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Posts Tagged ‘Alpine Fault’

Strong Earthquake Strikes near New Zealand

Posted by feww on July 11, 2017

SN-036T

M 6.6 Quake Strikes NW of Auckland Islands, New Zealand

EQ Details

Magnitude: 6.6 mww
Location: 49.546°S 164.031°E [198km NW of Auckland Island, New Zealand]
Depth: 10.0 km
Time: 07:00:01 UTC  2017-07-11

[Additional information available via 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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Two Significant Quakes Strike New Zealand

Posted by feww on December 6, 2013

“Strong” quakes strike along the Alpine Fault

The first quake registered magnitude 4.7 and struck about 5km south-west of Seddon, upper South Island, rattling buildings in downtown Wellington, according to local reports.

Magnitude: 4.7
Depth: 21 km
Epicenter: 41.70ºS, 174.03ºE
Location 5 km south-west of Seddon
Date/Time:  December 6 2013 at 0:45:00UTC
Intensity:  Strong (MM scale)
Source: Geonet

The second quake, also measuring magnitude 4.7, struck 10 km north-west of Milford Sound near the lower South Island shaking Milford Sound, about two hours later.

Magnitude: 4.7
Depth: 16 km
Epicenter:  44.58ºS, 167.88ºE
Location: 10 km north-west of Milford Sound
Date/Time: December 6 2013 at 02:56:30UTC
Intensity: Strong  (MM scale)
Source: Geonet

The quakes followed another significant quake, measuring magnitude 4.2, which struck at a depth of 5km, about 20 km west of Reefton (42.03ºS, 171.65ºE) on Sunday, according to Geonet records.

Be sure to search blog content for important information concerning NZ earthquakes.

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