Assessing the Vibrational Frequencies of the Cathedral of Cologne (Germany) by Means of Ambient Seismic Noise Analysis   总被引：1，自引：0，他引：1  

Andreas Fäcke  Stefano Parolai  Sandra M. Richwalski  Lothar Stempniewski 《Natural Hazards》2006,38(1-2):229-236

Ambient seismic noise measurements were conducted inside the Cathedral of Cologne (Germany) for assessing its frequencies of vibration and for checking whether these occur in the range where soil amplification is expected. If this is the case, damages may increase in case of an earthquake due to an increased structural response of the building. Analysis of the ratio between the horizontal and vertical components of the spectra recorded at stations located inside the building as well as the ratio between the corresponding components of the spectra recorded simultaneously inside the building and at a reference station placed in the basement of the cathedral indicated several modes of vibration. Facilitated by these results an assessment of the seismic vulnerability was attempted for a 2D ground motion scenario using the finite element method.  相似文献   

Zum 80. Geburtstag von Hermann Heynig     

Dr.Lothar Tuscher 《Limnologica》2003,33(4):355-358

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The Triassic in Thailand     

Dr. Lothar Hahn 《International Journal of Earth Sciences》1982,71(3):1041-1056

The tectonic movements which occurred in Thailand between the Permian and the Jurassic (Indosinian Orogeny) caused the uplifting and subsidence of areas which were dominant paleogeographic features during the Triassic. The strong orogenic movements during the Norian caused an alteration of the paleogeographic conditions.The two sedimentation cycles of the Triassic comprised a marine facies development from the Skythian to the early Norian and a terrestrial one from the later Norian to the Rhaetian/Liassic.The development of the facies and structure of the Triassic sediments, as well as the intrusion and effusion of igneous rocks, are due to the subduction of oceanic crust beginning in the Carboniferous and to the collision of the Eurasian with the Indochina Plate during the Norian.

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Zusammenfassung Die zwischen Perm und Jura in Thailand auftretenden tektonischen Bewegungen (Indosinische Orogenese) führten zur Bildung von Hebungs- und Senkungsgebieten, die die Paläogeographie in der Trias beherrschten. Die starken orogenen Bewegungen im Nor führten zu einer Umgestaltung der paläogeographischen Verhältnisse.Die beiden während der Trias auftretenden Sedimentationszyklen bestehen aus einer marinen Faziesentwicklung vom Skyth bis zum unteren Nor und einer terrestrischen vom oberen Nor bis zum Rhät/Lias.Die fazielle und strukturelle Entwicklung der Triassedimente sowie die Intrusion bzw. Effusion von Eruptivgesteinen sind auf die seit dem Karbon erfolgende Subduktion ozeanischer Kruste und die Kollision der Eurasiatischen Platte mit der Indochinesischen Platte im Nor zurückzuführen.

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Résumé Les mouvements tectoniques («Orogenèse Indosinienne») intervenus entre le Permien et le Trias en Thaïlande se sont traduits en soulèvements et affaissements qui ont dominé la paléogéographie du Trias. Les forts mouvements orogéniques du Norien ont conduit à transformer les rapports paléogéographiques.Les deux cycles sédimentaires du Trias consistent dans le développement d'un faciès marin du Scythien au Norien inférieur, et d'un faciès continental du Norien supérieur au Rhétien/Lias. L'évolution du faciès et de la structure des sédiments du Trias, l'intrusion et l'effusion des roches ignées sont attribuées à la subduction de la croute océanique consécutive au Carbonifère, et à la collision de la «Plaque Euroasiatique» avec la «Plaque Indochinoise» au Norien.

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Die Entstehung von Knollenkalken in eu- und miogeosynklinalen Gebieten     

Dozent Dr. Lothar Greiling 《International Journal of Earth Sciences》1967,56(1):336-340

Zusammenfassung Kalkknollengesteine können in Eugeosynklinalen innerhalb von Rutschmassen, durch Beben, durch unterschiedliche Setzung und durch sedimentäre Boudinage entstehen. Daran gebunden sind syndiagenetische Zerbrechung und örtlich intensive syndiagenetische Faltung.Die mesozoischen Kalk-Mergel-Folgen der Miogeosynklinalen und der Innenbecken sind über weite Strecken dicht mit pseudonodules erfüllt. Die pseudonodules sind wahrscheinlich durch die Aufarbeitung einer älteren Schüttung durch eine jüngere Schüttung hervorgegangen. Vorausgesetzt wird ein unruhiges Relief infolge unterschiedlicher Setzung. Ein großer Teil der mesozoischen Kalke liegt auf zweiter Lagerstätte.

