Hi Tom - thanks for the question. There are competing ways of displaying polarity, generally referred to as "American" and "European" ... in practice, opposite to each other. But actually a greater issue is the choice of colour bar issued to display the image... so rules like "blue = hard kick" is not reliable, regardless of the origin of the image. So a good check with marine data is to look at the seabed - which should of course reflect a positive impedance contrast (as sediment/rock have higher velocities than seawater). For onshore data this is much tougher... For more (technical) info - check out SEGwiki.... as a good starting point....
![ฉันจะ "แพรี่" ให้หมด - ผู้แข็งแกร่งที่สุดในโลกอยากจะเป็นนักผจญภัยให้ได้ - ตอนที่ 04 [ซับไทย]](http://i.ytimg.com/vi/PvmuP8y9IPk/mqdefault.jpg)
This was really helpful. Thank you
Awesome explanation.
thanks - glad you found it useful!
how could you check for 'Normal polarity' for sea-bed relectors for eurropean polarity conventions ? Thank you :)
Hi Tom - thanks for the question. There are competing ways of displaying polarity, generally referred to as "American" and "European" ... in practice, opposite to each other. But actually a greater issue is the choice of colour bar issued to display the image... so rules like "blue = hard kick" is not reliable, regardless of the origin of the image. So a good check with marine data is to look at the seabed - which should of course reflect a positive impedance contrast (as sediment/rock have higher velocities than seawater). For onshore data this is much tougher... For more (technical) info - check out SEGwiki.... as a good starting point....
7:18 Is it possible to identify more than one reactivation phases of a fault from a seismic profile?
Yes - if the growth strata are resolvable...