On 12 September 2007 the Tamil Nadu Government asked the coastal districts to remain on alert following fears of tsunami in the wake of the 7.9 magnitude powerful earthquake that rocked Sumatra near Indonesia. After the Union Home Ministry sounded an alert, the State Government instructed the district collectors of Chennai, Kancheepuram, Cuddalore, Nagapattinam, Thanjavur and Kanniyakumari to remain on high alert to meet any eventuality. On being alerted, the district administrations sounded the alert. In the aftermath of the events following the alert a lightning survey was conducted by the Academy for Disaster Management Education, Planning and Training’s (ADEPT) community volunteers (Community Support Leaders or CSLs).