sp value of advent, page-14

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    there is a good read on 'another' share site detailing the minutes of a recent council meeting with breeze and co. and the council. This particular blurb caught my attention;

    "Gas illustrated by shelf failure features caused by gas and illustrated by pockmarks. Largest of which is 700 x 70 m deep so massive fluid flow features, and pockmark illustrated is biggest in the world."

    Additonal reading from wikapedia on pockmarks;
    Pockmarks are craters in the seabed caused by fluids (gas and liquids) erupting and straming through the sediments. These craters were first discovered off the coasts of Nova Scotia, Canada in the late 1960's by Lew King and Brian McLean of Bedford Institute of Oceanography. They published their discoveries in 1970. Because craters are very uncommon on the land surface, they were not expecting to find craters on the seafloor. However, when they launched the new type of acoustic instrument, the Side Scan Sonar, fist developed in the late 1960's by Kelvin Hughes in UK,off Nova Scotia, they were amazed to see numerous craters in the seafloor muds.
    The craters off Nova Scotia are up to 150 m in diameter and 10 m deep. But today, these types of craters, pockmarks, have been found all over the world, and have been described in more detail in books by Alan Judd and Martin Hovland (Cambridge, 2007), and in numerous scientific articles. Nowadays, the increasing use of hig-resolution multibeam acoustic systems for bathymetric mapping has led to pockmarks being recognised worldwide. The occurrence of pockmarks in hydrocarbon-prone areas has led several authors to suggest a close link between seepages forming the craters and a petroleum system. In these cases, pockmarks have been interpreted as the morphological expression of gas or oil leakage from active hydrocarbon system or a deeper overpressured reservoir.
 
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