Fault Slip Rates at Depth from Recurrence Intervals of Repeating Microearthquakes

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Science  30 Jul 1999:
Vol. 285, Issue 5428, pp. 718-721
DOI: 10.1126/science.285.5428.718

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Unique attributes in sequences of recurring, similar microearthquakes at Parkfield, California, provide a means for inferring slip rate at depth throughout the active fault surface from the time intervals between sequence events. Application of the method using an 11-year microseismicity record revealed systematic spatial and temporal changes in the slip rate that were synchronous with earthquake activity and other independent measures of fault-zone slip. If this phenomenon is found to be generally common behavior in active faults, it forms the basis for a method to monitor the changing strain field throughout a seismogenic fault zone.

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