Frequently Answered Question

Question

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

Answer

This is a quality control marker.

Marker Definition
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

NOTE: All data accessed from the IRIS DMC SEED archive is now delivered as ‘M’ quality data.
All experiment data accessed from the PH5 archive is delivered as ‘D’ quality data.



Updated: 10/01/2019
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