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101.
Oldřich Novotný 《Studia Geophysica et Geodaetica》1970,14(1):36-50
Zusammenfassung Es werden Formeln abgeleitet, die die Gruppengeschwindigkeit und partielle Ableitungen der Phasen- und Gruppengeschwindigkeit
der Love-Wellen im geschichteten Medium zu berechnen erm?glichen, und zwar ohne Verwendung der numerischen Ableitungen. Die
Berechnungen mit Hilfe dieser Formeln sind vielfach schneller als bei Verwendung der numerischen Methoden; sie sind sogar
genauer, besonders bei der Berechnung der partiellen Ableitungen der Gruppengeschwindigkeit. Ausführlich werden die partiellen
Ableitungen der Dispersionskurven der Love-Wellen für das Model des Kanadischen-Schilds studiert.
Address: Ke Karlovu 3, Praha 2. 相似文献
Address: Ke Karlovu 3, Praha 2. 相似文献
102.
Jaromír Janský 《Studia Geophysica et Geodaetica》1970,14(3):286-295
Zusammenfassung Den Gegenstand der Arbeit bildet die Berechnung der Laufzeit- und Amplitudenkurve einer Refraktionswelle für bestimmtes gegebenes
Medium anhand der Ersetzung dieses Milieus durch horizontal geschichtetes Medium mit stetigen Geschwindigkeitsgradienten an
den Grenzen einzelner Schichten, wobei man an die Arbeit anknüpft, die sich mit geschichtetem Medium mit konstanten Geschwindigkeitsgradienten
in den Schichten befasste. Ausser der Anführung der Berechnungsformeln wird auch die Frage der Beseitigung der falschen und
Einhaltung der realen Inflexionen auf dem ersetzenden Geschwindigkeitsschnitt diskutiert. Die Ergebnisse der Berechnung nach
dem zusammengestellten Programm werden mit einem Beispiel illustriert.
Address: Ke Karlovu 3, Praha 2-Nové Město. 相似文献
Address: Ke Karlovu 3, Praha 2-Nové Město. 相似文献
103.
The spatial and temporal brightness distributions of the Fe XIV 530.3 nm coronal green line (CGL) and cyclic variations of these distributions are analyzed for a long time interval covering more than five 11-year cycles (1943–2001). The database of line brightnesses is visually represented in the form of a movie. Substantial restructuring of the spatial distribution of the CGL brightness occur over fairly short time intervals near the so-called reference points of the solar cycle; such points can be identified based on various sets of solar-activity indices. Active longitudes are observed in the CGL brightness over 1.5–3 yr. Antipodal and “alternating” active longitudes are also detected. The movie can be used to compare the CGL brightness data with other indicators of solar activity, such as magnetic fields. The movie is available at http://helios.izmiran.rssi.ru/hellab/Badalyan/green/. 相似文献
104.
P. Špaček Z. Sýkorová J. Pazdírková J. Švancara J. Havíř 《Studia Geophysica et Geodaetica》2006,50(2):233-258
The Variscan Bohemian Massif is disrupted by the NW-SE striking Elbe Fault System in its northern part. The increased tectonic
activity associated with this structure is manifested by increased seismicity in the eastern part of the Sudetes. With the
use of a temporary local seismic network, the total number of micro-earthquakes located in this region increased to 153 for
the period 1996–2003. The local magnitudes vary between −0.6 and 1.8 and the seismic energy was often released in swarm-like
sequences. Five seismic events with well-defined P-onset polarities at five or six stations enabled the estimation of focal
mechanisms. The present-day activity of the WNW-ESE to NNW-SSE fault systems is discussed on the basis of source mechanisms,
the alignment of the epicentres, as well as morphological and geological evidence. The majority of the recent seismic activity
is concentrated in a 40–60 km wide zone of a generally NW-SE trend. This structure represents a regional zone of weakness
within the SE termination of the Elbe Fault System, defined by a mesh of interconnected faults, of which many are deep-seated
and highly permeable and some are associated with light to moderate historical earthquakes. Both in the areas due south and
due north of this zone the present-day seismic activity is very low. The increased tectonic activity can be interpreted as
a result of the abundance of suitably oriented faults and their interconnection into major fault systems, the proximity of
the Outer Carpathian indentor and the Cainozoic volcanic and associated recent post-volcanic activity. The similar character
of swarms and their coincidence with the post-volcanic activity in the southeastern part of the Elbe Fault System and in some
focal zones of the western Bohemian seismically active area suggests that overpressurized fluids may represent a potential
swarm-triggering mechanism. 相似文献
105.
