plate tectonics, volcanoes and earthquakes - Earth Sciences bibliographies - in Harvard style

In-text: (HVO, 2015)

Your Bibliography: HVO, H., 2015. The evolution of the tiltmeter at the Hawaiian Volcano Observatory. [online] Hvo.wr.usgs.gov. Available at: <http://hvo.wr.usgs.gov/volcanowatch/archive/2001/01_05_17.html> [Accessed 11 March 2015].

In-text: (Johnson, 2015)

Your Bibliography: Johnson, J., 2015. IRIS - GPS—Measuring Plate Motion. [online] Iris.edu. Available at: <http://www.iris.edu/hq/programs/education_and_outreach/animations/14> [Accessed 11 March 2015].

In-text: (Oskin and Bagley, 2014)

Your Bibliography: Oskin, B. and Bagley, M., 2014. Kilauea Volcano: Facts About the 30-Year Eruption. [online] LiveScience.com. Available at: <http://www.livescience.com/27622-kilauea.html> [Accessed 11 March 2015].

In-text: (How We Monitor Volcanoes, 2015)

Your Bibliography: Volcanoes.usgs.gov. 2015. How We Monitor Volcanoes. [online] Available at: <http://volcanoes.usgs.gov/activity/methods/index.php> [Accessed 11 March 2015].