Activité frontale ; Années 1979-2007 ; Asie ; Asie de l'Est ; Circulation atmosphérique ; Dynamique de l'atmosphère ; Perturbation atmosphérique ; Périodicité ; Téléconnexion ; Variabilité interannuelle
L'activité frontale et les perturbations cycloniques à l'origine des « pluies des prunes » présentent une forte variabilité interannuelle, mais celle-ci n'est pas uniforme sur l'ensemble de l'espace touché, avec des périodicités d'environ 2 ans à
Morphotectonic evidence from lateral propagation of an activefrontal fold; Pakuashan anticline, foothills of Taiwan
This paper demonstrates that a combined study, based on geomorphological, stratigraphical and tectonic analysis, allows precise understanding of the structure and evolution of an active fold. The aims of the study are to document : 1) the structures
that accommodate lateral propagation on an active fold; 2) the orientation of the principal stress-axis inferred from fault population analysis in the pretectonic Toukoshan Formation and syntectonic deposits; and 3) the tectonic geomorphology of the Pakuashan
Late Pleistocene - Holocene tectonic activities in the frontal part of NE Himalaya between Siang and Dibang river valleys, Arunachal Pradesh, India
This region, drained by major river system, represents an ideal environment for fluvial fan and terrace formation. On the basis of analysis of Quaternary landforms the faults that were active during the Late Pleistocene-Holocene were identified
. Imprints of active tectonics on the landforms are discernible in the form of tilted fans, colluvial deposits and terraces, truncation of toe of fan, linear fault scarps and thrusting of Siwalik rocks over the colluvial deposits. OSL dates for fans
and terrace deposits indicate tectonic activities between 8 and 56 ka. It is showed that geomorphic evidence, chronology of depositional landforms, deformation of Quaternary landforms and soft-sediment deformation structures provide baseline information about
Late Holocene solifluction lobe activity in the Mount Rae area, southern canadian Rocky Mountains
millénaires. La moyenne à long terme des taux de progression du mouvement frontal des deux côtés est de 0,49 cm/an, cependant les valeurs varient de 0,35 à 1,50cm/an.
Wet/cool (dry/hot) summers with active (weak) Baiu frontalactivity are closely related to El Nino (anti-El Nino) over the equatorial Pacific. The socio-economic impacts of El Nino year in 1982-1983 were analysed for agricultural production, energy
Tectonic geomorphology at a plate boundary : a transect across Hawke Bay, New Zealand in The geomorphology of plate boundaries and active continental margins.
In a transect across northern Hawke Bay from the Hikurangi Trench to the Taupo volcanic Zone there are four major tectonic domains, an accretionary slope, a forearc basin, a frontal ridge, and a backarc basin. Within each of these, landform
In this paper, kinematical analysis of frontal anticlines and spatial mapping of active faults based on geomorphological features such as drainage pattern development, fault scarps and uplifted Quaternary alluvial fans are presented. The AA. analyse
the geomorphic and hydrographic expressions of the Chandigarh and the Janauri active anticlines in the NW India Siwaliks. To investigate the morphological scenario during the folding process, they used spatial imagery, geomorphometric parameters extracted from
. Heavy-minerals analysis also points to the market similarity of the sediments examined. The results of all the analyses carried out preclude the activity of intensive aeolian processes, either before the Vistulian ice-sheet advancement during
the Pomeranian Phase or on the foreland of the frontal moraine zone. - (BJ)
Alpes du Sud ; Bassin-versant ; France ; Glaciaire ; Hautes-Alpes ; Montagne ; Moraine frontale ; Paraglaciaire ; Petit âge glaciaire ; Recul du glacier ; Transport sédimentaire
glaciaire récent (postérieur au petit âge glaciaire). Des blocages, provoqués par une moraine frontale, entravent les transferts entre les réservoirs des sédiments : alors que des débris grossiers constituent la moraine frontale, seuls des débris fins
bandes actives dans le secteur du Pré du Tabuc. Ce schéma suggère l'existence de ruptures dans la chaîne des processus paraglaciaires, même si d'imposants volumes de matériaux glaciaires restent disponibles.
Active tectonics in and around Kimin-Ziro area, Lower Subansiri District, Arunachal Pradesh, NE India
a very high sinuosity. Subsequent events of uplift resulted in the formation of entrenched meanders due to incision of the valley floor. The data suggest that tectonic activity along the Main Boundary Thrust (MBT) and Himalayan Frontal Thrust (HFT) during
The aim of this study is to present geomorphic evidence of neotectonic activity along the mountain front and within the Lesser Himalaya and to reveal the pattern of neotectonic movement in view of orogenic development. High-resolution satellite data
Discussion of the results of the investigations of organic matter in the SW Atlantic, in the Polar Frontal Zone. The present goal was organic matter distribution at the period of its accumulation and bacterioplankton activization anomalously warm
of off-shore seismic lines shows that the advance of the frontal part of the chain stopped during the Early Pleistocene ; on the other hand new onshore geological data indicate an accretionary wedge under sub-critical conditions affected
by internaldeformation due to the activation of deep transgressive crustal structures. - (NF)
The possible interactions between tectonics and landform formation in an active chain are examined by considering the case example of the Southern Apennines fold-and-thrust belt, in which frontal accretion and back-arc extension coexisted. The study
frontales lorsqu'elles s'approchent des obstacles montagneux. A partir des résultats obtenus sont élaborées des recommandations pour localiser la région où se manifestent le plus activement des processus de convection dangereux (accompagnés de chute de grêle
The AA. used geological, structural and morphotectonic data to draw a N-S-striking section between Bologna and Ferrara, aimed at analyzing whether and how the deformation is partitioned among the frontal thrusts of the Northern Apennines
and identifying the potential sources of damaging earthquakes. The AA. pointed out active anticlines based on the correspondence among drainage anomalies, historical seismicity and buried ramps. They also analyzed the evolution of the Plio-Quaternary deformation
the Messinian portion of the local stratigraphical succession. The structural and stratigraphic features of the recognized UBSU allow the AA. To locate their related sedimentary basin within the frontal portion of the Apennine chain, behind the leading edge
of the central Apennines where active trust were building the Messinian chain. - (NF)
Dust events in the Mojave Desert characteristically occur during the winter to spring months (February-May), associated with dry frontalactivity, and are largely absent during the dry summer months. The Colorado Desert experiences a similar
by the active Himalayan Frontal Thrust (HFT), which is offset along the transverse Jhirna Fault (JF) and Kalagarh Fault (KF). The middle part of the PZ is longitudinally traversed by the blind, oblique-slip Najibabad Fault (NF). The incised river valley surfaces
have developed in response to climate driven reduction in sediment and water budget. However, tectonic activities have influenced their disposition by controlling the channel swinging and migration. Active movements along the faults have further
convections actives, l’A. utilise le calcul de la zone de croisement de la vorticité potentielle d’Ertel avec les zones frontales baroclines dans la basse troposphère. L’A. utilise les données des prévisions météorologiques issues des modèles hydrodynamiques
Etude de la méthode de prévision des grains météorologiques, basée sur la détermination des zones de convection active et le calcul, selon la vitesse du vent dans les zones de troposphère, des bourrasques maximales à terre. Pour la prévision des
glacierets supérieurs et de niveaux de béton de glace d'origine périglaciaire. la langue du glacier rocheux peut être actuellement dépourvue de glace (Sainte-Anne), alors que la partie frontaleactive paraît toujours contenir un noyau de sédiments faiblement