Unit 1: Slip-sliding away: case study landslides in Italy and Peru

Unit 1 Learning Outcomes

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Yungay Viejo (2500 m) as seen from the cemetery hill. The light shaded area shows the location of the landslide (ice, mud, debris avalanche) on 31.05.1970, caused by an earthquake, in which a part of the western flank of Huascaran Norte broke (6652 m).

Provenance: https://commons.wikimedia.org/wiki/File%3AYungay_Viejo_-_location_of_landslide_1970.jpg
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• Students will analyze geological and climatological factors that contributed to the 1970 Nevado Huascarán and 2010 San Fratello mass-wasting events.
• Students will evaluate the impact of mass-wasting events on the landscape, infrastructure, and human life for the communities affected by the 1970 Nevado Huascarán and 2010 San Fratello mass-wasting events.
• Students will hypothesize about factors that lead to geohazard-related personal and policy decisions.
  
  Show More info on how learning outcomes connect to science literacy principles and module goals
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  Supports Module Goal 2
  Supports Earth Science Big Ideas(links open in new windows)
  ESBI-1: Earth scientists use repeatable observations and testable ideas to understand and explain our planet
  ESBI-3: Earth is a complex system of interacting rock, water, air, and life
  ESBI-4: Earth is continuously changing
  ESBI-8: Natural hazards pose risks to humans.

Unit 1 Teaching Objectives

• Cognitive: Using case studies from Peru and Sicily, provide opportunities for considering the interaction between geology, landscape, climate, and infrastructure in the causes and effects of a mass-wasting event.
• Affective: Facilitate thinking about how mass-wasting events impact social, economic, and political systems and the importance of hazard mitigation and adaptation for residents.

The content in Unit 1 is appropriate for introductory geology, hazards, and other geoscience courses; sophomore-level courses in which geodesy and/or geomorphology/surface processes are being introduced; or non-geoscience courses where infrastructure planning, Earth hazards, and/or the nature and methods of science are being investigated. Unit 1 activities can be adapted to serve small- or large-enrollment classes and can be executed in lecture and lab settings. Although Unit 1 may be implemented as an individual homework assignment, it is best used as an in-class activity in which students work in small groups. This is the introductory unit to the Surface Process Hazards module and precedes Unit 2: Reading the landscape on identifying landscape characteristics using topo maps, lidar hillshade maps, and aerial imagery.

Before coming to class, students should have read the article (below) on the Peru and Sicily study sites. Depending on how the instructor chooses to implement this section (i.e., think-pair-share, small-group discussion, gallery walk, or interactive lecture), she or he may decide that students should read both parts of the reading OR assign half of the class the Peru case study and the other half the Sicily case study. During class, think-pair-share, small-group discussion, gallery walk, or whole-group discussion formats are equally appropriate. Faculty may choose to select a subset of these questions depending on time constraints, enrollment, etc.

• Unit 1 Student Case Study Reading - Peru and Italy (Microsoft Word 2007 (.docx) 33.4MB Jul11 17)
  Unit 1 Student Case Study Reading - Peru and Italy PDF (Acrobat (PDF) 14.8MB Jul11 17)
• Unit 1 Introductory Presentation (PowerPoint 2007 (.pptx) 1011kB Jun12 17)
  • Optional powerpoint slides to use as an introduction to this module and Unit 1; covers the purpose of the module and how to use a "case study."
    
