Significant resistivity changes in the fault zone associated with the 1999 Chi-Chi earthquake, west-central Taiwan     

Chieh-Hou Yang  Ping-Hu Cheng  Jiunn-I You  Louis L. Tsai 《Tectonophysics》2002,350(4):299-313

The purpose of this paper is to demonstrate the possible influence of an earthquake on the resistivity distribution in a fault zone. We collected resistivity image profiles across a proposed fault trace prior to the 7.3 magnitude 1999 shallow earthquake in the Chi-Chi area of Taiwan. Significant positive resistivity anomalies were observed in the hanging wall after the earthquake. However, there were negligible resistivity changes in the footwall. From an examination of geoelectric phenomena and surface rupture in the fault zone, it is believed that geoelectric anomalies are associated with abrupt displacement along the active Chelungpu fault. This result indicates a potential for resistivity methods to provide a basis for the monitoring of an active fault.  相似文献   

A parametric model of vertical eddy fluxes in the atmosphere   总被引：42，自引：2，他引：42  

Jean-François Louis 《Boundary-Layer Meteorology》1979,17(2):187-202

A scheme for the representation of the vertical eddy fluxes of heat, momentum and water vapour in a forecast model is presented. An important feature of the scheme is the dependence of the diffusion coefficients on the static stability of the atmosphere. Two tests are presented, using the scheme in a one-dimensional model: the simulation of the diurnal cycle, and the transformation of a polar air mass moving over the warm sea.  相似文献   

Ice lens structures, compression strengths and creep behavior of some synthetic frozen silty soils     

Frederick J. Radd  Louis H. Wolfe 《Engineering Geology》1979,13(1-4):169-183

This research paper concerns the frozen state properties of several silty soils encountered in the construction of a large LNG storage cavern near Carlstadt, New Jersey.

The creep and compression strengths were correlated with both field and laboratory-measured mechanical properties. These cryogenic mechanical properties were related to ice lens structures, sizes and occurrences, and to heat flow and geological structure effects. Three distinct and separate types of ice lenses were identified. These cryogenic ground data pertain to the prediction of the engineering properties of frozen earth for large structures. Sample size effect problems were investigated, this in relationship to the number and size and orientations of the ice lenses present.  相似文献   

Uranium and microcracks in a 1,000-meter core,Redstone, New Hampshire     

Louis Caruso  Gene Simmons 《Contributions to Mineralogy and Petrology》1985,90(1):1-17

The spatial distribution and mineralogical association of uranium in 30 samples of a 1,000 meter core from the Redstone (NH) Quarry were examined with fission track techniques, backscattered electron imaging, and energy dispersive X-ray spectrometry with the following results for the Conway and Mount Osceola granites: (1) Uranium occurs in microcracks sealed with siderite and/or with Ca+ RE fluorocarbonate minerals; the uranium contents of siderite and the RE fluorocarbonates are 1 to 30 ppm and 500–1,500 ppm, respectively. (2) Siderite and to a lesser extent RE fluorocarbonate minerals occur as replacement minerals of amphibole and biotite; the RE fluorocarbonates are the main alteration minerals of allanite. (3) The degree of alteration and the extent of uranium redistribution are greater in samples with major uraniferous microcracks. (4) The contents of Ca and Mn are approximately constant for siderite in sealed cracks throughout the Conway and Mount Osceola granites for the entire section penetrated by the corehole, approximately 700 meters. — From these observations, we conclude that an extensive set of fractures throughout a significant volume of the Mount Osceola and Conway granties were the conduits through which hydrothermal fluids containing CO₂, uranium, and REs circulated. Microcracks facilitated fluid-rock interactions resulting in alteration and uranium redistribution. Certain primary uraniferous accessory minerals, i.e., allanite and ilmenorutile may have been the source for at least part of the uranium and REs that now occur in secondary minerals in these granites.  相似文献   

    

M. Louis 《Journal of Geodesy》1975,49(1):110-111

Sans résumé

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“Astronomy of star positions:A critical investigation of star catalogues, the methods of their construction and their purpose” by Heinrich Eichhorn 1 volume. 357 pages, 25 U.S. $, publié par Frederick Ungar Publishing C^o, Inc., 250 Park Avenue South, New York, N.Y. 10003

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Edge waves over an exponential continental shelf in a uniformly rotating ocean     

Dr. D. J. Clarke  J. P. Louis 《Ocean Dynamics》1975,28(4):168-179

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Toxicological and physiological responses of the fish,Leiostomus xanthurus,exposed to chlorine produced oxidants     

