A tremor source on the San Andreas Fault produced an unusual sequence of low-frequency earthquakes until it was disrupted by the 2004 Parkfield earthquake; the peculiar recurrence pattern has now been modelled, showing that such slip behaviour occurs when the tremor asperity size is close to the critical nucleation size of earthquakes.
Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/parkfield-tremors-reveal-slow-and-fast-ruptures-same-asperity
[2] http://admin.indiaenvironmentportal.org.in/category/author/deepa-mele-veedu
[3] http://admin.indiaenvironmentportal.org.in/category/author/sylvain-barbot
[4] http://admin.indiaenvironmentportal.org.in/category/journal/nature
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/earthquakes
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/geology
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/natural-disasters
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/united-states-america-us