The U.S. Geological Survey reported a magnitude 7.0 earthquake has struck off the coast of the Falkland Islands.

The quake struck around 2:30 a.m. local time about 195 miles southeast of the Falklands’ capital city Stanley. The depth of the quake was 6.2 miles.

The USGS reported at least four other quakes had preceded the 7.0 quake all measuring more than 5.0 during a two hour period.

Researchers are concerned because the region of the quake is not known for strong seismic activity. Only 15 quakes total over 5.0 magnitude have been recorded in the region during the last 40 years including the 5 today.

The largest quake near to that area was a 6.6 magnitude quake in September 1993.