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Posts Tagged ‘Hikurangi’

FIRE-EARTH Tectonics Watch: Australia-Pacific Plate Boundary

Posted by feww on March 30, 2017

ALN – LSH

Seismotectonics of the Eastern Margin of the Australia Plate: Hikurangi Trench

“Strong” Earthquake  Strikes near Turangi, NZ

The quake was one of a swarm of at least 32 shocks that hit the area.

EQ Details [USGS/EHP]
Magnitude:     4.6 mwr
Location    38.826°S 175.746°E
Depth:     7.5 km
Time:     2017-03-29 on 23:58:49.240 (UTC)

EQ Details [Geonet, NZ]
Universal Time: March 29 2017, 23:58:49
Depth: 6km
Magnitude: 4.5
Location: -38.93, 175.67 [15 km north-west of Turangi]

  • Analysis available from FIRE-EARTH PULSARS.

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M6.5 Strikes South of the Fiji Islands

Posted by feww on March 26, 2014

15 M7.5+ earthquakes recorded near New Zealand since 1900

Earthquake Details

Magnitude: 6.5Mw
Event Time: 2014-03-26 03:29:36 UTC
Location: 26.092°S 179.279°E depth=493.1km (306.4mi)
Nearby Cities:

  • 448km (278mi) NW of Raoul Island, New Zealand
  • 786km (488mi) SW of Nuku`alofa, Tonga
  • 884km (549mi) S of Suva, Fiji

Seismotectonics of the Eastern Margin of the Australia Plate

Excerpts from the Tectonic Summary [sourced from USGS]

Since 1900 there have been 15 M7.5+ earthquakes recorded near New Zealand. Nine of these, and the four largest, occurred along or near the Macquarie Ridge, including the 1989 M8.2 event on the ridge itself, and the 2004 M8.1 event 200 km to the west of the plate boundary, reflecting intraplate deformation. The largest recorded earthquake in New Zealand itself was the 1931 M7.8 Hawke’s Bay earthquake, which killed 256 people.

Large earthquakes are common along the North New Hebrides trench and have mechanisms associated with subduction tectonics, though occasional strike slip earthquakes occur near the subduction of the D’Entrecasteaux ridge. Within the subduction zone 34 M7.5+ earthquakes have been recorded since 1900. On October 7, 2009, a large interplate thrust fault earthquake (M7.6) in the northern North New Hebrides subduction zone was followed 15 minutes later by an even larger interplate event (M7.8) 60 km to the north. It is likely that the first event triggered the second of the so-called earthquake “doublet”.

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