earthquakes are a particular concern because of the serious hazard they present. the existence of seismicity patterns such as the foreshock and aftershock clusters, doughnut pattern, seismic quiescence etc show that the earthquake occurrence in the active tectonic regions is not random and clustering phenomena are obvious characteristics of these events in space and time. fractal analysis, as a...

drought and salinity are the most important environmental stresses that are causing adverse effects on natural ecosystems. there are species among iranian natural germplasm that are resistant to environmental harsh conditions. restoring of degraded ecosystems, promoting of biodiversity and increasing of species richness will provide by identifying of these species. almond species with broad eco...