A new animation of subduction zone processes developed for the undergraduate and community college audience

Today’s undergraduate students are accustomed to animations as impor­tant to their learning. Complex geologic processes such as subduction are well suited to animation. In spite of this opportunity and need, high-quality animations of fundamental Earth processes are uncommon. We have produced a realistic animation of plate creation and destruction processes for the undergraduate audience. First steps focused on building a storyboard, which is a visual outline of scenes to be animated. Then we organized a team of geoscientists and animators to make the animation. Students generated a rough draft animation, which was polished by a professional animator. We also wrote a narrative that was keyed to the animation, with written “call outs” inserted when terms that may be unfamiliar to undergraduates were spoken. Concepts in the animation are explicitly linked to the scientific literature, with references intended to guide interested viewers to sources to learn more. After the animation and narration were completed, we focused on dissemination and assessment. The animation (“Plate Tectonics Basics 1”) was placed on YouTube and the Science Education Resource Center (SERC) portal, and a Japanese version was made. Presentations about the animation were given at the Geological Society of America (GSA) annual meeting and the American Geophysical Union (AGU) Fall meeting. Assessment focused on capturing student understandings before and after watching the animation. Three groups of students were assessed: community college students and lower- and upper-level students at a four-year university. Results of the assessment indicate that students at all levels improved their understanding of subduction zone processes after experiencing the animation, but that upper-level students showed the greatest improvement. More high-quality animations about important plate tectonic processes and additional research into the level of complexity for various student groups are required.

[1]  P. Clift,et al.  Controls on tectonic accretion versus erosion in subduction zones: Implications for the origin and recycling of the continental crust , 2004 .

[2]  D. Sandwell,et al.  Lithospheric bending at subduction zones based on depth soundings and satellite gravity , 1995 .

[3]  B. Hanan,et al.  Seamounts in the Subduction Factory , 2010 .

[4]  M. Bevis,et al.  Near-simultaneous great earthquakes at Tongan megathrust and outer rise in September 2009 , 2010, Nature.

[5]  J. Longo,et al.  An Experimentally Derived Kinetic Model for Smectite-to-Illite Conversion and Its Use as a Geothermometer , 1993 .

[6]  B. Reynard Serpentine in active subduction zones , 2013 .

[7]  P. Molnar,et al.  Lengths of intermediate and deep seismic zones and temperatures in downgoing slabs of lithosphere , 1979 .

[8]  A. Taira,et al.  Coseismic fault rupture at the trench axis during the 2011 Tohoku-oki earthquake , 2012 .

[9]  Nobuhito Mori,et al.  Survey of 2011 Tohoku earthquake tsunami inundation and run‐up , 2011 .

[10]  C. Findlay,et al.  Subduction erosion along the Middle America convergent margin , 2000, Nature.

[11]  R. Huene,et al.  OBSERVATIONS AT CONVERGENT MARGINS CONCERNING SEDIMENT SUBDUCTION, SUBDUCTION EROSION, AND THE GROWTH , 1991 .

[12]  M. Yamano,et al.  The seismogenic zone of subduction thrust faults , 1997 .

[13]  K. Fischer,et al.  he global range of subduction zone thermal models , 2010 .

[14]  J. Hermann,et al.  Geochemistry of continental subduction-zone fluids , 2014, Earth, Planets and Space.

[15]  Simon M. Peacock,et al.  Serpentinization of the forearc mantle , 2003 .

[16]  C. Kincaid,et al.  Diapiric Flow at Subduction Zones: A Recipe for Rapid Transport , 2001, Science.

[17]  T. Plank Constraints from Thorium/Lanthanum on Sediment Recycling at Subduction Zones and the Evolution of the Continents , 2005 .

[18]  Emile A. Okal,et al.  Metastable mantle phase transformations and deep earthquakes in subducting oceanic lithosphere , 1996 .

[19]  Thomas F. Shipley,et al.  Drawing on Experience: How Domain Knowledge Is Reflected in Sketches of Scientific Structures and Processes , 2014, Research in Science Education.

[20]  T. Gerya,et al.  Deep slab hydration induced by bending-related variations in tectonic pressure , 2009 .

[21]  G. Bebout Metamorphic chemical geodynamics of subduction zones , 2006 .

