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Master of Science (MS)
Roman, Diana Christine, 1976-
Housen, Bernard Arthur
In seismology, multiplets are a series of earthquakes with similar waveforms that are thought to represent a repeating process occurring at the same location. A few studies have previously identified multiplets with waveforms that are inverted relative to one another; here termed inverted multiplets (IMs).For this study, several data sets were searched for additional examples of IMs, including earthquake swarms associated with a volcanic eruption (Mt. Spurr), a dike intrusion (Nechako Basin), dome building (Mt. St. Helens), and times of no volcanic or magmatic activity (Piton de la Fournaise [PDLF], Mt. Spurr). Source mechanisms are determined to describe what could possibly cause this phenomenon. The results suggest there are many ways to produce an IM, but that most of the viable mechanisms relate to dike intrusion. The existence of IMs in a region could be an indicator of a dike intrusion and lead to a greater understanding of subsurface processes.
Western Washington University
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Brann, Joel, "Mechanisms of Inverted Seismic Multiplets" (2016). WWU Graduate School Collection. 516.