GEOLOGICAL SURVEY OF IRAN | WWW.GSI.IR
 
فارسی  |     
Home |  Contact Us |  Help 
>
Sciences - Geomatics > Airborne Geophysic

 

  Increased accuracy of geophysical surveys, together with an increased probability of weak-contrasting targets reflected in measurements results, leads to an abrupt growth in the quantity of detected weak, local geophysical anomalies which, taken together, form natural background variations of the measured field - the so-called "geonoise". In this case, the probability of any detected anomaly belonging to a pre-set exploration target goes down significantly. A coincidence in the distribution of anomaly and noise parameters is sometimes detected not only due to signal amplitude, but due to the radius of its autocorrelation [1] as well. This makes it impossible to adequately separate useful anomalies from noise at the interpretation stage and leads to either considerable spending on exploring other anomalies by other exploration means (drilling among them) or numerous misses of exploration targets.