Fire Earth

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Posts Tagged ‘North New Hebrides Trench’

Enhanced Seismicity Continues in Hot Spot near Sanma, Vanuatu

Posted by feww on April 15, 2016

M6.4 quake strikes NW of Port-Olry, Vanuatu

EQ Ddetails

Magnitude: 6.4Mw
Location: 14.523°S 166.352°E
Depth: 16.0 km (9.9 mi)- 95km NW of Port-Olry, Vanuatu
Time: 2016-04-14 21:50:27 (UTC)
Distances:

  • 95.0 km (59.0 mi) NW of Port-Olry, Vanuatu
  • 142.0 km (88.2 mi) NW of Luganville, Vanuatu
  • 413.0 km (256.6 mi) NNW of Port-Vila, Vanuatu
  • 714.0 km (443.7 mi) N of We, New Caledonia
  • 842.0 km (523.2 mi) N of Paita, New Caledonia

[Source: USGS/EHP]

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Strong Earthquake Jolts Port-Olry, Vanuatu

Posted by feww on April 3, 2016

M6.9 Quake Strikes Vanuatu Region

EQ Locations
Magnitude: 6.9Mw
Location: 14.352°S 166.821°E
Depth: 35.0 km
Date/ Time: 2016-04-03 @ 08:23:53 UTC
Nearby Cities

  • 81km (50mi) NNW of Port-Olry, Vanuatu
  • 135km (84mi) NNW of Luganville, Vanuatu
  • 407km (253mi) NNW of Port-Vila, Vanuatu

[Source: USGS/EHP]

Felt Areas Include Sanma, Torba and Luganville

Tsunami Evaluation Issued by PTWC [09:12UTC SUN APR 3 2016]-

  • MINOR SEA LEVEL FLUCTUATIONS OF UP TO 0.3 METERS ABOVE AND BELOW THE NORMAL TIDE MAY CONTINUE OVER THE NEXT FEW HOURS.
  • THE TSUNAMI THREAT FROM THIS EARTHQUAKE HAS NOW MOSTLY PASSED. ANY REMAINING THREAT SHOULD BE EVALUATED BY LOCAL AUTHORITIES IN IMPACTED AREAS.

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Powerful Earthquake Strikes Santa Cruz Islands

Posted by feww on July 18, 2015

3rd Revision by yet another seismologist (!)
M7.0; 10.38S, 165.20E ; depth=10km 

M7.2 Strikes WNW of Lata, Solomon Islands

Centered at 10.38ºS, 165.19ºE the quake occurred at a depth of about 2km, reported emsc-csem.org

Pacific Tsunami center has issued the following statement:

TSUNAMI EVALUATION

BASED ON THE PRELIMINARY EARTHQUAKE PARAMETERS… HAZARDOUS
TSUNAMI WAVES ARE POSSIBLE FOR COASTS LOCATED WITHIN 300 KM OF
THE EARTHQUAKE EPICENTER.

TSUNAMI THREAT FORECAST

* HAZARDOUS TSUNAMI WAVES FROM THIS EARTHQUAKE ARE POSSIBLE WITHIN 300 KM OF THE EPICENTER ALONG THE COASTS OF SOLOMON ISLANDS

EQ Details

Magnitude: 7.2Mw
Region: SANTA CRUZ ISLANDS
Date/time: 2015-07-18 at 02:27:31.9 UTC
Location: 10.38ºS ; 165.19ºE
Depth 2 km
Distances 584 km E of Honiara, Solomon Islands / pop: 56,298 / local time: 13:27:31.9 2015-07-18
358 km E of Kirakira, Solomon Islands / pop: 1,122 / local time: 13:27:31.9 2015-07-18

Aftershocks

M5.1, 10.31S,164.96E 2015-07-18 at 04:30:04.3; depth=2km
M4.9, 10.31S,165.08E 2015-07-18 at 03:32:34.9; depth=2km

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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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