LEAD: A new website now totals up landslide occurrences and resulting deaths across the U.S. and the world.1. NASA and other researchers have tracked global news and web reports of rain-caused landslides since 2007.2. Between 2007 and 2013, more than 20,000 people have died in 6,000 landslides - an average of 2,500 per year.3. An interactive website will help researchers match future news reports of landslides with the data of heavy rain from a new satellite-based network covering Earth.TAG: Early warning for potential landslides is the long-term goal.