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Rocks containing limestone nodules may develop in eugeosynclines within slump masses, by earthquakes, differential compaction and boudin-shaped sedimentary accumulations. Syndiagenetic fracturing and strongly developed syndiagenetic folding are related to these structures.Pseudonodules are densely distributed throughout extensive areas of the mesozoic limestone-marl series within the miogeosynklines and the interior basins. They probably resulted from the reworking of an older sediment. An uneven relief, produced by differential compaction can be assumed. A large portion of the mesozoic limestone occurs within this reworked type of deposit.

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Résumé Il est possible que des calcaires noduleux se forment dans des eugéosynclines au milieu d'éboulements ou par des tremblements de terre ou par un tassement differencié ou bien par un boudinage sédimentaire. En relation avec ces phénomènes on trouve une tectonique syndiagénétique de style cassant et localement une tectonique syndiagénétique de plis intenses.Les successions calcaro-marneuses du Mésozoique des miogéosynclines ainsi que des bassins intérieurs contiennent bien des pseudonodules à longues distances. Il est probable que ces pseudonodules résultent de la reprise d'une ancienne par une nouvelle couche de sédimentation sous la condition d'un relief accentué à cause d'un tassement differencié. Une grande partie des calcaires mésozoiques se trouve maintenant en gîte secondaire.

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Variability and propagation of Labrador Sea Water in the southern subpolar North Atlantic     

Dagmar Kieke  Birgit Klein  Lothar Stramma  Monika Rhein  Klaus Peter Koltermann   《Deep Sea Research Part I: Oceanographic Research Papers》2009,56(10):1656-1674

The variability of two modes of Labrador Sea Water (LSW) (upper and deep Labrador Sea Water) and their respective spreading in the interior North Atlantic Ocean are investigated by means of repeated ship surveys carried out along the zonal WOCE line A2/AR19 located at 43–48°N (1993–2007) and along the GOOS line at about 48–51°N (1997–2002). Hydrographic section data are complemented by temperature, salinity, and velocity time series recorded by two moorings. They have been deployed at the western flank of the Mid-Atlantic Ridge (MAR) in the Newfoundland Basin during 1996–2004. The analysis of hydrographic anomalies at various longitudes points to a gradual eastward propagation of LSW-related signals, which happens on time scales of 3–6 years from the formation region towards the MAR. Interactions of the North Atlantic Current (NAC) with the Deep Western Boundary Current (DWBC) close to Flemish Cap point to the NAC being the main distributor of the different types of LSW into the interior of the Newfoundland Basin. Comparisons between the ship data and the mooring records revealed that the mooring sites are located in a region affected by highly variable flow. The mooring time series demonstrate an elevated level of variability with eddy activity and variability associated with the NAC considerably influencing the LSW signals in this region. Hydrographic data taken from Argo profiles from the vicinity of the mooring sites turned out to mimic quite well the temporal evolution captured by the moorings. There is some indication of occasional southward flow in the LSW layer near the MAR. If this can be considered as a hint to an interior LSW-route, it is at least of minor importance in comparison to the DWBC. It acts as an important supplier for the interior North Atlantic, distributing older and recently formed LSW modes southward along the MAR.  相似文献   

An overview of the ACE‐2 CLOUDYCOLUMN closure experiment     

J. L. Brenguier  P. Y. Chuang  Y. Fouquart  D. W. Johnson  F. Parol  Hanna Pawlowska  Jacques Pelon  Lothar Schüller  F. Schröder  J. Snider 《Tellus. Series B, Chemical and physical meteorology》2000,52(2):815-827

CLOUDYCOLUMN is one of the 6 ACE‐2 projects which took place in June‐July 1997, between Portugal and the Canary Islands. It was specifically dedicated to the study of changes of cloud radiative properties resulting from changes in the properties of those aerosols which act as cloud condensation nuclei. This process is also refered to as the aerosol indirect effect on climate. CLOUDYCOLUMN is focused on the contribution of stratocumulus clouds to that process. In addition to the basic aerosol measurements performed at the ground stations of the ACE‐2 project, 5 instrumented aircraft carried out in situ characterization of aerosol physical, chemical and nucleation properties and cloud dynamical and microphysical properties. Cloud radiative properties were also measured remotely with radiometers and a lidar. 11 case studies have been documented, from pure marine to significantly polluted air masses. The simultaneity of the measurements with the multi‐aircraft approach provides a unique data set for closure experiments on the aerosol indirect effect. In particular CLOUDYCOLUMN provided the 1st experimental evidence of the existence of the indirect effect in boundary layer clouds forming in polluted continental outbreacks. This paper describes the objectives of the project, the instrumental setup and the sampling strategy. Preliminary results published in additional papers are briefly summarized.  相似文献   

