According to CCTV reports, recently, Japanese researchers used a manned submersible to reach a depth of 7,500 meters on the seabed.The fault cliff formed during the Great East Japan Earthquake was photographed for the first time (2011). According to the report,The cliff is 26 meters high and is seven or eight stories high.There are large and small lumps of uneven soil piled up around it. It is speculated that this is the upper end of the submarine fault formed during the great earthquake in Japan.
Researchers said that when the ground movement speed reaches 1 meter per second, submarine faults will rise and form towering cliffs. The faults discovered this time can help improve the accuracy of disaster predictions such as earthquakes and tsunamis.
As early as 2011, a magnitude 9 earthquake in the Pacific Ocean in northeastern Japan affected the topography of many areas, including the Japan Trench east of Honshu Island, Japan. Since the Japan Trench is located in the deep sea with a water depth of several thousand meters, on-site surveys have not been possible before.
Japan began conducting deep-sea surveys of the area last year and discovered this raised terrain, which did not exist before the earthquake.
Researchers believe that when a strong earthquake occurs,The seafloor in the Japan Trench area moved horizontally eastwards by 80 to 120 meters along the fault, causing the front end of the plate to be sharply lifted by about 60 meters, and part of it collapsed along the fault, forming a fault scarp.
Additional background:
On March 11, 2011, local time, a strong earthquake occurred in the Pacific Ocean in northeastern Japan, reaching a magnitude of 9.0, making it the fifth largest earthquake in history. The huge tsunami triggered by this earthquake caused devastating damage to Iwate, Miyagi, Fukushima and other places in northeastern Japan.and triggered a nuclear leak at the Fukushima Daiichi Nuclear Power Plant.