reply to post by berkeleygal
Hi berkeleygal and Happy Friday! (It's after 3 pm here...

)
Those two stations... The first one (GCVB -- Cloverdale) is not just blank (but yeah, it
is blank), it looks like it's simply not running at
all. You see this sometimes. Could be it got knocked out of whack back on Jan 10 and they haven't had a techie out there to fix it yet. Or it could
be just a failure in the data feed. We see this sort of thing quite a lot with the Yellowstone webicorders. They go off line, they come back on line,
go off line again...
EDIT: Actually if you check out the TAKO, TOLO and HEBO webi stations, they all went offline after that big jolt yesterday. These machines are
delicate and a fair-sized quake can knock them out. (Link further below in this post for anyone who wants to take a look at them.) [End of edit.]
As for the other one (KCT -- CapeTown), if it's a bit windy round there, that could be enough to mess it up. (Again, we see these "Jackson Pollock"
type pages on some webicorders in Yellowstone when the wind is up. Strong winds can cause minor amounts of ground movement and the machines pick it
up.) Trouble is, the wind can disguise any actual seismic traces and make them hard to pick out.
That KCT is right on the coast, according to their map. What's the wind direction there at this time of day as a rule? If it's blowing on-shore then
that could be the main factor. If the wind drops off and the trace quietens down then you can be fairly certain that wind was the culprit and it
wasn't that the region went wild with seismic activity. Several of the other webis show a similarly messy trace, especially KBO, KEB and KMPB, and
those three are all near-coastal. However, KHBB (for example), which a bit further inland from them, shows a cleaner trace.
Actually, if you look at
KHBB right now, the trace is a bit creepy as
they look like harmonics. So do some of the others, actually. That doesn't mean they
are harmonics, though. But it's suggestive of them.
For anyone who's interested, here's a
link to the NTHMP drum recorder main
page. You can select the various webicorders from there and see what they're picking up. To choose different dates, go to
this page to select a date and a station that you're interested in.
Mike
[edit on 5/2/10 by JustMike]