Arie,

The different channels all come from the same sensor. The only difference
is the sample rate and low-pass filter point. The BH* channels are normally
sampled at 20 or 40 SPS and the LH* channels at 1 SPS. There is also a VH*
channel with a sample rate of .1 SPS. On my Broadband request system I
receive this channel but throw away the data since is not very useful for
earthquake monitoring.

-Larry Cochrane
Redwood City, PSN

At 01:18 PM 5/18/00 +0800, you wrote:
>Hi, Just a small question, does anyone know what are the
>frequency ranges
>when referring to Broardband or Long period seismographs. My
>guess is
>the BH* channels are  1 hz - to 20 hz ?????
>
>BHZ, BHE, BHN   - Broardband
>LHZ, LHE, LHZ    - Long Period
>
>By the way is there any other designations?
>
>Thanks  Arie
>
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