106.
Summary Fresnel volumes and interface Fresnel zones of transmitted and head waves are studied. The relation derived for transmitted waves may also be used for converted reflected waves. Considerable attention is devoted to the penetration of Fresnel volumes across structural interfaces, particularly for head waves. 相似文献
107.
Summary We search for the effects of the interplanetary magnetic field (IMF) sector boundary crossing (SBC) in upper stratospheric ozone. The SBUV data (Nimbus-7) at the 10, 3 and 1 hPa levels are analysed for latitudes 45° N and 55° N for winters of the period December 1979 to December 1982. An effect of the IMF SBC wos only found at the 10 hPa level. These first results concerning the IMF SBC effect in upper stratospheric ozone are rather preliminary.
¶rt;m uu nu mau () nam aum n () a mam. SBUV ¶rt;a (u-7) a nm ¶rt;au 10, 3 u 1a aauum ¶rt; um 45° u 55° . . ua nu¶rt;a ¶rt;a 1979 – ¶rt;a 1982. m uu a¶rt; m a 10a. mu n mam n uuu a mam m n¶rt;aumu.相似文献
108.
Jaroslav Kubík Reviewer A. Janáčková Reviewer V. Červený 《Studia Geophysica et Geodaetica》1988,32(3):287-299
Summary The dependence between Pn-wave velocities and the surface heat flow, temperature at the core-mantl boundary and thickness of the Earth's crust for continents (Europe, Asia, North America and Australia) was investigated statistically in connection with the problem of lateral inhomogeneities in the upper mantle. The relations obtained were compared with those determined under laboratory conditions. The conclusion is that temperature and pressure effects may provide additional explanations of the regional variations of Pn-wave velocities observed in most continents.
auum ¶rt;auu mu n¶rt; a nmu uua(Pn ), nm mn nm, mnam a u m mum a u¶rt;aa u n uuuma ¶rt;¶rt;m mu Pn. nua ¶rt;a mama aam u¶rt;au nu m n¶rt; amuu u u ¶rt;au u mnam a¶rt;um mmmuu mamau n¶rt;aa am. am ¶rt;, m ua uu m Pn- ¶rt; amu muma n¶rt;m auu m¶rt;uauu u a nmu muua.相似文献
109.
110.
Summary The ionospheric effects of the interplanetary magnetic field (IMF) sector boundary crossings are studied for the winters of 1963–69. They are considerably stronger for proton than for non-proton sector boundaries. There are two different types of effects. The geomagnetic type is a disturbance, observed in geomagnetic activity, the night-time ionosphere and the day-time F2 region near the geomagnetic equator. The effect in the ionosphere is interpreted in terms of the IMF sector boundary crossing related changes in geomagnetic activity. The tropospheric type is aquietening, observed in tropospheric vorticity and in the day-time mid-and low-latitude ionosphere (except the geomagnetic equator region). The mechanism of this effect remains unexplained.
¶rt;m u m nu mau nam aum n () ¶rt; u 1963–69. u m u ¶rt; nm ¶rt; a mau. mm ¶rt;a m¶rt; muna m. aum m u, a¶rt;a aum amumu, u u ¶rt; F2 amu uuaum ama. mu u m ¶rt;mu uu aum amumu, m a nu mau . n mun m nu, a¶rt; aumu mn u ¶rt; ¶rt;- u uum u (a uu amuaum ama). au m ma um.相似文献