DEHRADUN: Four mountainous districts in Uttarakhand are facing a growing threat from earthquake-induced landslides, with Rudraprayag identified as the most vuln. Geoscientists warn that a 250-kilometre stretch of land in the state is under severe tectonic pressure, capable of triggering a massive earthquake of magnitude 7 to 8.The district-wise research, conducted by IIT Roorkee's Centre of Excellence in Disaster Management and Humanitarian Assistance, has been published in an international journal.