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The images you attached for WHAR and WLAR look like small earthquakes. I am not sure what the signal is on HHAR. Please let me know if you see it again. The noise on WLAR on 3/7 looks like somebody doing work around the station. If you are not already signed up, you may want to consider signing up for the earthquake notification service, sslearthquake.usgs.gov... a service that will alert you to earthquake activity in your area. But please keep in mind that we have limited resources and may not have time to quickly process events of magnitude less than 2.
I hope this information is helpful.
On 3/8/11 2:07 PM, wrote:
Thank you so much for taking the time to look into this and respond. As to whether I was referring to the P waves showing up from the 6.6 quake at about 1900 CST, no those are not what I was looking at. I apologize for not being more specific. I am quite familiar with distant P waves (although they still get me excited every once in awhile). I took some screen shots of some of the stations (which show the GEE stations and times), so I will attach those to this email. Also, this following link will take you to an Arkansas helicorder which corresponds with one of the attachments (HHAR 2nd/3rd attachments) and clearly shows the signal: (starts at about 18:35UTC)
Also, if you go to the following link and look at the past couple of days for Hobbs and White Oak Lake:
Specifically this one:
folkworm.ceri.memphis.edu... (starting at about 15:15 UTC)
Some aquintances of mine have ran some spectograms and sound analysis on a few of these. It is by far very bizarre sounding. While there does not seem to be Harmonic tremors, (frequency is way too high) there are some harmonics of unknown origin.
I hope this helps, and also to let you know that residents about 15 miles west of Beebe are still feeling ground motion and even the very micro quakes.
Date: Tue, 8 Mar 2011 13:34:40 -0600
Subject: Re: EHP Website Email - Arkansas area quakes
The network people here at the Center for Earthquake Research and Information at the University of Memphis, who look at far more seismic signals than I do, have informed be that the harmonic signals that you see are surface waves from earthquakes fairly far away, likely the M6.6 that occurred in the Solomon Islands (earthquake.usgs.gov...), assuming we’re looking at the same signals. Are the signals that you’re referring to those that are occurring around 19:00 CST in the following image?
On 3/7/11 5:11 PM,
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Hi there. I have some questions regarding several stations that I have been monitoring on GEE in Arkansas. The stations are AG.WHAR (center of the current swarm) AG.HHAR (Hobbs) and AG.WLAR (White Oak Lake) I am concerned about the recent (past day or so) activity being picked up on HHAR and WLAR. It is bizzarre, to say the least and at times almost looking similar to Harmonic Tremors. I just noticed that the most recent quake (2.7 centered near Greenbriar) actually showed up strongest on the HHAR station to the NW than it did on WHAR. I am have been in communication with a resident living just West of Bebee (SW of the swarm) who is feeling almost constant ground movement (she has video to confirm) and feels even the most micro of quakes...reporting them felt even before it shows up on GEE. I think that having those two injection wells stopped was a great step, but not the actual problem. I can't imagine that the USGS is not aware of the current activity occuring on all of these stations, as well as what is being felt on the ground. It would seem that something potentially major is brewing and I am very alarmed at the lack of ANY media coverage or communication between the USGS and local residents. Can you in any way tell me what is going on with these stations? Are you aware of this? Thank you very much for your time and consideration,
Originally posted by justsaying
reply to post by ButterCookie
It seems as if the Memphis area is seriously taking note of the events in Arkansas. I will have to ask my teens if their school has had any earthquake prep activity, previous to last week they haven't had any.But I am consistently seeing the commercial for the Shake Out drill on local tv, and there have been quite a few people sign up for that. Right now I am trying to find a route to get me from my home and across the Loosahatchie river so I can get to Memphis area hospitals without crossing a disabled bridge (that's if the Mississippi river hasn't flooded me out to the Gulf of Mexico!!). I may have to head north to Covington instead, but Memphis would have a greater need so I am trying to find a route in to the city.
The images you attached for WHAR and WLAR ---look like---- small earthquakes.
I am ---- not sure --- what the signal is on HHAR.
Please let me know if you see it again.?????
The noise on WLAR on 3/7 ---- looks like ----- somebody doing work around the station.
If you are not already signed up, you may want to consider signing up for the earthquake notification service, sslearthquake.usgs.gov... a service that will alert you to earthquake activity in your area. ---- Your kidding me right ---
But please keep in mind that --- we have limited resources--- and -----may not have time---- to quickly process events of magnitude less than 2.