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

UPDATE: All data accessed form the IRIS DMC is now delivered as ‘M’ quality data.



Updated: 03/06/2019
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