TO: FDSN members and network operators
RE: Census of legacy Quanterra dataloggers
A technical issue related to internal epochal time in certain
earlier-generation Quanterra data acquisition systems has been identified.
The issue will first express itself on December 31, 2017, when the epochal
time will cause these systems to cease operating. A second issue, related
to GPS time, would express itself in April 2019.
Affected systems are the following: Q380, Q680, Q4120, Q730.
Owing to the a…