List of earthquakes in Vanuatu

From Wikipedia, the free encyclopedia
  (Redirected from Port Vila Vanuatu earthquakes)
Jump to: navigation, search

Earthquakes in Vanuatu are frequent and are sometimes accompanied by tsunami, though these events are not often destructive. The archipelago, which was formerly known as New Hebrides, lies atop a complex and active plate boundary in the southwestern Pacific Ocean.

Tectonic setting[edit]

The primary tectonic feature of the 1,200 km (750 mi) island chain is the New Hebrides Subduction Zone, the convergent boundary of the Australian and Pacific Plates. Along the Wadati–Benioff zone, earthquake activity has been observed as shallow, intermediate, and deep-focus events at depths of up to 700 km (430 mi). Volcanic activity is also present along this north-northwest trending and northeast-dipping oceanic trench.[1]

While much of the island arc experiences intermediate-depth earthquakes along a Wadati–Benioff zone that dips steeply at 70°, the area adjacent to the d'Entrecasteaux Ridge does not. There is a corresponding gap in seismicity that occurs below 50 km (31 mi) where it intrudes into the subduction zone from the west. According to the NUVEL-1 global relative plate motion model, convergence is occurring at roughly 8 cm (3.1 in) per year. The uncertainty, which also affects the Tonga arc, is due to the influence of spreading at the North Fiji basin. Of the 58 M7 or greater events that occurred between 1909 and 2001, few were studied.[2]

Earthquakes[edit]

Date Region M MMI Fatalities Injuries Comments
1909-07-08 Moderate damage / tsunami NGDC
1910-11-10 Moderate damage / tsunami NGDC
1965-08-11 7.6 Mw Moderate damage / tsunami NGDC
1971-10-28 7.1 Ms VII 1 Some Severe damage NGDC
1973-12-29 7.5 Ms VII Moderate damage NGDC
1973-12-29 7.2 Ms VIII Moderate damage NGDC
1990-07-27 Espiritu Santo 6.4 Mb V 2 Moderate damage NGDC
1997-04-21 Santa Cruz Islands 7.7 Mw Some damage / tsunami [3]
1999-11-26 Ambrym 7.4 Mw 5–10 40–100 Landslides / damage / five killed by tsunami
2002-01-03 7.2 Mw Several Rockslides / damage [4]
2002-11-28 5.9 Mw 3 Landslides / damage [5]
2009-05-29 5.7 Mw 10 Landslides / damage [6]
2009-06-03 6.3 Mw 4 Landslides [7]
Note: The inclusion criteria for adding events is based on WikiProject Earthquakes' notability guideline that was developed for stand alone articles. The principles described are also applicable on lists. In summary, only damaging, injurious, or deadly events should be recorded.

See also[edit]

References[edit]

Sources

External links[edit]