Quakes, Southern Ocean

A burst of earthquake activity struck the southern ocean, south of New Zealand this evening.

Thursday 18th March 2010

A burst of moderately strong earthquake activity struck the southern ocean, south of New Zealand this evening with three earthquakes within less than twenty minutes, one of which was reported felt ashore.

The U.S. Geological Survey reported three earthquakes near the Snares Islands over a period of 18 minutes this evening. Activity commenced with a magnitude 4.9 quake at 7:24 p.m. New Zealand Daylight Time, located 365 km south-west of Invercargill at a depth of 10 km.

A magnitude 5.3 earthquake followed at 7:29 p.m. This earthquake was located 375 km south-west of Invercargill at a depth of 10km. Thirteen minutes later a magnitude 5.1 quake struck 350 km south-west of Invercargill at a depth of 10 km.

GeoNet has reported on only the largest of the three events despite its seismographs distinctly showing the three events. GeoNet reports the 7:29 p.m. quake as magnitude 5.7 at a depth of 33 km located 150 km south-west of the Snares, 250 km north of Auckland Island, 360 km south-west of Invercargill. Their report has attracted reports from the public who felt the quake in Southland and on Stewart Island.

[Complied from data supplied by the U.S. Geological Survey and their contributing agencies, and GeoNet. ]

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