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I en højmose i det centrale Himmerland findes spor af Danmarks ældste vejsystem. Ud fra mange års udgravninger fortælles historien om bl.a. de første stenlagte veje.
RESUMO O objetivo deste trabalho é apresentar uma nova medida de centralidade em grafos, a partir da matriz distância: proximidade espectral. Além de exibir algumas de suas propriedades, comparamos os resultados desta nova centralidade com a centralidade de proximidade. Um condi-ção suficiente para que um grafo possua o mesmo vértice como mais cent...
Citations
The spatial-temporal evolution of seismicity is examined, during the initial impoundment of Pournari reservoir located on Arachthos River (Western Greece), as well as for the next 30 years. The results show that, despite the relatively moderate-to-high seismicity from west to east, there is no remarkable earthquake in the vicinity before the first reservoir impoundment. Immediately after the impoundment (January 1981), and during the first 4 months, a considerable number of low-magnitude seismic events were recorded in the broader area of the dam. Moreover, two independent major events occurred on March 10, 1981 (M
L
= 5.6) and April 10, 1981 (M
L
= 4.7) with focal depths 13 and 10 km, respectively. The detailed analysis of the two corresponding aftershock sequences shows that they present different behaviors (e.g., larger b-value and lower magnitude of the main aftershock) than that of other aftershock sequences in Greece. This seismicity is probably due to triggering, via the water loading mechanism and the undrained response due to a flysch appearance on the reservoir basement. The activation of the thrust fault may be attributed to the bulging of evaporites that characterize the disordered structure of W. Greece, via possible water intake. The detailed processing of the recorded seismicity during the period 1982–2010, in comparison with the variations of Pournari Dam water level, shows an increase of shallow seismicity (h ≤ 5 km) in the vicinity of the reservoir up to a 10-km distance—in contrast to the initial period, characterized by a number of deeper events due to the background response change from undrained to drained status.
