познавательное
Бесплатные статьи от USGS
South Napa Earthquake – One Year Later
http://www.usgs.gov/blogs/features/usgs_top_story/south-napa-earthquake-one-year-later/
One Year Later – The Oso Landslide in Washington
http://www.usgs.gov/blogs/features/usgs_top_story/one-year-later-the-oso-landslide-in-washington/
2013 Volcanic Activity in Alaska: Summary of Events and Response of the Alaska Volcano Observatory
http://pubs.usgs.gov/sir/2015/5110/sir20155110.pdf
South Napa Earthquake – One Year Later
http://www.usgs.gov/blogs/features/usgs_top_story/south-napa-earthquake-one-year-later/
One Year Later – The Oso Landslide in Washington
http://www.usgs.gov/blogs/features/usgs_top_story/one-year-later-the-oso-landslide-in-washington/
2013 Volcanic Activity in Alaska: Summary of Events and Response of the Alaska Volcano Observatory
http://pubs.usgs.gov/sir/2015/5110/sir20155110.pdf