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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
Title of journal: science
Series/Report no.: 5860/319 (2008)
Publisher: American Association for the Advancement of Science
Issue Date: 22-Nov-2007
DOI: 10.1126/science.1150558
Keywords: Nonvolcanic
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.
Appears in Collections:04.06.03. Earthquake source and dynamics
04.06.02. Earthquake interactions and probability
04.06.01. Earthquake faults: properties and evolution
Papers Published / Papers in press

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