IRIS Knowledge Base

USArray TA stations have several seismic channels available with different sample rates. The BH[ENZ] channels are 40 samples per second (sps or hz) and the LH[ENZ] channels are 1 sps. Some stations also have UH[ENZ] channels (0.01 sps) and VH[ENZ] channels (0.1 sps) available. If you want a different sample rate you can use the IRIS timeseries webservice with the decimate option to request data. When using the webservice, the sample-rate of the source divided by the given sample-rate must be factorable by 2, 3, 4, or 7. For example, if the requested channel has a native 40 sps rate, a decimated sample rate of 10 sps (40/10 = 10, factorable by 2) or 0.5 sps (40/0.5 = 80, factorable by 2 or 4) would be valid options.