左右 相似文献
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Tang Guo＇an Ge Shanshan Li Fayuan Zhou Jieyu 《山地科学学报》2005,2(3):265-270
Introduction The Loess Plateau is located in the upper and middle reaches of the Yellow River, among the western Taihang Mt, eastern Riyue-Helan Mt, northern Qinling Mt, and southern Yinsan Mt (from 100°54′to 114°33′E and 33°43′to 41°31′N; Figure 1). It covers a total area of 624,000 km2. The Loess Plateau of China has drawnworldwide attention in geographical research for its unique morphological features, abundant nature resources, most serious soil erosion, as well as its pot… 相似文献
8.
何蒙福 《大地测量与地球动力学》1988,(4)
根据地震波速结构提供的地壳模型,本文选择了△g布—△(?)_(20′× 20′)和△(?)_(30′×30′)—△(?)_(1°×1°)两个深度层的剩余布格异常,从纵、横向变化特征探讨了它们的地质构造意义,对壳内深部构造分区作了划分。提出了研究区域内存在“安康—南漳北西西向深部构造带”和“保康—宜都近南北向深部构造带”,并赋以中强震地震带涵义,推测是深达“硅镁层”内的“壳内断裂带”。并从震源深度变化与地震震中分布介述了异常与地震的相依性,指出地壳内波浪形构造的斜坡往往是剩余布格异常变化特征带、区,是发生地震的主要构造部位。 相似文献
9.
用卫星测高和船测重力资料联合反演海洋重力异常 总被引：2，自引：1，他引：1
基于多颗卫星最新测高资料联合解算的全球平均海平面和中国近海船测重力异常数据,采用3种方法 (Stokes公式逆运算法、垂线偏差法、最小二乘配置法)分别计算了中国近海及其邻域(0°～40°N,105°～145°E)2′× 2′重力异常,重点对3种方法的优缺点及其计算结果进行了比较和分析。结果表明,在海底地形起伏较为强烈的南 海盆地,与船测重力异常比较,最小二乘配置法(LSC)计算精度较高,达到11.2×10-5ms-2。 相似文献
10.
张北地震前地壳形变异常及力学分析 总被引：2，自引：2，他引：0
1998年 1月河北省张北 6 .2级地震前 ,在震中区西部存在一个幅度为 2 0mm的隆起异常区 ,震后异常恢复。根据张北地区 1984～ 1991年的水准测量资料 ,反演地震孕育期间的力学参数 ,结果显示震源区受力增加了32× 10 14 N ;力系中心位置为 4 0 .99°N ,113.99°E ,力系的方位角α =2 8.6 5°,力系的倾角 β =- 17.19° ,与后来实际发生地震的震中及震源机制十分接近 ,与华北地区区域应力场也基本一致。理论形变图与实测图大体相似。 相似文献
11.
杨继祥 《地球科学与环境学报》1990,(4)
文章对公元1022年大同云、应二州6.5级地震及其地质背景进行了考证。笔者认为,此次地震的震中位于黄花梁南缘构造复杂部位,即北纬39°32′,东经113°00′附近,其极震区包括现大同、应县、怀仁和山阴县等广大地区;这次地震是山西强震带内的一次历史强震,是在统一的华北区域构造应力场控制下发生的。考证这次地震的震情和地质背景,对研究大同盆地地区地震发生规律和特点以及对未来地震的预测和预报,具有重要的实际意义。 相似文献
12.
DISTRIBUTIONS OF CHEMICAL ELEMENTS WITH RELATION TO MAJOR WATER CIRCULATIONS IN THE CENTRAL AND NORTHERN PARTS OF THE TAIWAN STRAIT 总被引：4，自引：0，他引：4
Data obtained from a comprehensive multidisciplinary oceanographic survey in the central and northern parts of the Taiwan Strait, 24°20′-26°00′N, 118°45°-121°00′E by the Fujian Institute of Oceanology during the period May, 1983 through May, 1984, showed that the distributions of dissolved oxygen (DO), nitrate, dissolved inorganic phosphate and silicate concentrations here had obvious areal and seasonal characteristics that were mainly influenced by the seasonal circulation ofthree major water systems in the Taiwan Strait-- the Taiwan Strait Warm Water (TSWW), theZhejiang-Fujian Coastal Water (ZFCW), and the Northeastern Strait Warm Water (NESWW). 相似文献
13.
