El Salvador is a small country in Central America (Figure 1). It has a savanna climate, with daytime temperatures consistently between 25°–30°C. The rainy season extends from May to October, while November to April is generally very dry. Rainfall is about 1,800 mm per year. These weather conditions are favorable for producing sugar and coffee. The population is about 6.0 million with a high concentration in the capital city, San Salvador, where 1.8 million persons are living now. The earthquakes of 13 January and 13 February 2001 demonstrated the high vulnerability in El Salvador and strongly affected people...

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