![]() previously deformed or compositionally disparate) crust fit a distributed deformation pattern that results in widening of the fault zone, fracture deflection, and regional strain accommodation across many faults exhibiting small or no lateral offsets (as opposed to a single throughgoing fault), and (2) the process of cyclic bidirectional horizontal shearing results in strike-slip fault morphologies that resemble commonly observed features on the surfaces of tidally deformed objects that are not observed elsewhere in the solar system in association with strike-slip faulting. Using experimental analogues I show that (1) strike-slip faults that initiate in structurally heterogeneous (i.e. Instead, I propose that the sequence, geometry, and morphology of strike-slip faults are highly dependent on the tectonic environment in which they were formed. However, along-strike variations in morphology and lateral offsets, pervasive off-fault deformation, and the absence of throughgoing faults do not adhere to anticipated outcomes of traditional strike-slip fault formation models. Strike-slip fault zones are defined as having a primary throughgoing fault that accommodates the majority of regional strain and flanking offset folds and fractures that form at characteristic angles away from the applied stress direction. The current understanding for strike-slip fault initiation, geometry, and morphology, derived from field and experimental studies in homogenous material by unidirectional simple shear, suggests a sequence of deformation variable only by the shape of an underlying fault. The geometry and morphology of strike-slip faults can be used to test competing models of structural deformation and geodynamic properties of solar system bodies. In this work, I integrate geologic observations and interpretations with experimental analogues to investigate the tectonic development of strike-slip faults in response to (1) pre-existing heterogeneous crust structure and/or composition, and (2) cyclic “tidal” stresses. Strike-slip faults are widespread across tectonic environments and their geometry, morphology, and kinematics are easily identifiable through remote sensing techniques, making this class of structures ideal for reconstructing the histories of planetary crusts. ![]() To provide insight into these processes, my research focuses on strike-slip fault formation on Earth, Venus, and tidally deformed satellites (e.g., Europa, Enceladus, Phobos). Furthermore, the kinematics and mechanisms of faulting provide a framework for understanding the range of dynamic processes that operate (or have previously operated) on planetary surfaces. ![]() ![]() Videos - Concise video lectures give background information on the Earth and plate tectonics for teaching how earthquakes happen and how they are studied.Identifying the ways in which faults initiate and propagate in disparate tectonic environments is fundamental for understanding regional and global deformation on rocky and icy bodies throughout the solar system. Software-Web-Apps - Stand alone software, interactive web tools, and downloadable apps to help you explore seismic data and earthquake topics. Posters - More than just wallpaper, these eye-catching, educative posters invite students to become minds-on with Earth's internal structure, earthquakes, seismic waves and more! Lessons - A step-by-step guide outlining what students will learn across one or more class periods, through a progression of activities, combined in a learning cycle, to achieve the desired student learning. Interactives - Uses interactive Flash (sfw) to illustrate fundamental concepts that are difficult to convey to learners through other means. IRIS offers a range of resources for students, educators and the general public.Īctivities - Bite-sized (5, 15, or 30 minute) demonstrations or student tasks tied to ‘Did You Know?’ questions to engage the learner.Īnimations - Concise animations that illustrate fundamental concepts that are difficult to convey to learners through other means (the real events may be too small, too large, too fast, too slow, or unsafe for the classroom).Ĭourse - A series of lessons that provide the structure for a semester-long undergraduate course.ĭemos - Quick teacher-lead activities (show-and-tell combined with an opportunity for learners to ponder, predict and discuss) to stimulate interest and convey a concept to learners.įact-Sheets- Single page, accessible, discussions of earthquake related topics. ![]()
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