中国地球物理学会(1990)年会

中国地球物理学会1990年年会于10月13—17日在武汉召开,参加会议的有来自全国130多个单位的607名代表。这是中国地球物理学会自1947年成立以来,规模最大的一次综合性会议。中国地球物理学会常务副理事长夏国治、副理事长曾融生、湖北省地球物理学会理事长     

岩性探测技术研讨会会讯

中国地球物理学会与山东省石油学会于1986年9月16日至18日在济南市召开了岩性探测(Petro-Sonde)技术研讨会,到会的有全国有关的11个部门32个单位的50名代表,会议由中国地球物理学会常务理事陆邦干同志主持。     

中国地球物理学会(1990)年会

中国地球物理学会1990年会于10月13日到17日在武汉召开,参加会议的代表有来自全国130个单位607人,这是中国地球物理学会自1947年成立以来,规模最大的一次综合性会议。中国地球物理学会常务副理事长夏国治、副理事长曾融生、湖北省地球物理学会理事长许厚泽主持了会议,湖北省、武汉市领导对会议十分关心并到会祝贺。 会上,夏国治副理事长向大会作了《当前工作和今后任务》的报告,曲克信秘书长作了     

中国地球物理学会1989年综合学术讨论会

为了促进地球物理各分支学科之间的相互渗透和交流,中国地球物理学会于1989年10月9日到10月14日在安徽合肥中国科学技术大学举行了1989年综合学术讨论会。会议由中国地球物理学会副理事长曾融生教授主持,来自全国104个单位的325名代表参加了会议,这是我国地球物理界近年来一次较大型的综合性学术会议。     

中国地球物理学会成立《地球物理学报》创刊40周年学术报告会——纪念学会、学报40周年

1988年7月21日,中国地球物理学会在北京科学会堂举行学术报告会,以纪念中国地球物理学会成立40周年、《地球物理学报》创刊40周年。200多名地球物理科技工作者冒着滂沱大雨参加了大会。 中国地球物理学会是我国较早成立的学会之一,在国内外有较高的声誉。在40年前成立时,只不过是一个志同道合的地球物理工作者联谊会,唯一的工作是出版《地球物理学报》,那时正是气象研究     

中国地球物理学会、中国地震学会联合学术大会纪要（中国地球物理学会第26届学术年会、中国地震学会第13次学术大会）

1会议概况 由中国地球物理学会、中国地震学会首次联合举办的学术大会（中国地球物理学会第26届学术年会、中国地震学会第13次学术大会）于2010年10月17日至20日在浙江省宁波市召开。     

中国地球物理学会第22届年会纪要

中国地球物理学会第22届年会于2006年10月15日至19日在四川省成都市召开.实际与会人员524人.10月15日上午在成都理工大学举行了大会开幕式.中国地球物理学会副理事长张永刚主持会议,理事长王水致开幕词,他指出年会是每年地球物理学会的重头戏,希望本届年会在搭建学术交流平台、     

第六届重力学与固体潮及重力仪器学术讨论会在无锡召开

中国地球物理学会第六届重力学与固体潮及重力仪器学术讨论会于1992年9月22—25日在无锡召开. 江苏省地震局和江苏地球物理学会受中国地球物理学会的委托,在重力学和固体潮专业组的指导下     

中国地球物理学会第24届年会纪要

中国地球物理学会第24届年会于2008年10月17日至21日在北京太阳城召开.注册与会人员466人,实际参加人数510人.10月17日上午在北京太阳城度假村举行了大会开幕式.中国地球物理学会副理事长张永刚主持会议,理事长王水致开幕词,他指出年会是每年地球物理学会的重头戏,希望本届年会     

桩基无损检测学术会议

中国地球物理学会和中国建筑学会于1988年9月23日—27日在沧州联合召开了桩基无损检测学术会议,参加会议的有126个单位的157名代表。中国地球物理学会秘书长曲克信同志参加了会议并讲了话。会议收到论文摘要72篇,在会上宣读了50余篇。     

The crystal structure of (Fe<Subscript>4</Subscript>Cr<Subscript>4</Subscript>Ni)<Subscript>9</Subscript>C<Subscript>4</Subscript>

(Fe4Cr4Ni)9C4 is a metal carbide mineral formed by combination of Fe, Cr and Ni with C. It occurs in a chromite deposit in the Luobusha ophiolite, Tibet. Based on the determination of its crystal structure, the empirical formula is (Fe4.12Cr3.84Ni0.96)8.92C3.70 and the simplified formula is (Fe4Cr4Ni)4C9. The mineral is hexagonal with a = 1.38392(2) nm, c = 0.44690(9) nm, pace group P63 m c, Z=6 and the calculated specific gravity Dx = 7.089 g/cm3. Fe, Cr and Ni occupy different crystallographic sites and their coordination numbers are approximately 12, forming an alternate stacking sequence of flat and puckered layers along the c axis. Some metallic atoms have a defect structure. The interatomic distances of Fe, Cr and Ni are 0.2525-0.2666 nm, and the distances between Fe, Cr, Ni and C are 0.1893-0.2169 nm. The coordination number of carbon is 6. It occurs in interstices of the metallic atoms Fe, Cr and Ni to form trigonalprismatically coordinated polyhedra. These coordination polyhedra are linked with each other via shared corners or shared edges into a new type of metal carbide structure.     

