青藏地区大地水准面形态及其与构造动力学的关系   总被引：2，自引：1，他引：2       下载免费PDF全文

陆洋  许厚泽 《地球物理学报》1996,39(2):203-210

利用密合法求解青藏地区大地水准面模型，研究青藏地区大地水准面主要特征及其与该区内部构造和活动的相关性．表明青藏地区大地水准而异常与青藏高原隆起的形状极为相似，大地水准面整体负异常与下地幔相关，形状起伏与上地幔相对应，岩石层反映的大地水准而异常与青藏高原活动构造有较好的对应关系．  相似文献   

应用地理信息系统辅助山坡地潜在崩山灾害评估模式之建立   总被引：2，自引：0，他引：2  

朱子豪  齐士峥  杨乃夷  许秋玲 《国土资源遥感》2001,12(4):13-19,68

山坡地开发具有潜在的自然危险因子,人工开挖也会触动这些因子,因此,要做好土地管理工作,需从分析潜在崩山灾害类型以及开发区位两方面考虑。地形分析在工程、灾害评估等方面广为应用,本研究以张石角(1987)提出的“简确工程地质灾害调查与评估法”为依据,以山坡地丙种建地作为评估对象,利用地理信息系统所提供的空间分析及数据库功能,完成台湾省中、北部地区大范围的山坡地潜在灾害评估工作,其成果也将为政府部门所采用.  相似文献   

曾文水库保护带泰山滑坡之调查与治理   总被引：1，自引：0，他引：1  

许中立  李金来 《山地学报》2002,20(4):411-420

崩塌与滑坡灾害之治理，首重破坏诱因了了解与破坏机制之调查。再根据调查观测所得之资料与参数，着手进行设计适当之防治对策，方能得到良好的治理成效。泰山滑坡位于台湾南部极重要之曾文水库的保护带。其边坡由陆陆续续的崩陷而逐渐演变为坍滑，甚至造成交通中断受阻。调查发现本区为属浅层滑动，滑动区平面类似酒瓶状，主要原因为长期受到雨水之漫流与渗透软化的影响，加上蚀沟之切割淘刷作用，使得边坡容易失去支撑而滑动。经施以经济有效的蚀沟控制工程兴建多座潜坝，跌水与排水设施后，发现确定提高了边坡之稳定性，地区产业因而可以持续动作，是一次相当成功的治理案例模式，但由于施工便道之开 当，遂再度诱发部份边坡的坍滑，故尔后之维护管理工作极为重要。  相似文献   

海洋潮汐对重力潮汐观测的影响   总被引：11，自引：4，他引：11       下载免费PDF全文

许厚泽  陈振邦  杨怀冰 《地球物理学报》1982,25(2):120-129

本文论述了海潮对重力固体潮观测的影响,把整个褶积计算分为近洋区及远洋区两部分,其中近洋区采用格林函数进行数值积分的方法,远洋区则利用全球海潮潮高的球函数展开式。着重讨论了远洋区的实施方案,导出了必要的工作公式,并就加速远洋区级数收敛问题作了探讨。利用导得的公式,计算了M₂海洋潮波对中国境内重力观测的影响。  相似文献   

1966年邢台地震的烈度异常   总被引：2，自引：0，他引：2       下载免费PDF全文

姚振兴  陈培善  肖承邺  徐果明 《地球物理学报》1974,17(2):106-121

一、引言 1966年3月22日,河北省邢台地区东汪发生了7.2级地震,距震中80-100公里的井陉-获鹿地区,比距震中较近的栾城地区造成的地震破坏更为严重,烈度异常增高的地区如图1所示。井陉-获鹿地区的地震破坏情况,经仔细调查,有以下四个特点。  相似文献   

Selected Phase Relationships in the System Al-Mn-Fe-Si-O-H: A Model for Garnet Equilibria   总被引：1，自引：0，他引：1  

