We have introduced an early warning system for volatility regimes regarding Tehran Stock Exchange using Markov Switching GARCH approach. We have examined whether Tehran Stock Market has calmed down or more specifically, whether the surge in volatility during 2007-2010 global financial crises still affects stock return volatility in Iran.  Doing so, we have used a regime switching GARCH model.  ...

Each year, about 60 000 people and $4 billion (US$) in assets are exposed to the global tsunami hazard. Accurate and reliable tsunami warning systems have been shown to provide a significant defence for this flooding hazard. However, the evolution of warning systems has been influenced by two processes: deadly tsunamis and available technology. In this paper, we explore the evolution of science...

Studies have shown that the spatial distribution of severe thunderstorm warnings demonstrates variation beyond what can be attributed to weather and climate alone. Investigating spatial patterns of these variations can provide insight into nonmeteorological factors thatmight lead forecasters to issue warnings.Geographically weighted regression was performed on a set of demographic and land cove...

gradual increase of the earth's surface temperature can cause many significant changes on the climate of our planet. this problem is progressively increasing. one of the main reasons for this phenomenon is the absorption of the sun's energy and lack of proper reflection of emissions due to man-made activities, one of which is the increase in black surfaces. in this descriptive and cross-section...

Drought information systems have multiple sub-systems which include an integrated risk assessment, communication and decision support system of which early warning is a central component and output. There are numerous drought systems warning systems being implemented at different scales of governance from the international to the community. An early warning system is much more than a forecast-i...

—Early-warning information transmission can provide warning before emergence occur to avoid accident, and the key point is making the right vehicles in need obtain the right information. The stability of network structure and the effectiveness of channel allocation are deemed to be the key factors influencing early-warning information transmission performance. Considering Environmental noise f...