Strong and deep earthquake M 6.3 struck North Island of New Zealand

strong-and-deep-earthquake-m-6-3-struck-north-island-of-new-zealand

A strong and deep 6.3 magnitude earthquake struck North Island of New Zealand on December 7, 2012 at 18:19 UTC. Epicenter was located 18 km (11 miles) SE of Tokoroa, New Zealand, 27 km (16 miles) SW of Rotorua, New Zealand and 39 km (24 miles) N of Taupo, New Zealand at coordinates 38.334°S, 176.044°E. Recorded depth by USGS was 167.2 km (103.9 miles). Both USGS and EMSC reported magnitude 6.3. EMSC reported depth of 146 km.

Geonet / GNS Science reports a Magnitude of 5.8 at a depth of 175 km.

GDACS reported that this earthquake can have a low humanitarian impact based on the Magnitude and the affected population and their vulnerability. 550 000 people are living within 100 km.

Magnitude 6.3
Date-Time
  • Friday, December 07, 2012 at 18:19:08 UTC
  • Saturday, December 08, 2012 at 07:19:08 AM at epicenter
Location 38.334°S, 176.044°E
Depth 167.2 km (103.9 miles)
Region NORTH ISLAND OF NEW ZEALAND
Distances 18 km (11 miles) SE of Tokoroa, New Zealand
27 km (16 miles) SW of Rotorua, New Zealand
39 km (24 miles) N of Taupo, New Zealand
72 km (44 miles) S of Tauranga, New Zealand
Location Uncertainty horizontal +/- 13.2 km (8.2 miles); depth +/- 8 km (5.0 miles)
Parameters NST=173, Nph=181, Dmin=93.5 km, Rmss=1.71 sec, Gp= 47°,
M-type=teleseismic moment magnitude (Mw), Version=8
Source
  • Magnitude: USGS NEIC (WDCS-D)
    Location: USGS NEIC (WDCS-D)
Event ID usc000e5z5

 

December 7, 2012 – M 6.3 North Island of New Zealand

Tectonic summary by USGS

Seismotectonics of the Eastern Margin of the Australia Plate

The eastern margin of the Australia plate is one of the most seismically active areas of the world due to high rates of convergence between the Australia and Pacific plates. In the region of New Zealand, the 3000 km long Australia-Pacific plate boundary extends from south of Macquarie Island to the southern Kermadec Island chain. It includes an oceanic transform (the Macquarie Ridge), two oppositely verging subduction zones (Puysegur and Hikurangi), and a transpressive continental transform, the Alpine Fault through South Island, New Zealand.

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. The last M7.5+ earthquake along the Alpine Fault was 170 years ago; studies of the faults’ strain accumulation suggest that similar events are likely to occur again.

North of New Zealand, the Australia-Pacific boundary stretches east of Tonga and Fiji to 250 km south of Samoa. For 2,200 km the trench is approximately linear, and includes two segments where old (>120 Myr) Pacific oceanic lithosphere rapidly subducts westward (Kermadec and Tonga). At the northern end of the Tonga trench, the boundary curves sharply westward and changes along a 700 km-long segment from trench-normal subduction, to oblique subduction, to a left lateral transform-like structure. More information on regional seismicity and tectonics

Featured image: EMSC + Google Earth

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