Model for triggering of non-volcanic tremor by earthquakes

Details Model for triggering of non-volcanic tremor by earthquakes Model for triggering of non-volcanic tremor by earthquakes

2012-02-04

arxiv.org/abs/1202.0912v1

Physics

Geophysics

9 pages, 1 figure

Scientific paper

There is evidence of tremor triggering by seismic waves emanating from distant large earthquakes. The frequency content of both triggered and ambient tremor are largely identical, suggesting that this property does not depend directly on the nature of the source. We show here that the model of plate dynamics developed earlier by us is an appropriate tool for describing tremor triggering. In the framework of this model, tremor is an internal response of a fault to a failure triggered by external disturbances. The model predicts generation of radiation in a frequency range defined by the fault parameters. Thus, although the amplitude and duration of a tremor burst may reflect the "personality" of the source, the frequency content does not. The model also explains why a tremor has no clear impulsive phase, in contrast to earthquakes. The relationship between tremor and low frequency earthquakes is discussed.

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