[22]  A. Schultz,et al.  Mid-Ocean Ridge Hydrothermal Fluxes and the Chemical Composition of the Ocean , 1996 .

[23]  Tomokazu Kobayashi,et al.  Coseismic and postseismic slip of the 2011 magnitude-9 Tohoku-Oki earthquake , 2011, Nature.

[24]  K. Ramachandran,et al.  Possible emplacement of crustal rocks into the forearc mantle of the Cascadia Subduction Zone , 2003 .

[25]  P. Kelemen,et al.  Thermal Structure due to Solid‐State Flow in the Mantle Wedge Beneath Arcs , 2013 .

[26]  Y. Dilek,et al.  Oceanic Core Complex Development in Modern and Ancient Oceanic Lithosphere: Gabbro‐Localized versus Peridotite‐Localized Detachment Models , 2010, The Journal of Geology.

[27]  Stephen J. Reynolds,et al.  Concept Sketches – Using Student- and Instructor-generated, Annotated Sketches for Learning, Teaching, and Assessment in Geology Courses , 2005 .

[28]  E. Geist,et al.  Great (≥Mw8.0) megathrust earthquakes and the subduction of excess sediment and bathymetrically smooth seafloor , 2015 .

[29]  S. Ide,et al.  Regional and global variations in the temporal clustering of tectonic tremor activity , 2014, Earth, Planets and Space.

[30]  H. Shiobara,et al.  Stagnant slab : A review , 2009 .

[31]  S. Solomon,et al.  THE STRUCTURE OF MID-OCEAN RIDGES , 1992 .

[32]  L. Parson,et al.  Focused magmatism versus amagmatic spreading along the ultra‐slow spreading Southwest Indian Ridge: Evidence from TOBI side scan sonar imagery , 2004 .

[33]  G. Fryer,et al.  An Introduction to Convergent Margins and Their Natural Hazards , 2016 .

[34]  G. Abers,et al.  Subduction factory: 4. Depth-dependent flux of H2O from subducting slabs worldwide , 2011 .

[35]  E. Parmentier,et al.  Effect of solid flow above a subducting slab on water distribution and melting at convergent plate boundaries , 2007 .

[36]  Eric Farrar,et al.  A NEW ANIMATION OF SUBDUCTION PROCESSES FOR UNDERGRADUATES , 2015 .

[37]  Klaus Mosegaard,et al.  MONTE CARLO METHODS IN GEOPHYSICAL INVERSE PROBLEMS , 2002 .

[38]  M. McDaniel,et al.  Learning Styles , 2008, Psychological science in the public interest : a journal of the American Psychological Society.

[39]  S. Peacock Are the lower planes of double seismic zones caused by serpentine dehydration in subducting oceanic mantle , 2001 .

[40]  A. Rietbrock,et al.  Order of magnitude increase in subducted H2O due to hydrated normal faults within the Wadati-Benioff zone , 2014 .

[41]  Ellen M. Syracuse,et al.  Global compilation of variations in slab depth beneath arc volcanoes and implications , 2006 .

[42]  H. Jung,et al.  Intermediate-depth earthquake faulting by dehydration embrittlement with negative volume change , 2004, Nature.

[43]  I. Grevemeyer,et al.  Centroid depth and mechanism of trench-outer rise earthquakes , 2008 .

[44]  Stephen P. Norris,et al.  Visualizations and Visualization in Science Education , 2012 .

[45]  Charles H. Langmuir,et al.  The chemical composition of subducting sediment and its consequences for the crust and mantle , 1998 .

[46]  Kelin Wang,et al.  Common depth of slab‐mantle decoupling: Reconciling diversity and uniformity of subduction zones , 2009 .

[47]  Simon M. Peacock,et al.  Subduction factory 2. Are intermediate‐depth earthquakes in subducting slabs linked to metamorphic dehydration reactions? , 2003 .

[48]  J. Gieskes,et al.  Diagenesis of siliceous oozes—I. Chemical controls on the rate of opal-A to opal-CT transformation—an experimental study , 1977 .

[49]  Z. Sharp,et al.  Carbonate dissolution during subduction revealed by diamond-bearing rocks from the Alps , 2011 .