HSU  L. C. 《Journal of Petrology》1968,9(1):40-83

The bulk compositions 3FeO_x.Al₂O₃.3SiO₂ $ excess H₂O and 3MnO.Al₂O₃.3SiO₂$ excess H₂O were investigated employing conventional hydrothermaltechniques. Almandine and spessartine were synthesized and stabilityrelationships determined in terms of temperature, fluid pressure,and oxygen fugacity. Synthetic almandine has unit cell edge, a₀ = 11.528 0.001 index of refraction, N_D = 1.829 0.003. No systematic variationsof these values with respect to temperature, fluid pressure,and oxygen fugacity were observed. Spessartine, synthesizedat high temperatures, has average values of a₀ = 11.614 0.001 and N_D = 1.799 0.003. However, below about 600 C a₀ graduallyincreases to 11.635 0.001 and N_D decreases to 1.772 0.003with decreasing temperature, irrespective of fluid pressureand oxygen fugacity. These changes appear to reflect the productionof hydrospessartine below about 600 C. The stability of almandine strongly depends on the oxygen fugacity.It is stable up to the vicinity of oxygen fugacities definedby the fayalite–magnetite$quartz buffer; the low f_o2,range has not been determined, but lies at oxygen fugacitiesless than those defined by the ironquartz–fayalite buffer.The stability field of almandine$fluid is bounded by the followingP_fluid-T values. At low oxidation states, the low temperature hydrous assemblageof equivalent composition consists of quartz$iron chlorite ($magnetite)$fluidand the high temperature equivalent assemblage consists of fayalite$ironcordierite$hercynite₈₈$fluid. Where f_O2 approximates or is inexcess of that defined by the fayalite–magnetite$quartzbuffer the low temperature hydrous assemblages consist of quartz$ironchlorite$magnetite$fluid, iron chlorite$pyrophyllite$magnetite$fluid,magnetite$mullite$pyrophyllite$fluid, and hematite$mullite$pyrophyllite$fluid;the anhydrous equivalent assemblages consist of quartz$hercynite₈₈,$magnetite₈₈$fluid, quartz$mullite$magnetite$fluid, and quartz$mullite$hematite$fluid,both in order of increasing oxygen fugacity. The stability of spessartine, in contrast to that of almandine,is essentially independent of oxygen fugacity at least up tothat defined by the magnetite-hematite buffer. Spessartine isstable up to the highest temperature, 930 C, employed in thisinvestigation at P_fluid = 500 bars. However, it decomposes toa hydrous assemblage consisting of quartz$manganese chlorite$fluidat the following P_fluid-T values: 414 5 C and 3000 bars;405 5C and 2000 bars; 386 10 C and 1000 bars; 3645C and 500 bars. Garnets are rare constituents of igneous rocks; those whichdo occur are predominantly spessartine-rich, and are virtuallyconfined to felsic magmas. Garnets are absent from mafic igneousrocks because the thermal stability ranges of iron-rich membersare below the solidus. The near absence of almandine in contactmetamorphosed pelitic rocks may reflect a relatively high oxidationstate in the aureoles rather than inappropriate P-T conditions.It is argued that the compositions of pyralspite garnets inpelitic schists are subject to various physical and chemicalfactors, including f_O2. With appropriate provisions, the Mn/Feratios of garnet coexisting with chlorite and quartz might beused as a temperature indicator. The rarity of spessartine in igneous and metamorphic rocks apparentlystems from the departure of rock bulk composition from Mn-richvalues rather than from the absence of appropriate physicalconditions.  相似文献   

中国地壳运动观测网络基准站应变场变化的海潮负荷信号改正问题   总被引：1，自引：0，他引：1  

孙和平  周江存  许厚泽 《测绘学报》2002,31(3):222-227

利用最新的卫星测高全球Csr3.0模型，中国近海海潮数据和标准地球模型负荷格林函数，采用直接褶积积分方法研究中国地壳运动观测网络基准站应变固体潮观测的海潮负荷影响。计算25个台站8个主要潮波的负荷振幅和相位，讨论几个主要台站的负荷应变花和负荷应变随时间的变化特征。  相似文献   

Ion Probe Study of Silicate Inclusions from Colomera (ⅡE) Iron Meteorite: the Rare Earth Element Perspective     

HSU Weibiao 《《地质学报》英文版》2004,78(5)

Coupled with a petrographical study, I carried out an ion probe study of rare earth element microdistributions in mineral phases of silicate inclusions from the Colomera ⅡE iron meteorite. Most mineral grains have homogeneous REEs, but show considerable inter-grain variations by a factor of 2 to 100. The whole rock REE abundances for Colomera, estimated by combining REE data with modal abundances, are relatively LREE-enriched with REEs of -10'CI, which suggest that Colomera silicates were highly differentiated and might represent a low degree partial melt (-10%) of a chondritic source. REE geochemistry of Colomera silicate inclusions points to an origin that involves differentiation, dynamic mixing, remelting, reduction, recrystallization, and subsequent rapid cooling near the surface of a planetary body.  相似文献   

Surface deformation and gravity changes caused by dilatancy in a layered elastic-vis-coelastic half space   总被引：1，自引：0，他引：1  

王勇  许厚泽 《地震学报(英文版)》1997,10(4):501-506

Ｓｕｒｆａｃｅｄｅｆｏｒｍａｔｉｏｎａｎｄｇｒａｖｉｔｙｃｈａｎｇｅｓｃａｕｓｅｄｂｙｄｉｌａｔａｎｃｙｉｎａｌａｙｅｒｅｄｅｌａｓｔｉｃ┐ｖｉｓ┐ｃｏｅｌａｓｔｉｃｈａｌｆｓｐａｃｅＹＯＮＧＷＡＮＧ（王勇）ＨＯＵＴＳＥＨＳＵ（许厚泽）Ｉｎｓｔｉｔ...  相似文献   

The Triassic Formations of Kueichou     

TE-YOU HSU Geological Survey of China 《地质学报》1943,(Z2):122-129

正 Triassic fossils of Kueichou were made known nearly half a century ago~1. Subsequent investigators have from time to time brought back new materials, but they are in general more or less fragmentary in nature. Through successive trips  相似文献