    
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Suggested discussion questions
(Also available in Word: Unit 1 Case Study Discussion Questions (Microsoft Word 2007 (.docx) 201kB Jun11 17))

1. Nevado Huascarán is composed primarily of granodiorite. Based on the tectonic setting of the area, propose a hypothesis about how Nevado Huascarán formed.
2. Would you expect seismicity to be a risk factor in the generation of landslides in the Nevado Huascarán and/or San Fratello study sites? Why/why not? If so, in which study area would you be MOST concerned about seismic hazards? Why?
3. Propose some factors that could have contributed to the Nevado Huascarán rock and ice fall turning into a debris flow.
4. In both study areas, scientific and historical evidence exists suggesting that mass-wasting events have occurred in the past. If this is the case, why do people continue to inhabit these areas?
5. What was water's role in the Nevado Huascarán and San Fratello events?
6. Mass-wasting events also occur in areas that receive very little precipitation. Propose some ideas for what might trigger slope failure in dry regions.
7. What might be some of the challenges in studying past mass-wasting events and predicting future events?
8. How have the community/government responses to the Nevado Huascarán and San Fratello events been different? How do you think that community and government officials would respond to a similar event in the United States?
9. Briefly describe the geological and climatological differences between the Nevado Huascarán and San Fratello sites. In both cases, how did the geology and climate contribute to the development of the slide?
10. Compare and contrast how infrastructure and human life were affected by the mass-wasting events in both locations.
11. Provide some specific ideas about how future climate change could impact mass-wasting events/hazards.
12. What did you learn about these two case study landslides that surprised you?
13. What else would you want to investigate about the sites to help the community make planning decisions?

It worked well to give the reading in this unit as a homework assignment accompanied by the list of potential discussion questions. Students were able to reflect on the potential discussion questions and make notes prior to the class discussion. A ~20–30 minute class discussion of the reading worked well as an introduction to the module and as a transition to the brief lecture material at the beginning of Unit 2. Students could be broken up into small groups to discuss a few discussion questions before entering a full class discussion.

This is an introduction to the Surface Process Hazards module with no formal assessment. However, faculty may choose to conduct a summative assessment of this unit by having a whole class report-out on the discussion questions or by collecting written responses to the discussion questions. It is helpful to have a written record of student responses to the discussion questions as a reminder to students during subsequent module units.

• Carey, Mark. In the Shadow of Melting Glaciers: Climate Change and Andean Society, Oxford University Press, 2010.
• Cluff, L., 1971. Peru earthquake of May 31, 1970; Engineering geology observations. Bulletin of the Seismological Society of America, 61(3), 510-533.
• Evans, S. G., Bishop, N. F., Smoll, L. F., Murillo, P. V., Delaney, K. B., Oliver-Smith, A., 2009. A re-examination of the mechanism and human impact of catastrophic mass flows originating on Nevado Huascarán, Cordillera Blanca, Peru in 1962 and 1970. Engineering Geology, 108, 96-118.
• Farber, D. L., Hancock, G. S., Finkel, R. C., and Rodbell, D. T., 2005. The age and extent of tropical alpine glaciation in the Cordillera Blanca, Peru. Journal of Quaternary Science, 20(7-8), 759-776.
• Urrutia, R., and Vuille, M., 2009. Climate change projections for the tropical Andes using a regional climate model: Temperature and precipitation simulations for the end of the 21st century, Journal of Geophysical Research,114, doi:10.1029/2008JD011021.
• Schauwecker, S., Rohrer, M., Acuña, D., Cochachin, A., Dávila, L., Frey, H., Giráldez, C., Gómez, J., Huggel, C., Jacque-Coper, M., Loarte, E., Salzmann, N, and Vuille, M., 2014. Climate trends and glacier retreat in the Cordillera Blanca, Peru, revisited, Global and Planetary Change, 119, 85-97
• Article: Piantelli, E., 2013. Monitoring Mother Nature's Forces. The Global Magazine of Leica Geosystems, Reporter 69, 3-5.
• Article: Cafiso, F., 2013. New Technologies Employed in Studying, Monitoring, and Stabilizing the San Fratello Landslide (Sicily, Italy). Landslide Science and Practice, 369–376.
• Article: Bardi et al., 2014. Integration between ground based and satellite SAR data in landslide mapping: The San Fratello case study. Geomorphology, 223, 45-60. doi:10.1016/j.geomorph.2014.06.025
• Report: On the San Fratello landslide by the Geologic Service of Italy