Douglas P. Middaugh  Louis E. Burnett  John A. Couch 《Estuaries and Coasts》1980,3(2):132-141

The sublethal and lethal effects of chlorine produced oxidants (CPO) on juveniles of the estuarine teleost,Leiostomus xanthurus, were investigated in flowing water tests conducted at 30 ±1°C and 26 to 31‰ salinity. Short-term LT50 tests were conducted at two nominal concentrations of NaOCl, 1.0 and 1.4 mg/l (respective measured CPO concentrations 0.09 and 0.12 mg/l) which were sublethal in 2,880 minute exposures; and three nominal concentrations, 1.6, 1.8 and 3.2 mg/l NaOCl (respective measured CPO concentrations 0.13, 0.20 and 0.37 mg/l) which were acutely toxic. Opercular ventilation rates in exposed spot were much higher than in control fish, but returned to rates only slightly above those of controls during the latter portion of the 2,880 minute exposure to the two sublethal CPO concentrations. Opercular rates at the three acutely toxic CPO concentrations remained much higher than control rates until the exposed fish died. Blood pH after 2,880 minutes of exposure to the sublethal concentrations of CPO; or at the respective estimated LT50 for lethal concentrations, showed significant decreases ( \(\bar X\) as low as 6.84) compared to controls \((\bar X 7.35)\) . No significant changes in the % methemoglobin were observed. Oxygen uptake by spot was depressed at all of the measured concentrations of CPO tested. Histopathological examination showed that gill respiratory epithelial tissues sloughed away from the underlying pillar cells. Complete denudation of circulatory tissues and hemangiectic secondary lamellae were observed in gill tissues from fish exposed to the highest CPO concentration of 0.37 mg/l.  相似文献   

Lateglacial and Holocene climate oscillations in the South-western Alps: An attempt at quantitative reconstruction     

Elena Ortu  Odile Peyron  Amandine Bordon  Jacques Louis de Beaulieu  Consolata Siniscalco  Rosanna Caramiello 《Quaternary International》2008,190(1):71

The high topographic complexity of the Alpine region is the origin of important climate differences that characterise the different areas of the Alps. These differences might have had a strong influence on vegetation and on migrations of human populations in the past. Based on an improved database containing about 3000 modern pollen samples, the standard “Modern Analogue Technique” has been applied to five pollen sequences from the subalpine belt of the South-western Italian Alps (Laghi dell’Orgials, 2240 m, Lago delle Fate, 2130 m, Torbiera del Biecai, 1920 m, Rifugio Mondovì, 1760 m, Pian Marchisio, 1624 m) to provide quantitative climate estimates for the Lateglacial and Holocene periods. Consistent climate trends are reconstructed for the different sequences. Sites recorded in detail the climate variations when they were located at the limit of two ecotones. Sites above the tree line recorded lower temperature values and less important variations. Climate was cold and dry during the Oldest and Younger Dryas and close to present-day values during the Bølling/Allerød interstadial. At the beginning of the Holocene, climate changed to warmer and moister conditions; a high number of climate fluctuations are recorded at several sites. A climate optimum is recorded in the Atlantic period, which caused a development of fir above its present-day altitudinal distribution. Climatic differences recorded at the various sites are discussed taking into account the limits of the method.  相似文献   

FLORIDA'S SEAWARD BOUNDARY: A PROBLEM IN APPLIED HISTORICAL GEOGRAPHY*     

Louis De Vorsey 《The Professional geographer》1973,25(3):214-220

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Impact of methane seeps on the local carbon‐isotope record: a case study from a Late Jurassic hemipelagic section     

Beat Louis‐Schmid  Pauline Rais  Dmitry Logvinovich  Stefano M. Bernasconi  Helmut Weissert 《地学学报》2007,19(4):259-265

An Oxfordian (Late Jurassic) hemipelagic succession from Beauvoisin (SE France) contains a pronounced, short‐lived negative excursion in the bulk‐carbonate carbon‐isotope record, with an amplitude of 4‰. It was shown previously that the Beauvoisin paleoenvironment was impacted by hydrocarbon seepage. New isotopic data corroborate that methane was a significant constituent of these hydrocarbons. The negative excursion was caused by transient enhanced precipitation of ¹³C‐depleted carbonate, mediated by anaerobic oxidation of methane. Despite its local diagenetic origin, the Beauvoisin excursion is similar in shape and duration to globally recognized negative C‐isotope excursions that have been related to catastrophic, massive dissociation of methane hydrate. Shape and duration of negative excursions therefore cannot be used as an argument when determining their origin if they have not been shown to represent a global perturbation of the carbon cycle.  相似文献