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Figure 1-7. Spectrograms of a local (upper) and a teleseismic event (bottom) recorded by WTX. The vertical axis is labeled by
normalized frequency (0 to 50 Hz).
Besides natural earthquakes, manmade seismic events (e.g., mining explosions) are often
recorded by the SC network. Four major regions where routine mining blasting occurs are
Morenci (southeastern corner of Arizona; cyan point in Figure 1-4), Tyrone (southwest corner
of New Mexico), Santa-Rita (to the east of Tyrone) and Mt. Taylor (to the northwest of
Albuquerque). Repeated earthquakes have often been observed around the station DAG since
2003, and they are likely induced seismic events ([2]).
Characteristic Waveform Patterns of different source regions
When waveforms from different source regions are recorded at a signal station, they show
different patterns or signatures due to differing Green’s functions associated with their
propagation paths. Generally, waveforms that come from the same source region share
similar characteristics. In the following, I will describe the characteristic waveform
characteristics for seismograms from different source regions by comparing waveforms
recorded at station LEM.
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