Seismic waveforms carry much information about the source that generated them and the material properties of the media through which they propagated. Systematic changes in waveform character offer clues that can help us understand earthquake rupture processes as well as heterogeneous velocity structure. To find these systematic changes, record sections are often constructed. However, the character of the waveforms normally changes as a function of many variables, including epicentral distance, azimuth, exit point on the focal sphere, and recording station site effects, among others, all acting simultaneously. It is therefore useful to view the waveforms in their geographic/geologic context. Recognizing...

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