the alert to its citizens. At least 23,000 people did evacuate the coast after the quake, either fearing a tsunami or because their homes had been destroyed. Waves as high as still resulted in about 700 fatalities and 9,000 injuries. In the 2012 Indian Ocean sequence, the system alerted the Indian islands on Andaman and Nicobar within eight minutes. Some tsunami warning sirens in Aceh were delayed by about 20 minutes due to failure of the electrical grid caused by the proximity of the earthquake, and evacuation routes in Banda Aceh were jammed with traffic. Of the 28 countries that ring the Indian Ocean, now Australia, Indonesia and India are responsible for spearheading tsunami warnings in the area. References External links German Indonesian Tsunami Early Warning System Envirtech Tsunami Warning System, based on real time seafloor observatories measuring seismic waves and sea levels Disaster preparedness in Asia Warning systems Tsunami Indian Ocean