Summary of triggering of non- volcanic tremor in Cascadia Justin Rubinstein.

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Presentation transcript:

Summary of triggering of non- volcanic tremor in Cascadia Justin Rubinstein

Tremor is Modulated by Love Waves

How things work * Love waves Earthquake in Alaska

Tremor Modulated by Stress Amplitude Rubinstein et al, 2007

Rubinstein et al, submitted Does Amplitude Control Triggering? Rubinstein et al, 2009

Peng et al, submitted Does Amplitude Control Triggering in Parkfield?

Peng et al, in prep Does Amplitude Control Triggering in Taiwan?

Tremor correlates with tides Shelly et al., (2007)

Recordings of 3 ETS episodes Tremor“Noise”

Tremor spectra for the 5 arrays Rubinstein et al, 2008

Amplitude variation with 12.4-hr period 12.4-hr tides 30% effect 24-hr probably similar magnitude

Summary & Conclusions Tremor is triggered by very small dynamic stresses from teleseismic EQs (10s of KPa)Tremor is triggered by very small dynamic stresses from teleseismic EQs (10s of KPa) Tremor is modulated by the very small stresses of the earth and ocean tides (~10KPa)Tremor is modulated by the very small stresses of the earth and ocean tides (~10KPa) Ambient stress ~10 5 times strongerAmbient stress ~10 5 times stronger Tremor is occurring on faults that are very close to failureTremor is occurring on faults that are very close to failure –Fluids? Low Friction? Just Close to Failure?

Triggered Tremor = ETS Tremor

Tremor vs aligned 12.4-hr bumps Array SO for 2004 PA for 2005 BS for 2007