» Fri Mar 19, 2010 8:43 pm
Andy, stop frightening me. I am in Bamenda soon. Travel to Douala, then Limbe, Bamenda and Yaounde...
More seriously, guys, don't panic about methan hydrate, they are still a lot in the sea floor, Belanos is totally right, this is a local events. Actually, when drilling a well in deep offshore, we are often suffering problem of sea bottom instability because of methan hydrates. In the case of BP, trust me, the hydrates have gone for a long time.
Talking about the eruption, you are 'lucky' in the GoM not to have H2S, hydrogen sulphide. I worked in Congo, on Tchibouela, long ago. It's a pretty nasty place, with a lot of H2S. We were forced to move sometimes with tear gas mask and oxygen bottles. We had drill test on H2S every 3 days. The unit to measure low concentration gas is ppm, part per million. Basically 10 000 ppm = 1%
With H2S, between 1-20 ppm, it's a bad smell, it burns eyes, throat and nose.
From 20 to 50 ppm, you get headache, gradually lose the sense of smell, vomit, nausea, dizziness.
50-100 ppm: serious cough, nausea, lose balance etc...
100-200 ppm : convulsions, coma after 2-5 min
Above 200 ppm: coma and death by pulmonary oedema.
In Congo, we had concentrations on the shale shakers around 80-120 ppm....