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Authors: Rubinstein, J. L.* 
La Rocca, M.* 
Vidale, J. E.* 
Creager, K. C.* 
Wech, A. G.* 
Title: Tidal Modulation of Nonvolcanic Tremor
Issue Date: 22-Nov-2007
Series/Report no.: 5860/319 (2008)
DOI: 10.1126/science.1150558
Keywords: Nonvolcanic
Subject Classification04. Solid Earth::04.06. Seismology::04.06.01. Earthquake faults: properties and evolution 
04. Solid Earth::04.06. Seismology::04.06.02. Earthquake interactions and probability 
04. Solid Earth::04.06. Seismology::04.06.03. Earthquake source and dynamics 
Abstract: Episodes of nonvolcanic tremor and accompanying slow slip recently have been observed in the subduction zones of Japan and Cascadia. In Cascadia, such episodes typically last a few weeks, and differ from “normal” earthquakes in their source location and momentduration scaling. The three most recent episodes in the Puget Sound/Southern Vancouver Island portion of the Cascadia subduction zone have been exceptionally well recorded. In each episode, we see clear pulsing of tremor activity with periods of 12.4 and 24-25 hours, the same as the principal lunar and lunisolar tides. This indicates that the small stresses associated with the solid-earth and ocean tides influence the genesis of tremor much more effectively than they do “normal” earthquakes. Because the lithostatic stresses are 105 times larger than those associated with the tides, we argue that tremor occurs on very weak faults.
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