Hans Keidel δ 28. August 1954     

H. Gerth 《International Journal of Earth Sciences》1957,45(3):930-956

Ohne Zusammenfassung  相似文献   

Transfrontier macroseismic observations of the Ml = 5.4 earthquake of February 22, 2003 at Rambervillers,France     

Michel?CaraEmail author  Wolfgang?Brüstle  Monika?Gisler  Philipp?K?stli  Christophe?Sira  Claire?Weihermüller  Jér?me?Lambert 《Journal of Seismology》2005,9(3):317-328

The 2003 Ml = 5.4 Rambervillers earthquake, north-east of France, is the largest seismic event recorded north of the Alps since the 1992 Ms = 5.3, I₀ = VII, Roermond earthquake, Netherlands. With a maximum macroseismic intensity of VI-VII EMS-98, the 2003 event was broadly felt to a distance of 300 km from the epicentre. It provides a unique opportunity to test and compare the different procedures used in France, Germany and Switzerland when evaluating macroseismic intensities. The main purpose of this paper is to present a common transfrontier macroseismic map based on the EMS-98 intensity scale. Maximum horizontal accelerations recorded in the area are compared to the intensity values, and we propose to use a differential technique to re-estimate the magnitude of the 1682 Remiremont, I₀ = VIII, earthquake, which occurred 40 km south of Rambervillers.  相似文献   

Electronic absorption spectroscopy of natural (Fe2+, Fe3+)-bearing spinels of spinel s.s.-hercynite and gahnite-hercynite solid solutions at different temperatures and high-pressures     

Michail N. Taran  Monika Koch-Müller  Klaus Langer 《Physics and Chemistry of Minerals》2005,32(3):175-188

Natural Fe²⁺, Fe³⁺-bearing spinel solid solutions from the spinel s.s.-hercynite and gahnite-hercynite series were analyzed and studied by electronic absorption spectroscopy in the spectral range 30000–3500 cm^–1 in the temperature and pressure ranges 77 T_K 600 and 10^–4 P_GPa 11.0. Two crystals were light-violet in color (type I) and six green or bluish-green (type II). The spectra of both types of spinels are dominated by an UV-absorption edge near 28000 to 24000 cm^–1, depending on the iron contents, and a very intense band system in the NIR centered around 5000 cm^–1, which is caused by spin-allowed dd-transition of tetrahedral Fe²⁺, derived from ⁵ E⁵ T₂. The strong band is in all spinels studied, split into four sub-bands, which can only be observed in very thin platelets. Between the UV-edge and the high-energy wing of the NIR-band there occur a number of very weak bands in type I spinels while the green type II spinels show some of these with significantly enhanced intensity. The intensity of the very weak bands is nearly independent from temperature. Such bands are attributed to spin-forbidden electronic transitions of ^IVFe²⁺. Temperature and pressure dependence of the intensity enhanced bands of spinels type II indicate that they are caused by ^IVFe²⁺ and ^VIFe³⁺. They are attributed to spin-forbidden transitions ⁶A_1g⁴A_1g, ⁴E_g, ⁴T_2g and ⁴T_1g of ^VIFe³⁺, the two latter being strongly intensified by exchange-coupling interaction with adjacent ^IVFe²⁺. The pressure dependence of ^IVFe²⁺ dd-band system in the NIR caused by spin-allowed ⁵ E⁵ T₂ transition noticeably differs from that of octahedral Fe²⁺, an effect which is attributed to a dynamic Jahn-Teller effect of ^IVFe²⁺ in the spinel structure.

Monika Koch-MüllerEmail: Phone: +49-331-288-1492/1402Fax: +49-331-288-1492/1402

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Earthquakes in Switzerland and surrounding regions during 2003     

Nicolas Deichmann  Manfred Baer  Jochen Braunmiller  Cécile Cornou  Donat Fäh  Domenico Giardini  Monika Gisler  Sarah Huber  Stephan Husen  Philipp Kästli  Urs Kradolfer  Martin Mai  Silvio Maraini  Ivo Oprsal  Thomas Schler  Danijel Schorlemmer  Stefan Wiemer  Jochen Wössner  Adrian Wyss 《Eclogae Geologicae Helvetiae》2004,97(3):447-458

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Provenance implications of Th–U–Pb electron microprobe ages from detrital monazite in the Carboniferous Upper Silesia Coal Basin, Poland     

