Magnitude 6.4 shallow earthquake hit Balleny Islands region

magnitude-6-4-shallow-earthquake-hit-balleny-islands-region

Strong and shallow earthquake with recorded magnitude of 6.4 hit Balleny Islands region on October 9, 2012 at 12:32 UTC according to USGS. Epicenter was located 729 km (452 miles) NW of Young Island and 1875 km (1165 miles) SSW of Invercargill, New Zealand at coordinates 61.033°S, 153.960°E. Recorded depth was 10.2 km (6.3 miles). EMSC recorded magnitude 5.8 and depth of 10 km.

GDACS writes that this earthquake can have a low humanitarian impact based on the magnitude and the affected population and their vulnerability. There are no people living within 100 km radius.

No tsunami warning was issued associated with this earthquake.

Magnitude 6.4
Date-Time
  • Tuesday, October 09, 2012 at 12:32:04 UTC
  • Tuesday, October 09, 2012 at 10:32:04 PM at epicenter
Location 61.033°S, 153.960°E
Depth 10.2 km (6.3 miles)
Region BALLENY ISLANDS REGION
Distances 729 km (452 miles) NW of Young Island,
1875 km (1165 miles) SSW of Invercargill, New Zealand
1924 km (1195 miles) SSW of Gore, New Zealand
2000 km (1242 miles) SSW of Dunedin, New Zealand
Location Uncertainty horizontal +/- 27.4 km (17.0 miles); depth +/- 4.5 km (2.8 miles)
Parameters NST= 45, Nph= 45, Dmin=787 km, Rmss=0.8 sec, Gp=126°,
M-type=regional moment magnitude (Mw), Version=6
Source
  • Magnitude: USGS NEIC (WDCS-D)
    Location: USGS NEIC (WDCS-D)
Event ID usc000d4li

 

Historic seismicity map – M 7+ since 1900

 

The Balleny Islands (66°55′S 163°45′E) are a series of uninhabited islands in the Southern Ocean extending from 66°15′ to 67°35’S and 162°30′ to 165°00’E. The group extends for about 160 km (99 mi) in a northwest-southeast direction. The islands are heavily glaciated and are of volcanic origin. Glaciers project from their slopes into the sea. The islands were formed by the so-called Balleny hotspot.

In the archipelago, the Buckle, Sturge and Young Islands are examples of stratovolcanoes. Strong earthquakes very close to the islands are rare, but tremors of moderate strength do occur over the Pacific–Antarctic Ridge, Macquarie Triple Junction and Pacific Rim between the Balleny Islands and Macquarie Island. Other earthquakes occur near the Southeast Indian Ridge and Balleny Fracture Zone, including a magnitude 8.1 earthquake in 1998 that struck just over 700 km (430 mi) west-northwest of the Islands.

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