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HMRG Deep
The HMRG (Hawaii Mapping Research Group) Deep was discovered in 1997〔〔 by a team of scientists from Hawaii.〔 Its depth (10,732 meters〔) is thought to be second or third〔Accurate measurement of depth of extremely deep areas are hard to obtain due to technical limitations. The actual depth of the HMRG Deep could potentially be greater than the Challenger Deep's: "The development of a frontal apron of forearc debris has infilled the trench to some extent, thus the actual point of contact between the outer edge of the forearc basement and the top of the subducting slab may be hundreds of meters deeper than bathymetry indicates." — Fryer et. al, ''Why is the Challenger Deep So Deep?''〕 only to the Challenger Deep and possibly Horizon Deep, currently the deepest known places in the ocean. It lies along the Mariana Trench, 200 kilometers to the east of the Challenger Deep and 145 km south of Guam.
== Discovery ==
In 1997, the Hawaii Mapping Research Group conducted a detailed sonar survey of the seafloor around Guam, discovering what is believed to be the second or third deepest〔〔〔 location in the world's oceans; its existence was confirmed in 2001 and it was temporarily named HMRG Deep.〔〔 In the same research mission, scientists found previously undiscovered faults, landslides, and mud volcanoes.〔
The data that confirmed the discovery were collected using the HAWAII MR1 mapping system. This mapping system has the ability to record both bathymetry and sidescan data at the same time. The two vessels that this system was used on were ''RIV Moana Wave'' in 1997 and ''RIV Melville'' in 2001.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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