Sister Faults in California could Aggravate Other Faults Around the Globe

September 28th, 2011-
The San Andreas, Calaveras, and Hayward fault lines -which run underneath Silicon Valley – could set off tremors and aftershocks globally, according to a new study.
Researchers at UC Berkeley and the U.S. Geological Survey found that fault lines of the “strike-slip” type, where plates of land slide past each other, were more likely to set off the worldwide aftershocks.
As an example, the researchers found the 8.6 earthquake in Indonesia this April set off 16 earthquakes with a magnitude of 5.5 or greater within days.
Not only could these “strike slip” faults like the San Andreas, Calaveras, and Hayward faults set off worldwide aftershocks, but the researchers indicate the faults could also be set off if another earthquake’s tremors struck when the fault was ready to rupture.
However, the study indicates a quake powerful enough to do that only happens once every 50 years or so.



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