Special Notes for Yellowstone Park
Monitoring Yellowstone Park has become a pastime for many of us, since it is one of the most active areas in the Unites States.
So here are some more notes useful for watching this park particularly.
Networks to Watch
The seismic networks that you can add in GEE that are positioned in and around the park are:
WY- Yellowstone Wyoming Seismic Network
- Extremely Short Period
For a map/list of stations see:
This network requires you to select "Extremely Short Period" FIRST before adding the network if you want to see them light up in blue for real time
viewer loading. This network is usually available, but lately has not been available in GEE.
Note that this network displays in nanometers (nm). NOT nm/sec. The difference being the first is actual ground displacement, and the second (nm/sec)
is how fast that displacement occurred using what are known as accelerometers. You will see this second type of display on other networks like the PB
For this network (WY), most stations will saturate out at either 300 or 600 nanometers when a larger quake (above 2.0 Magnitude) occurs. You will see
that the waveforms get cut off when that happens. These are generally used to monitor microquakes, and may be very useful in the event a harmonic
tremor occurred somewhere in the park. As of now, no one here has ever seen a harmonic tremor on any webicorder graph at Yellowstone. If you believe
you have found one, please post it for review.
PB- Plate Boundary Observatory
- Extremely Short Period
PB.B207- nearest the January-Feb Western Caldera swarm
Here are specific instructions for adding this network which you can use as well for any other networks that won't come up as broadband:
1) Edit>station chooser, while displaying the map.
2) Add network
3) While you wait for networks to come up, select vertical only and "extremely short period"
4) When networks load, add network PB. (Plate Boundary Observatory)
5) Scroll down and find PB.B207 in the list, and it should be lit up in blue, showing you have the right channel selections for that station.
6) Simply select it in the list to light it up on the map, as well as any others nearby, and then Load Real Time Data.
See above notes under WY for how this network displays in nm/sec. Note that these stations on this network will not saturate out so quickly like the
other Extremely Short Period stations. Exactly where their saturation point is is unclear, but so far they have handled everything I've seen up to
3.2- and that's real close to the quake.
To see webicorder graphs of all stations in this network, here is a very useful link:
IW- Intermountain West
This like other broadband networks displays in nm and microns per second.
The next step up in case of real large quakes close to the station would be millimeters/sec. and CM per sec. after that. Broadband accelerometer
networks can generally handle the bigger quakes without much problems, and some are rated to be able to display magnitudes up to 10.
TA- Transportable Array
Zoom to Yellowstone to see the stations in the area
Other stations in this network to the east of Yellowstone are useful for picking up mine blasts coming from Gillette, WY. Some of these (the bigger
ones) can be picked up at Yellowstone, and continually cause confusion because they can look quite like harmonic tremors. Watch out during daytime
There are a couple of other networks, but generally these will cover most of Yellowstone Park, and will usually be available in GEE. Sometimes they
are not. Sometimes they go down. Sometimes one station goes down. Some networks are not accessible to GEE no matter what channels you try.
Estimating Magnitude in GEE at Yellowstone
For the current Western Caldera swarm (Jan-Feb 2010), station PB.B207, close to the quakes registered around 27 microns/sec on the Vertical EHZ
channel alone for an early 3.1 mag quake. I did not see the EH1 and EH2 channels for that one.
If you are also going to monitor EH1 and EH2 channels, another 3.1 quake registered around 14 microns/sec on the EHZ channel, but near 50 microns/sec
on the EH1 channel.
Remember to take into account distance to the epicenter, but of course since you will get these in GEE before the USGS publishes them, and then
revises them, you do not know where they are coming from unless it's obvious that PB.B207 is registering them soonest. Then it's likely they are
coming from the swarm location.
After a while of seeing them in GEE, and then seeing what the USGS says from Equake alert or alternatively this RSS feed (what Equake alert uses to
you will get a sense of roughly what magnitude a given spike generates. Just beware of all the possibilities, locations, times on the RTV, and more.
As if all that wasn't enough to worry about, also bear in mind that at Yellowstone a lot of different things can happen. Like the forming of new mud
volcanoes which can shake the earth violently. Or a hydrothermal explosion which can destroy geysers.
A very interesting read here on previous events at Yellowstone, which can affect your GEE readings:
[edit on Tue Feb 2nd 2010 by TrueAmerican]