Well today has been mostly quiet, until about 17:00 UTC
Where as you can see we started to get the signals that might indicate things moving in the sinkhole.
When you start looking at the helicorders and are trying to make sense from them, the first rule is to compare the times you think something happened,
to another (several) sensor in the region.
If you pop them out in separate windows it will help you to compare the two helicorder graphs.
Looking at both, you can quickly rule out anything that isn't important, if it shows on one, but not on the others, it wasn't worth paying attention
to. If a similar signal is at the same time, or with in 15-30 seconds of it on another graph, less in the Bayou Corne area; you might have something
to consider. Once you suspect something has happened, the next trick is to look further away. In the above at 19:40 on wards we likely have a signal
that may indicate movement.
As it is visible in more than one graph, and only with a slight difference in start times.
So now we jot down the time and look on the USGS map for any events that may have happened in the past 30-20 minutes. We do this because the Earth
transmits or echoes the quakes outward from point of origin, and the larger the quake adds in it's own headaches to the signals interpreted; as the
echoes reflect off the core and the mantle too.
Looking at the list of quakes, the Russian Quake Quake
Might have enough of a thump to it to be registered at LA 12, the travel time for the signal is a bit long though. So its maybe a bit of a coin toss
as to if that is what is showing on LA 12.
There was also a quake of 2.7 in the British Islands, that happened nearly at the same time of our mystery signals.
Which might account for some of the signal, but the distance traveled and the strength of it, might not be enough to make a good signal. Also given
that the signal in LA12 that we are looking at does not have typical small sharp attack and fade of a earthquake the signal there isn't likely from
the British Islands quake.
Then we have to consider in the time of day, we know that there are berm building, and testing the area; traffic, etc will also show up on the sensors
too. The time of day suggests that it could be cultural noise.
Then there is weather.
Wind moves the trees, and that creates a vibration signal too.
Current Wind: from the Northwest at 16.1 gusting to 21.9 MPH (14 gusting to 19 KT)
Most of the time, wind/weather noise looks like static on the helicorder plots.
Rain is really noisy and thunder will peg the signals if lightning strikes near a sensor too.
One last telling bit, is to look at the length of the signals an if there are signals that look similar and share the length.
Looking at the graphs of 12 & 11, I see events of similar duration that have happened today as well.
Since the signals are pretty much even and 3 minutes long when they happened, its a safe bet that it was man made.
EG More testing.
It seems like a lot of work, but it takes much longer to write it all down & put links to it than it really takes to sort out an important signal from
one that isn't. The key is to practice.
Fortunately there are no huge herds of bison, like the ones in Yellowstone; which -really- can confuse things.
edit on 25-3-2013 by Moshpet because: Readability.