At the current early stage, when only about 5 per cent of the seabed has been systematically explored, about 100 such sites have been found, mostly associated with volcanic island chains that border the western margin of the Pacific Ocean.
在现今初期阶段，系统地勘探过的海床只有大约5％，但已发现约有100个这种地点，大部分与接近太平洋西部边缘的火山岛链有关。