Strain Release in the Circum-Pacific Belt: Kern County 1952, Desert Hot Springs 1948, San Francisco 1957     

Seweryn J. Duda  Markus Båth 《Geophysical Journal International》1963,7(5):554-570

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Late Glacial and Holocene depositional history in the eastern part of the Szczecin Lagoon (Great Lagoon) basin—NW Poland     

Ryszard K. Borwka  Andrzej Osadczuk  Andrzej Witkowski  Brygida Wawrzyniak-Wydrowska  Tomasz Duda 《Quaternary International》2005,130(1):87

Analyses on 27 sediment cores taken from the bottom of the Szczecin Lagoon allowed environmental reconstruction of the postglacial main stages of basin development, based on detailed sedimentological, geochemical, diatomological and malacological studies of selected key cores. Studies revealed that during the Late Glacial and Holocene this area developed in several stages. In the Late Glacial the whole study area constituted a low alluvial plain. At the turn from Younger Dryas to Holocene the alluvial plain was cut through by the Odra river to a level of 10–11 m below sea level (b.s.l.). Along with the first phases of the Holocene marine transgression at the southern Baltic Sea's coasts the accumulation of the limnic-swampy deposits began in this lower part of the Odra valley. At ca. 6–6.5 ka BP the transgression proceeded and Littorina Sea waters flooded the area. At that time the Szczecin Lagoon constituted a marine embayment in which series of sands, partly rich in malacofauna, was deposited. The development of the Swina barrier resulted in the isolation of the embayment from the direct inflow of Baltic Sea waters.  相似文献   

Head waves in laterally heterogeneous media     

T. B. Yanovskaya  S. J. Duda 《Geophysical Journal International》1984,79(1):65-76

Summary. A layer of constant thickness over a half-space is assumed, and the propagation of head waves is considered for the following two cases: (1) the P -wave velocity varies in the layer in the horizontal direction, and is constant in the half-space: (2) the P -wave velocity varies in the half-space in the horizontal direction, and is constant in the layer. In each case the horizontal velocity gradient is assumed to remain constant. The wave propagation is investigated in the direction of the gradient (direct profile), and opposite to it (reverse profile). Formulae for the travel times and the amplitudes are obtained on the basis of ray-theoretical considerations. Conditions are discussed for the discrimination in a field experiment between the case of a sloping boundary separating the homogeneous media, and the case of an intrinsic horizontal velocity gradient.  相似文献   

Foreword     

Seweryn J. Duda 《Tectonophysics》1983,93(3-4)

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Physical significance of the earthquake magnitude — the present state of interpretation of the concept     

Seweryn J. Duda 《Tectonophysics》1978,49(3-4)

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Aquatic and terrestrial proxy evidence for Middle Pleistocene palaeolake and lake-shore development at two Lower Palaeolithic sites of Schöningen,Germany     

Kim J. Krahn  Mario Tucci  Brigitte Urban  Julien Pilgrim  Peter Frenzel  Ingeborg Soulié-Märsche  Antje Schwalb 《Boreas: An International Journal of Quaternary Research》2021,50(3):723-745

The archaeological sites in the open-cast mine of Schöningen, Germany, represent outstanding archives for understanding Middle Pleistocene interglacial–glacial transitions and human adaption. Aquatic microfossil and pollen assemblages from the ‘Reinsdorf sequence’, likely correlated to Marine Isotope Stage 9, document environmental changes from a thermal maximum to succeeding glacial conditions recorded in two sequences of excavation sites 12 II and 13 II. Multi-proxy analyses enable detailed reconstruction of lake-shore and landscape developments despite variable microfossil preservation in changing carbonate- and organic-rich deposits. Rich aquatic vegetation with abundant charophytes suggests repeated phases with water depths of 0.5–2 m at site 13 II, while even greater temporary depths are deduced for 12 II DB. Mesorheophilic and mesotitanophilic ostracod species indicate stream inflows with medium–low calcium contents of >18 mg Ca L^–1 originating from nearby springs. Diatoms point to meso-eutrophic conditions and an alkaline pH of the lake water. Interglacial conditions with thermophile forests but no aquatic microfossils preserved, suggesting a dry or only temporarily flooded site, mark the beginning of the sequence. Continuous presence of aquatic organisms and overall dominance of small tychoplanktonic diatoms during a subsequent cool steppe phase provide evidence for increased water depths and unstable habitats characterized by erosion and probably prolonged periods of lake ice cover. During the succeeding boreal forest-steppe phase, surface runoff into the productive, shallow lake decreased due to a more extensive vegetation cover. Concurrently, intensified groundwater input in contact with the nearby salt wall caused elevated salinities. Following a lake level drop, stream inflows and lake levels increased again towards the end of the Reinsdorf sequence and promoted development of a diverse fauna and flora at the lake shore; thereby maintaining an attractive living and hunting environment for early humans during a phase of generally cooler temperatures and landscape instability at the transition into a glacial period.  相似文献   

Doors and fences: Controlling Indonesia's porous borders and policing asylum seekers     

Antje Missbach 《Singapore journal of tropical geography》2014,35(2):228-244

Although the partial outsourcing of state border control to non‐state actors is not a new phenomenon, Indonesia is an interesting case study. Border control in an archipelago consisting of more than 17 000 islands is particularly challenging for state authorities. In addition to contending with the exceptional geography, Indonesia's state authorities are also challenged by the political constellation with Australia in regard to irregular cross‐border movements of asylum seekers that has become a controversial issue in recent history. As an important transit country for asylum seekers and refugees en route to Australia, Indonesia's porous borders have rendered it possible to enter and exit the country relatively easily. Given Australia's political pressure and the financial incentives offered to Indonesia to act as a ‘final bulwark’ and control irregular migration flows more effectively, border control nowadays has gained more significance in Indonesia than in the past. Yet, financial constraints and, more importantly, a lack of political will to host asylum seekers in its own territories for the long term remain as obstacles. Fieldwork observations show that due to ongoing funding restrictions for state‐led border control, state‐society cooperation for border surveillance has increased. Civilians in many hotspots for irregular border crossings have been encouraged to report on ‘suspicious foreigners’. State‐society cooperation for border control, however, offers new opportunities for people smugglers to pay off civilian spies or corrupt border authorities.  相似文献   

Long-term relationships between climate oscillation and basin-scale hydrological variability during rainy season in eastern Northeast Brazil     

Denis Duda Costa  Cintia B. Uvo  Adriano Rolim Da Paz  Frede De Oliveira Carvalho  Carlos R. Fragoso Jr 《水文科学杂志》2013,58(11):1636-1652

ABSTRACT

The high variability in the hydrological regime of the Eastern Hydrological Region (EHR) of Northeast Brazil often results in floods and droughts, leading to serious socio-economic issues. Therefore, this work aimed to investigate connections between spatiotemporal hydrological variability of the EHR and large-scale climate phenomena. Multivariate statistical techniques were applied to relate climate indices with hydrological variables within two representative river basins in the EHR. The results indicated a multi-annual relationship between the state of the sea surface temperature of the Atlantic and Pacific oceans and anomalous hydrological variability in the basins. In addition, the northern Tropical Atlantic conditions were shown to play an important role in modulating the long-term variability of the hydrological response of the basins, whilst only extreme ENSO anomalies seemed to affect the rainy season. This knowledge is an important step towards long-term prediction of hydrological conditions and contributes to the improvement of water resources planning and management in the EHR.  相似文献