Assessing the Vibrational Frequencies of the Holweide Hospital in the City of Cologne (Germany) by Means of Ambient Seismic Noise Analysis and FE modelling     

Stefano?ParolaiEmail author  Andreas?F?cke  Sandra?M.?Richwalski  Lothar?Stempniwski 《Natural Hazards》2005,34(2):217-230

Ambient seismic noise measurements were conducted inside the Holweide Hospital (Cologne) for checking whether its frequencies of vibration fall into the range where soil amplification is expected. If this is the case, damage might increase in case of an earthquake due to an amplified structural response of the building. Two different techniques were used: the ratio between the horizontal and vertical components of the spectra recorded at stations located inside the building and the ratio between the corresponding components of the spectra recorded simultaneously inside the building and at a reference station placed outside. While the former method might be preferred because of less equipment involved, the latter has the advantage of producing more stable results and deleting automatically the influence of the sedimentary cover, which might obscure some eigenfrequencies of vibration of the building. An independently performed finite-element analysis of the hospital showed a good correlation between measured and calculated eigenmodes.  相似文献   

Quantifying sediment storage in a high alpine valley (Turtmanntal,Switzerland)     

Jan‐Christoph Otto  Lothar Schrott  Michel Jaboyedoff  Richard Dikau 《地球表面变化过程与地形》2009,34(13):1726-1742

The determination of sediment storage is a critical parameter in sediment budget analyses. But, in many sediment budget studies the quantification of magnitude and time‐scale of sediment storage is still the weakest part and often relies on crude estimations only, especially in large drainage basins (>100 km²). We present a new approach to storage quantification in a meso‐scale alpine catchment of the Swiss Alps (Turtmann Valley, 110 km²). The quantification of depositional volumes was performed by combining geophysical surveys and geographic information system (GIS) modelling techniques. Mean thickness values of each landform type calculated from these data was used to estimate the sediment volume in the hanging valleys and the trough slopes. Sediment volume of the remaining subsystems was determined by modelling an assumed parabolic bedrock surface using digital elevation model (DEM) data. A total sediment volume of 781·3×10⁶–1005·7×10⁶ m³ is deposited in the Turtmann Valley. Over 60% of this volume is stored in the 13 hanging valleys. Moraine landforms contain over 60% of the deposits in the hanging valleys followed by sediment stored on slopes (20%) and rock glaciers (15%). For the first time, a detailed quantification of different storage types was achieved in a catchment of this size. Sediment volumes have been used to calculate mean denudation rates for the different processes ranging from 0·1 to 2·6 mm/a based on a time span of 10 ka. As the quantification approach includes a number of assumptions and various sources of error the values given represent the order of magnitude of sediment storage that has to be expected in a catchment of this size. Copyright © 2009 John Wiley & Sons, Ltd.  相似文献   

Assessment of population size and migration routes of silver eel in the River Rhine based on a 2-year combined mark-recapture and telemetry study     

Breteler  Jan Klein; Vriese  Tim; Borcherding  Jost; Breukelaar  Andre; Jorgensen  Lothar; Staas  Stefan; de Laak  Gerard; Ingendahl  Detlev 《ICES Journal of Marine Science》2007,64(7):1450-1456

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Probing the Earth’s Interior with the LENA Detector     

Kathrin A. Hochmuth  Franz V. Feilitzsch  Teresa Marrodán Undagoitia  Lothar Oberauer  Walter Potzel  Michael Wurm  Brian D. Fields 《Earth, Moon, and Planets》2006,99(1-4):253-264

A future large-volume liquid scintillator detector such as the proposed 50 kton LENA (Low Energy Neutrino Astronomy) detector would provide a high-statistics measurement of terrestrial antineutrinos originating from β-decays of the uranium and thorium chains. Additionally, the neutron is scattered in the forward direction in the detection reaction . Henceforth, we investigate to what extent LENA can distinguish between certain geophysical models on the basis of the angular dependence of the geoneutrino flux. Our analysis is based on a Monte-Carlo simulation with different levels of light yield, considering an unloaded PXE scintillator. We find that LENA is able to detect deviations from isotropy of the geoneutrino flux with high significance. However, if only the directional information is used, the time required to distinguish between different geophysical models is of the order of severals decades. Nonetheless, a high-statistics measurement of the total geoneutrino flux and its spectrum still provides an extremely useful glance at the Earth’s interior.  相似文献