Space-based services are used to map the distribution of potential lahar source materials and old lahar deposits and to delineate the possible extent of future lahars in active and potentially active volcanoes.
8. 利用空间服务来绘制潜在火山泥流来源物质分布图和老火山泥流沉积图，并画出活火山和潜在活火山今后火山泥流的可能范围轮廓。