Gillian Sharer staff Oct. 10, 2013, 10:15 a.m.
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 filter option set when requesting 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.