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Strong earthquake magnitude 6.2 struck Santa Cruz Islands

Friday, February 1, 2013 0:21
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USGS reported strong earthquake of magnitude 6.2 and depth 7.1 km (4.4 miles) in Santa Cruz Islands on February 01, 2013 at 05:36:41 UTC.  Epicenter of the earthquake was located 59 km (36 miles) SW of Lata, Solomon Islands and 520 km (323 miles) NNW of Luganville, Vanuatu at coordinates 11.134°S, 165.480°E. EMSC has reported magnitude 6.3 earthquake in the same region at depth of 30 km (18.64 miles) with coordinates 11.10 S ; 165.53 E.

Magnitude 6.2
  • Friday, February 01, 2013 at 05:36:41 UTC
  • Friday, February 01, 2013 at 04:36:41 PM at epicenter
  • Time of Earthquake in other Time Zones
Location 11.134°S, 165.480°E
Depth 7.1 km (4.4 miles)
Distances 59 km (36 miles) SW of Lata, Solomon Islands
520 km (323 miles) NNW of Luganville, Vanuatu
634 km (393 miles) ESE of Honiara, Solomon Islands
792 km (492 miles) NNW of Port-Vila, Vanuatu
Location Uncertainty horizontal +/- 14.9 km (9.3 miles); depth +/- 2.6 km (1.6 miles)
Parameters NST=232, Nph=235, Dmin=634.5 km, Rmss=1.16 sec, Gp= 47°,
M-type=regional moment magnitude (Mw), Version=7
  • Magnitude: USGS NEIC (WDCS-D)
    Location: USGS NEIC (WDCS-D)
Event ID usc000ezil

Tectonic summary by USGS

The eastern margin of the Australia plate is one of the most sesimically 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.

Australia-Pacific convergence rates increase northward from 60 mm/yr at the southern Kermadec trench to 90 mm/yr at the northern Tonga trench; however, significant back arc extension (or equivalently, slab rollback) causes the consumption rate of subducting Pacific lithosphere to be much faster. The spreading rate in the Havre trough, west of the Kermadec trench, increases northward from 8 to 20 mm/yr. The southern tip of this spreading center is propagating into the North Island of New Zealand, rifting it apart. In the southern Lau Basin, west of the Tonga trench, the spreading rate increases northward from 60 to 90 mm/yr, and in the northern Lau Basin, multiple spreading centers result in an extension rate as high as 160 mm/yr. The overall subduction velocity of the Pacific plate is the vector sum of Australia-Pacific velocity and back arc spreading velocity: thus it increases northward along the Kermadec trench from 70 to 100 mm/yr, and along the Tonga trench from 150 to 240 mm/yr.

The Kermadec-Tonga subduction zone generates many large earthquakes on the interface between the descending Pacific and overriding Australia plates, within the two plates themselves and, less frequently, near the outer rise of the Pacific plate east of the trench. Since 1900, 40 M7.5+ earthquakes have been recorded, mostly north of 30°S. However, it is unclear whether any of the few historic M8+ events that have occurred close to the plate boundary were underthrusting events on the plate interface, or were intraplate earthquakes. On September 29, 2009, one of the largest normal fault (outer rise) earthquakes ever recorded (M8.1) occurred south of Samoa, 40 km east of the Tonga trench, generating a tsunami that killed at least 180 people.

Across the North Fiji Basin and to the west of the Vanuatu Islands, the Australia plate again subducts eastwards beneath the Pacific, at the North New Hebrides trench. At the southern end of this trench, east of the Loyalty Islands, the plate boundary curves east into an oceanic transform-like structure analogous to the one north of Tonga.

Australia-Pacific convergence rates increase northward from 80 to 90 mm/yr along the North New Hebrides trench, but the Australia plate consumption rate is increased by extension in the back arc and in the North Fiji Basin. Back arc spreading occurs at a rate of 50 mm/yr along most of the subduction zone, except near ~15°S, where the D’Entrecasteaux ridge intersects the trench and causes localized compression of 50 mm/yr in the back arc. Therefore, the Australia plate subduction velocity ranges from 120 mm/yr at the southern end of the North New Hebrides trench, to 40 mm/yr at the D’Entrecasteaux ridge-trench intersection, to 170 mm/yr at the northern end of the trench.

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

Strong earthquake magnitude 6.2 struck Santa Cruz Islands

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  • Givi Alaznis’Pireli

    News about Earth’s Core, earthquakes and oldest lost Civilizations – was found main cause of all great problems of our Planet. It was founded on the basis of ancient Egyptian texts.

    I think all Authors of good comments are reasonable people and you are looking the true of our Planet and Cosmos. Please, who can explain me why the Earth’s electromagnetic field is large in Caucasus area only? Two physicists proves that in the territory of Republic of Georgia especially on extensive space the high-frequency information signals are spread. This strange fact was checked by the foreign specialists from Ukraine with special equipment and they have proven too: this is indeed the case! But why is that so? It turns the chief reason of this phenomenon is an Egyptian sacral Sun – “Rá”, as super radiance, which rests under whole Caucasus’ territory (see the illustration No 1 on my FB page because here is no a window for it). Yes, it is the GREATEST DISCOVERY OF THE WORLD, WHICH WILL CHANGE THINKING OF MANKIND at nearest time.

    In my opinion this underground Sun is the first reason of such strong earthquakes: because plus and minus attract each other, there is a discharge portions accumulated in the Earth’s virtual Core under Caucasus between megaton hydrogen sulfide (this is very negative, passive energy and the cause of death) and the phenomenon of “Rá” (super Light, the cause of life), which is in Epicenter of so called “Lower world” for oldest Egyptian people (see the illustration No 2 on my page). By the logic of such a powerful flow of energy delivery has heated underground water, expandable and comes to the surface of the Earth. I think, may be this underground strong temperature is causing the global warming on our Planet. The result is flooding some beachs of oceans and seas, but the chance of salvation still exists. The logical explanation why the electromagnetic field is big in sky of Georgian area is given at this link (there is good translated). I recommend you to read it (no virus and free of charge): , or go at,11&vtkid=

    Publisher of newspaper “Noe”,
    Esoteric writer Givi Alaznis’Pireli
    from Republic of Georgia.

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