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Shaji Nair Earthscope Seminar, January 2007

Episodic Tremor and Slip on the Cascadia Subduction Zone: The Chatter of Silent Slip Garry Rogers and Herb Dragert, Science 300, 1942-1943. Shaji Nair Earthscope Seminar, January 2007. Motivation: Creep at depth. Press and Seiver. P. Fluech et al., 1997.

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Shaji Nair Earthscope Seminar, January 2007

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  1. Episodic Tremor and Slip on the Cascadia Subduction Zone: The Chatter of Silent SlipGarry Rogers and Herb Dragert, Science 300, 1942-1943 Shaji Nair Earthscope Seminar, January 2007

  2. Motivation: Creep at depth Press and Seiver P. Fluech et al., 1997

  3. Data:Surface Deformation and Seismic data Roger and Gragert, 2003

  4. Method: • Duration and timing of slip estimated by cross-correlation of E-W component of GPS data with an average slip time series. • Seismic data for corresponding times checked to late tremors associated with slip.

  5. Results Roger and Gragert, 2003

  6. Results: • Sustained tremor activity on southern Vancouver Island coincides with the occurrence of slip. • No substantial activity found outside the time window of slip events.

  7. Implications: • Fluids from the subducting slab may be contributing to the ETS events. • The tremor like seismic events can be used as an indicator of the occurrence of slip. • Onset of ETS events could be indicative of higher stress increasing probability of megathrust earthquakes.

  8. Additional Thoughts: • Does ETS events differ from dehydration of subducting slabs? • If observation of slip from geodetic data is unavailable,is it possible to locate these seismic tremors? • What could be other possible sources of the episodic tremors if not fluids?

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