Three new spades and a new variety of nannoplankton, Chrysochromulina papillata, Gaysochromulina chiton var. minuta, Paraphysomonas simplexocorbita and Paraphysomonas bisorbulina are reported in this paper. All were isolated from the preliminary culture samples of seawater collected from Jiaozhou Bay, Shandong, China. The three species occurred at Station 1(120° 14.56′ E, 36°4′N) in November 1984, the new variety at Station 2 (120° 16.35° E,36°4.5′N) in January, 1985. The morphological features, especially the structures of the scales of these new nannoplankton,. are described. The differences between the new species and the related ones are discussed; their movement and nutrition, and the temperature and salinity of their biotopes are also mentioned. 相似文献
14.
Phytoplankton Community Dynamics in West Lake After Drawing Water from the Qiantang River 总被引：2，自引：0，他引：2
1INTRODUCTIONTheWestLake ( 30°1 5′N ,1 2 0°1 6′E)isasmallshallowlakeinthewesternpartofHangzhouCityinthesoutheasterncoastalareaofChina.Thelakeissur roundedonthreesidesbyhills ;andisfamousforitspicturesquesceneryandinterfusionofhillsandwaterbodies.Thesurfaceareaisabout 5 .66km2 andmeandepthis 1 .8m .Beforethe 1 95 0s ,thelakewaterwascleanandmacrophytesgrewveryluxuriantlyinthelit toralareasofthelake .In 1 95 2 ,WestLakewasdredgedand 70 0× 1 0 4m3 mudwasremovedfromthebottomofthelake … 相似文献
15.
It is beyond expectation that several fruiting heads and other parts of the plants of Compositae, preserved mainly in fossil impressions, are also recognized in the Middle Jurassic flora collected from Yanliao region(Lat. 40°58′N, Long. 120°21′E)of North China. Fruiting heads small, subspheroidal, generally about 10mm or less in diametre, each enclosed by an involucre consisting of several layers of bracts. Receptacles largely short columnar, attached on the base of involucral bracts. In few heads cypselas(achenes)arranged slightly compact in a 相似文献
16.
Two cruises were conducted in January and July 1986 in the Changjiang (Yangtse River) Estuary and its adjacent East China Sea (30°45′ -32°00′N,121°00′-124°00′E). Direct epifluorescence counts of planktonic bacteria and determinations of ATP concentrations were made. Subsamples were taken for measurement of oxygen consumption rates and chlorophyll concentrations.Bacteria and ATP concentrations were higher in summer than in winter, highest in the river and the river mouth, and gradually lower offshore. The bacteria number was correlated positively with suspended matter, nitrates and oxygen consumption rates, and negatively with salinity.In winter bacteria were the main contributors of ATP and the main consumers of dissolved oxygen in the whole studied area. In summer two maxima of ATP were found along the salinity gradient. The first one which coincided with the peak of turbidity near the river mouth was attributed to bacte -ria, and the second which occurred in the waters with a salinity range be 相似文献
17.
In 1981 a magnetic and bathymetric survey was carried out over Explorer Seamount located approximately between 48°50′ and 49°30′N and 130°40′ and 131°30′W. During the cruise four pillow fragments were dredged from peaks in this area. Based on the observed magnetic.data, it was identified that the main peak of Explorer Seamount should be of the Bruhnes age while the magnetic high in the N W of study area would be Gauss. This would yield a spreading rate of about 2 cm per year for the Matuyama epoch. The results of intensities of remanence measured from the pillow fragments indicate that the ages are less than 106 years. Similarly the Curie temperature is consistent with ages of around 106 years. An attempt was made to model the observed magnetic field using a series of uniformly magnetized NE-SW trending blocks of alternating polarity. Agreement between the model and observed results is satisfied. Oxidation ratios calculated from measured samples suggest that the main peak of Explorer Seamount is 相似文献
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１９９６年南黄海６．１级地震前的异常浅析郭爱香刁守中马玉香王红卫（山东省地震局，济南２５００１４）１９９６年１１月９日２１时５６分（北京时间），在南黄海勿南沙隆起区南部，绍兴－佘山岛断裂带北侧（３１°４２′Ｎ，１２３°０６′Ｅ）发生６．１级地震。此次... 相似文献