The OBSIP Management Office (OMO) restricted access on 2/28/2014 to the Cascadia Initiative dataset (network ID 7D) at the IRIS Data Management Center (DMC) in order to resolve a channel naming error that results in a large number of stations having an incorrect relative orientation.
The channel-naming errors affected LDEO OBS data in Year 1 and Year 2 and the SIO OBS data for Year 2. As a result of this change, OBSIP will make all of the Cascadia Initiative data consistent in relative orientation.
The relative orientation of the horizontal components for the Cascadia Stations were incorrectly defined. There are two options for the relative orientation of the horizontal channels.
Because OBSIP instruments are built and operated by three different IIC's, the usage of default relative horizontal orientation of channels varied in Year 1. In Year 2, all of the data was intended to be uploaded in the GSN convention (BH2 90° CW of BH1). The Cascadia data was corrected from both Year 1 and Year 2 so that all data follows the GSN convention (BH2 90° CW of BH1).
As of 5/2/2014, the data has been corrected and unrestricted.
UPDATED CONVENTIONS (after restriction)
PREVIOUS CONVENTIONS (prior to restriction)