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Size distribution of Parkfield’s microearthquakes reflects changes in surface creep rate

Geophysical Journal International

By:
, , , , and
DOI: 10.1093/gji/ggt093

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Abstract

The nucleation area of the series of M6 events in Parkfield has been shown to be characterized by low b-values throughout the seismic cycle. Since low b-values represent high differential stresses, the asperity structure seems to be always stably stressed and even unaffected by the latest main shock in 2004. However, because fault loading rates and applied shear stress vary with time, some degree of temporal variability of the b-value within stable blocks is to be expected. We discuss in this study adequate techniques and uncertainty treatment for a detailed analysis of the temporal evolution of b-values. We show that the derived signal for the Parkfield asperity correlates with changes in surface creep, suggesting a sensitive time resolution of the b-value stress meter, and confirming near-critical loading conditions within the Parkfield asperity.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Size distribution of Parkfield’s microearthquakes reflects changes in surface creep rate
Series title:
Geophysical Journal International
DOI:
10.1093/gji/ggt093
Volume
193
Issue:
3
Year Published:
2013
Language:
English
Publisher:
Royal Astronomical Society
Contributing office(s):
Earthquake Science Center
Description:
5 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Geophysical Journal International
First page:
1474
Last page:
1478
Number of Pages:
5