Uplift rates associated with 12 episodic tremor and slip events on the Cascadia Subduction Zone occurring between 1997 and 2010 have been determined from hourly water level records from 4 NOAA tide gauges (Neah Bay, Port Angeles, Port Townsend, and Seattle). Displacements inferred from water levels generally agree with displacements inferred from modeling GPS data. Examination of uplift between events shows an inter-event deformation rate approximately equal in magnitude, with ETS events, on average, releasing strain accumulated between events, suggesting that ETS is consistent with the elastic rebound theory. Additionally, while the GPS record only extends to the late 1990s and the tremor record includes only recent decades for Cascadia, tidal records in the Pacific Northwest and around the world span many decades. Thus, by showing that ETS can be resolved in tidal records we open up the possibility that tidal records could be used to study ETS where other tools are not available.
This thesis contains unpublished coauthored material.
|Advisor:||Weldon, Ray J.|
|School:||University of Oregon|
|Department:||Department of Geological Sciences|
|School Location:||United States -- Oregon|
|Source:||MAI 50/04M, Masters Abstracts International|
|Keywords:||Cascadia, Episodic tremor and slip events, Tide gauges|
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