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In this lab, students map extensional crack arrays, at full-scale, using long pieces of inexpensive craft paper and markers. I had previously tried this lab having students draw at a reduced-scale in their field notebooks; they seemed to focus on dealing with the scale factor, rather than recognizing patterns. Mapping at full scale obviates this problem. Students then highlight or color segments of their maps to emphasize the patterns they recognize; e.g., zones of right-stepping cracks; zones of left-stepping cracks; relay ramp crack connections, strike-slip fault connections, etc. Students work in groups of two. In addition to the maps, I ask them to draw one cross-section and to think about and talk about the underlying kinematics and dynamics. We then lay out all of the maps on the ground, then walk through and discuss them group-by-group. Each group talks the class through the descriptive, kinematic, and dynamic (sometimes speculative) aspects of their "study area".
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