Introduction to Geohazards of Central China by T. A. Dijkstra, J. Wasowski, M. G. Winter, and X. M. Meng Quarterly Journal of Engineering Geology and Hydrogeology Volume 47(3):195-199 August 1, 2014 © 2014 The Geological Society of London

Shaded relief map of Central China, based on ChinaW Dataset (©Zumou Yue, G. William Skinner and Mark Henderson, University of California, Davis, Regional Systems Analysis Project, January 2007) and CHGIS, Version 4 (Harvard–Yenching Institute, Cambridge, MA, January 2007). Shaded relief map of Central China, based on ChinaW Dataset (©Zumou Yue, G. William Skinner and Mark Henderson, University of California, Davis, Regional Systems Analysis Project, January 2007) and CHGIS, Version 4 (Harvard–Yenching Institute, Cambridge, MA, January 2007). Provincial and country boundary information from gadm.org v2.0 (January 2012). T. A. Dijkstra et al. Quarterly Journal of Engineering Geology and Hydrogeology 2014;47:195-199 © 2014 The Geological Society of London

Examples of landscape transformation in the Lanzhou region. Examples of landscape transformation in the Lanzhou region. Upper three images are satellite images from Google EarthTM. (Google and the Google logo are registered trademarks of Google Inc., used with permission.) The lowermost photograph (by J. Wasowski, 2012) is a view of landscape modifications that continue to take place in north–central Lanzhou, taken from a position just south of the images above and looking north. T. A. Dijkstra et al. Quarterly Journal of Engineering Geology and Hydrogeology 2014;47:195-199 © 2014 The Geological Society of London

Examples of the impact of loess landslides in the Lanzhou urban environment and the intensive slope modifications and stabilization interventions that are required to safeguard lives and livelihoods in this dynamic environment. Examples of the impact of loess landslides in the Lanzhou urban environment and the intensive slope modifications and stabilization interventions that are required to safeguard lives and livelihoods in this dynamic environment. Upper three images are satellite images from Google EarthTM. (Google and the Google logo are registered trademarks of Google Inc., used with permission.) Lowermost photograph (by T. Dijkstra, December 2009) is a view of the 2009 landslide, taken from the street level in the centre of the images above. T. A. Dijkstra et al. Quarterly Journal of Engineering Geology and Hydrogeology 2014;47:195-199 © 2014 The Geological Society of London

The town of Zhouqu in 2009 before the debris-flow disaster, and in October 2010, 2 months after the disaster. The town of Zhouqu in 2009 before the debris-flow disaster, and in October 2010, 2 months after the disaster. The grey line in the 2009 photograph indicates the outline of the Sanyangyu watershed. (photographs T. Dijkstra). T. A. Dijkstra et al. Quarterly Journal of Engineering Geology and Hydrogeology 2014;47:195-199 © 2014 The Geological Society of London

The main discharge channel of the Zhouqu debris flow in October 2010 (top) and September 2012 (bottom) (photographs T. Dijkstra). The main discharge channel of the Zhouqu debris flow in October 2010 (top) and September 2012 (bottom) (photographs T. Dijkstra). T. A. Dijkstra et al. Quarterly Journal of Engineering Geology and Hydrogeology 2014;47:195-199 © 2014 The Geological Society of London

Engineered interventions in the discharge channels of the Sanyangyu valley where the Zhouqu debris originated; October 2010 (left) and September 2012 (right) (photographs T. Dijkstra). Engineered interventions in the discharge channels of the Sanyangyu valley where the Zhouqu debris originated; October 2010 (left) and September 2012 (right) (photographs T. Dijkstra). T. A. Dijkstra et al. Quarterly Journal of Engineering Geology and Hydrogeology 2014;47:195-199 © 2014 The Geological Society of London