<Superscript>40</Superscript>Ar/<Superscript>39</Superscript>Ar ages of the<Emphasis Type="Italic"> AD</Emphasis> 79 eruption of Vesuvius,Italy

The Italian volcano, Vesuvius, erupted explosively in AD 79. Sanidine from pumice collected at Casti Amanti in Pompeii and Villa Poppea in Oplontis yielded a weighted-mean ⁴⁰Ar/³⁹Ar age of 1925±66 years in 2004 (1σ uncertainty) from incremental-heating experiments of eight aliquants of sanidine. This is the calendar age of the eruption. Our results together with the work of Renne et al. (1997) and Renne and Min (1998) demonstrate the validity of the ⁴⁰Ar/³⁹Ar method to reconstruct the recent eruptive history of young, active volcanoes.     

<Emphasis Type="Italic">Q</Emphasis><Subscript>c</Subscript> and <Emphasis Type="Italic">Q</Emphasis><Subscript>S</Subscript> wave attenuation of South African earthquakes

Quality factor Q, which describes the attenuation of seismic waves with distance, was determined for South Africa using data recorded by the South African National Seismograph Network. Because of an objective paucity of seismicity in South Africa and modernisation of the seismograph network only in 2007, I carried out a coda wave decay analysis on only 13 tectonic earthquakes and 7 mine-related events for the magnitude range 3.6?≤?M _L ?≤?4.4. Up to five seismograph stations were utilised to determine Q _c for frequencies at 2, 4, 8 and 16 Hz resulting in 84 individual measurements. The constants Q ₀ and α were determined for the attenuation relation Q _c(f)?=?Q ₀ f ^α . The result was Q ₀?=?396?±?29 and α?=?0.72?±?0.04 for a lapse time of 1.9*(t _s???t ₀) (time from origin time t ₀ to the start of coda analysis window is 1.9 times the S-travel time, t _s) and a coda window length of 80 s. This lapse time and coda window length were found to fit the most individual frequencies for a signal-to-noise ratio of at least 3 and a minimum absolute correlation coefficient for the envelope of 0.5. For a positive correlation coefficient, the envelope amplitude increases with time and Q _c was not calculated. The derived Q _c was verified using the spectral ratio method on a smaller data set consisting of nine earthquakes and one mine-related event recorded by up to four seismograph stations. Since the spectral ratio method requires absolute amplitudes in its calculations, site response tests were performed to select four appropriate stations without soil amplification and/or signal distortion. The result obtained for Q _S was Q ₀?=?391?±?130 and α?=?0.60?±?0.16, which agrees well with the coda Q _c result.     

First <Superscript>13</Superscript>C/<Superscript>12</Superscript>C isotopic characterisation of volcanic plume CO<Subscript>2</Subscript>

We describe analytical details and uncertainty evaluation of a simple technique for the measurement of the carbon isotopic composition of CO₂ in volcanic plumes. Data collected at Solfatara and Vulcano, where plumes are fed by fumaroles which are accessible for direct sampling, were first used to validate the technique. For both volcanoes, the plume-derived carbon isotopic compositions are in good agreement with the fumarolic compositions, thus providing confidence on the method, and allowing its application at volcanoes where the volcanic component is inaccessible to direct sampling. As a notable example, we applied the same method to Mount Etna where we derived a δ¹³C of volcanic CO₂ between −0.9 ± 0.27‰ and −1.41 ± 0.27‰ (Bocca Nuova and Voragine craters). The comparison of our measurements to data reported in previous work highlights a temporal trend of systematic increase of δ¹³C values of Etna CO₂ from ~ −4‰, in the 1970’s and the 1980’s, to ~ −1‰ at the present time (2009). This shift toward more positive δ¹³C values matches a concurrent change in magma composition and an increase in the eruption frequency and energy. We discuss such variations in terms of two possible processes: magma carbonate assimilation and carbon isotopic fractionation due to magma degassing along the Etna plumbing system. Finally, our results highlight potential of systematic measurements of the carbon isotopic composition of the CO₂ emitted by volcanic plumes for a better understanding of volcanic processes and for improved surveillance of volcanic activity.     

保角映射在換算重磁观测資料中的某些应用

本文利用保角映射方法对两种二维地形作了推导:一种是半圆弧形的边界,另一种是拋物线形的边界。并作了一些数值计算。     

MAGNÉTOMÈTRE DIFFÉRENTIEL À HAUTE SENSIBILITÉ*

The aim of this article is to describe the double resonance magnetometer system designed and built by the Division de Magnétométrie of the C.E.N. Grenoble, and used by the Département des Recherches Minières du CE.A. For the measurement of magnetic anomalies of geological origin it is necessary to make differential measurements between a mobile instrument which scans the region of interest and a fixed compensatory instrument. The apparatus described here features the following main characteristics: — it gives a direct numerical measurement of the differential magnetic field between the two instruments with an accuracy of 0.01 gamma (10^-7 Oe). — it is designed to be easily operated in geological field work (light weight, low power, possibility to make continuous measurements along a given profile, the measuring signals being radio-linked there are no wires connecting the instruments). Firstly we describe the components of the magnetometer itself namely: double resonance magnetometer heads and differential numerical magnetometer. Secondly we describe the measuring technique.     

Gesetzmäßigkeiten des Sauerstoffaustausches zwischen Gewässer und Atmosphäre im Flußmündungsgebiet

Meteorological conditions, biochemical processes in water bodies and anthropogenic pressure of a region are the main factors to determine the atmosphere water-body gas exchange. Research on oxygen outflows in the Dnjepr estuary region has shown that though gas exchange with atmosphere permanently exists its intensity varies throughout a day, vegetation period, year. The process of evasion is the most active in the flood plain pools of the river. Oxygen exchange between the atmosphere and a river is to be determined with physical characteristics of water outflow and with the anthropogenic influence. Oxygen absorption from the atmosphere is dominating for the liman water area in spite of differences between its parts. The obtained results have shown that gas exchange between river estuary pools and the atmosphere is of great importance for the oxygen balance of these pools.