भारत ने किस वर्ष आधिकारिक तौर पर राष्ट्रीय सुनामी प्रारंभिक चेतावनी प्रणाली की स्थापना और इसे अपनाया था?

What is the primary role assigned to the trained 'Aapda Mitra' volunteers raised under the disaster management initiatives?

The Lightning Early Warning System (LEWS) deployed to minimize casualties in Jharkhand is designed to generate short-range local alerts how early before a potential strike?