On 11/15/2011 11:14 AM, Randall Pratt wrote:
>
> Two quakes in 2 days here in SD.  I find from the state web site that 
> there is some drilling mainly west of the area but didn't see anything 
> close enough to associate as a cause.  If there is an oil or gas well 
> it would be new this year I think.   I have never been in that area 
> personally.
>
> Randy
>
Not been following SD earthquakes but this is my experience with AR and 
OK; look at the sight 
http://folkworm.ceri.memphis.edu/recenteqs/Quakes/quakes0.html, this 
individual rates the quality of quake recorded. If it is rated "fair" 
and at depths of 3 to 7 km,  in most cases, you will be able to find a 
drilling sight within 2000 ft of the quake's epicenter ..... even the 
ones in Virginia. Most State geologic depts have GIS positioning on 
drilling permits. Some make it harder than others to find the data but 
it exists.

  
    
  
  
    On 11/15/2011 11:14 AM, Randall Pratt wrote:
    

      
      
      
      

        
Two quakes in 2 days here in SD.  I
              find from the state
              web site that there is some drilling mainly west of the
              area but didn’t
              see anything close enough to associate as a cause.  If
              there is an oil or
              gas well it would be new this year I think.   I have never
              been in
              that area personally. 
        
 
        
Randy
        
 
      
    
    Not been following SD earthquakes but this is my experience with AR
    and OK; look at the sight http://folkworm.ceri.memphis.edu/recenteqs/Quakes/quakes0.html,
    this individual rates the quality of quake recorded. If it is rated
    "fair" and at depths of 3 to 7 km,  in most cases, you will be able
    to find a drilling sight within 2000 ft of the quake's epicenter
    ..... even the ones in Virginia. Most State geologic depts have GIS
    positioning on drilling permits. Some make it harder than others to
    find the data but it exists.