The most likely signature of such a methane eruption would be a sudden decrease in the ratio of carbon-13 to carbon-12 in sediments, since methane clathrates are low in carbon-13; but the change would have to be very large, as other events can also reduce the percentage of carbon-13.
A sinatura mías probable que indica que se produciu no pasado unha erupción de metano é un rápido descenso da proporción de carbono-13 / carbono-12 nos sedimentos, xa que os clatratos de metano son baixos en carbono-13; pero este cambio tería que ser moi grande, xa que hai outros acontecementos que poden tamén reducir a porcentaxe de carbono-13.