IRIS Knowledge Base

What does the M, D, R, or Q character mean in my data file name?

This is a quality control marker.

        M = Merged data, a new post-processing scheme being implemented at IRIS DMC to present clean data traces from multiple pieces of data.

        Q = Data tagged as Quality Controlled by the network operator

        D = Data of indeterminate quality – this is a legacy tag for older data

        R = Raw Data as a result of real-time telemetry to the DMC

        For more details about the markers and how you can customize your data requests, please view this DMC newsletter article:
        [ http://www.iris.edu/news/newsletter/vol4no2/page1.htm ]

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