Comment on 'Aseismic slip and fault-normal strain along creeping section of the San Andreas Fault' by F. Rolandone et al.

摘要

Rolandone et at [2008] report estimates of the strain rate adjacent to the creeping segment of the San Andreas Fault in central California. Some of their strain-rate esti-mates are based on monument velocities inferred from short runs of data (e. g., 2003.4-2004.8) that include coseismic corrections for the 2003.975 San Simeon and 2004.744 Parkfield earthquakes. This comment uses only the longer runs of their data for an alternative analysis that leads to strain rate estimates significantly closer to zero than they propose. In this comment tensor, not engineering, strain is used, extension is reckoned positive, and the uncertainties quoted in the text and table are standard deviations.