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Date Permissions Signed


Date of Award

Summer 2016

Document Type

Masters Thesis

Degree Name

Master of Science (MS)



First Advisor

Caplan-Auerbach, Jacqueline

Second Advisor

Roman, Diana Christine, 1976-

Third Advisor

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.




Dikes (Geology), Earthquake swarms, Inversion (Geophysics)


Western Washington University

OCLC Number



masters theses




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