Monika Agnieszka Kusiak  Artur K&#x;dzior  Mariusz Paszkowski  Kazuhiro Suzuki  Ignacio Gonzlez-lvarez  Boles&#x;aw Wajsprych  Marek Doktor 《Lithos》2006,88(1-4):56-71

This paper reports the results of CHIME (chemical Th–U–Pb isochron method) dating of detrital monazites from Carboniferous sandstones in the Upper Silesia Coal Basin (USCB). A total of 4739 spots on 863 monazite grains were analyzed from samples of sandstone derived from six stratigraphic units in the sedimentary sequence. Age distributions were identified in detrital monazites from the USCB sequence and correlated with specific dated domains in potential source areas. Most monazites in all samples yielded ca. 300–320 Ma (Variscan) ages; however, eo-Variscan, Caledonian and Cadomian ages were also obtained. The predominant ages are comparable to reported ages of certain tectonostratigraphic domains in the polyorogenic Bohemian Massif (BM), which suggests that various crystalline lithologies in the BM were the dominant sources of USCB sediments.  相似文献   

Identification of coccolithophore blooms in the SE Atlantic Ocean off Namibia by satellites and in-situ methods     

H. Siegel  T. Ohde  M. Gerth  G. Lavik  T. Leipe 《Continental Shelf Research》2007

Sporadic occurrences of milky turquoise waters visible in true colour satellite imagery in the Benguela upwelling system off Namibia are characterized by high reflectances due to enhanced scattering properties. Previous opinion was that the features are due to increased reflectances by elemental sulphur (S⁰) resulting from upwelling or eruptions of hydrogen sulphide-enriched waters.  相似文献   

Proton microprobe for chemical dating of monazite   总被引：1，自引：1，他引：0  

Monika Agnieszka Kusiak  Janusz Lekki 《Gondwana Research》2008,14(4):617

Although quantitative chemical analysis by proton microprobe has become an established technique, it has been rarely applied to problems in the earth sciences. The method, having lower detection limit (better than 10 ppm for U, Th and Pb) and higher spatial resolution than electron microprobe (typically 1 μm vs 3 μm), can be successfully used in geology. Here, we present a procedure for the chemical dating of monazite, (REE)PO₄, by proton microprobe. The procedure is compared with electron probe microanalysis technique (EPMA).  相似文献   

Long periodic variations of magnetic stars caused by precession     

E. Gerth 《Astronomische Nachrichten》1984,305(6):329-332

Über lange Zeiten erstreckte Beobachtungen einiger Ap-Sterne ergeben deutliche säkulare Variationen der effektiven magnetischen Feldstärke, welche – neben anderen Interpretationsmöglichkeiten – auf die Präzessionsbewegung des Sterns zurückgeführt werden können. Die Präzession eines durch Rotation abgeflachten Sterns wird durch die Orbitalbewegung eines Begleiters mit einer gegen die Rotationsachese des Sterns geneigten Bahnebene oder durch Rotation der inneren gegenüber den äußeren Schichten des Sterns um unterschiedlich geneigte Achsen verursacht.  相似文献   

Magnetic field and radial velocity of the Ap star 52 Her. I. Observations,measurements, results     

E. Gerth 《Astronomische Nachrichten》1990,311(1):41-48

Since 1971 the magnetic Ap star 52 Her has been investigated with respect to its magnettic field and radial velocity on the observational basis of 140 photographic Zeeman spectrograms obtained at the 2m-telescope in Tautenburg. Additionally, 47 normal spectrograms were used for the determination of the radial velocity only. The technical foundation for observation and measurement is considered. The main purpose of the paper, however, is the documentation of the observations and the measuring results. Deductions drawn from the material assorted here or taken from other sources are put off to following papers.  相似文献   

Zeitlich periodische Variationen des solaren Neutrinoflusses und das Standardmodell der Sonne     

H. J. Haubold  E. Gerth 《Astronomische Nachrichten》1983,304(6):299-304

The FOURIER analysis of the measured ³⁷Ar production rate for DAVIS well known solar neutrino experiment shows time variations of the solar neutrino flux with periods of 100.0, 58.8, 35.7, 25.6, 19.6, 15.2, 8.8, and 6.3 months, respectively. We discuss physical assumptions of the standard solar model which are not generally confirmed by observations and trace back the time variations of the neutrino flux with the time scale of the order of years to gravity oscillations of the solar centre.  相似文献