The Chinese scientists, with the university's Laboratory of Seismology and Physics of the Earth's Interior, said in their online statement that the signal they had picked up from two seismic monitor stations in Malaysia seemed to indicate that a slight tremor occurred on the sea floor at about 2.55am on March 8, some 150 kilometres off the southern tip of Vietnam.

A South China Sea map showing the possible location of the tremor on the sea floor (red star) and the two Malaysian seismic monitor stations (blue triangles). Photo: Handout by the Seismology and Physics of the Earth's Interior Laboratory, University of Science and Technology of China
"It was a non-seismic zone, therefore judging from the time and location of the event, it might be related to the missing MH370 flight," said the statement.
The seismic event happened about 85 minutes after MH370 lost contact with air control, and about 116 km northeast of the spot where it was reportedly last heard from.
“If it was indeed an airplane crashing into the sea, the seismic wave strength indicated that the crash process was catastrophic," the statement said.
http://www.scmp.com/news/asia/article/1448353/us-suggests-search-missing-flight-expand-indian-ocean-mh370-satellite