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Posts Tagged ‘Sumbawa earthquake’

Powerful Quake Strikes Fiji

Posted by feww on November 9, 2009

Another powerful earthquake strikes Fiji – more intense seismic activity could occur in the region this year

A powerful quake measuring up to 7.3 Mw struck Fiji at 17.212°S, 178.413°E or about 100 km north of the capital, Suva and at a depth of 585 km on Monday, November 09, 2009 at 10:45 UTC.

The mainshock was followed by at least one aftershock measuring 5.3 Mw.

On August 19, 2009 FEWW Moderators posted the following entry:

New Round of Geo-Assualt at Kermadec Trench

Following the powerful 7.8 magnitude earthquake that struck the tip of the Fiordland, South island, New Zealand, followed by a large cluster of aftershocks, another round of geo-assault appears to be gearing up at the southern end of the Kermadec trench.

The Fiordland quakes occurred as a result of a large reverse faulting motion caused by the subduction of the Australian subplate under the Pacific plate, on which Fiordland rests,  in Puysegur Trench, at the Alpine Fault.

The new wave of earthquakes would instead be caused by the ‘mirror image’ action, with Pacific plate subducting beneath the Australian protoplate.

A magnitude 6.3 earthquake that struck south of the Fiji Islands on August 18, 2009 at 21:21 UTC may herald a new round of intense [and unprecedented] seismic activity at Kermadec Trench to the north, NE, and East of the North Island, as well as the north, NE, and east of the South Island, New Zealand.

10-degree Map Centered at 15°S,180°E

fiji 9Nov09
Earthquake location Map. Source: USGS/EHP. Enhanced by FEWW

Earthquake Details:

  • Magnitude: 7.2 [Maximum quake magnitude estimated by FEWW at 7.0 Mw]
  • Date-Time:
    • Monday, November 09, 2009 at 10:44:54 UTC
    • Monday, November 09, 2009 at 10:44:54 PM at epicenter
  • Location: 17.212°S, 178.413°E
  • Depth: 585.1 km (363.6 miles)
  • Region: FIJI
  • Distances:
    • 100 km (65 miles) N of SUVA, Viti Levu, Fiji
    • 135 km (85 miles) SW of Lambasa, Vanua Levu, Fiji
    • 485 km (300 miles) NW of Ndoi Island, Fiji
    • 2205 km (1370 miles) N of Auckland, New Zealand
  • Location Uncertainty: horizontal +/- 7 km (4.3 miles); depth +/- 9 km (5.6 miles)
  • Source:  USGS NEIC (WDCS-D)
  • Event ID: us2009nuam

Seismic Hazard Map
neic_nuam_w

Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green- USGS/EHP

Seismic Hazard Map

neic_nuam_7
Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green- USGS/EHP

Tsunami Info:

NOAA Pacific Tsunami Warning Center reported NO destructive tsunami as a result of this event.

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Posted in earthquake, earthquake forecast, Earthquakes, eww earthquake forecast, Fiji earthquakes, seismic activity report | Tagged: , , , , , , , , , , , , , | Leave a Comment »

Powerful quake shakes Sumbawa, Indonesia

Posted by feww on November 8, 2009

M7.0 Earthquake Strikes Sumbawa, Indonesia

Powerful earthquake measuring up to 7.0Mw struck Indonesia’s Sumbawa region, about 77 km east of Tambora volcano and at an estimated  depth of 18 km, November 8, 2009 at 19:41 UTC.

Mount Tambora’s 1815 eruption (Volcanic  Explosivity Index of 7) was the largest in modern history, and perhaps the deadliest of all time, with up to an estimated 100,000 people losing their lives as a result.

Alarmed by its findings concerning the prospect of intense seismic activity in the region, FEWW featured Mt Tambora in its weekly volcano watch VolcanoWatch Weekly  dated 23 July 2009.

See also September 28, 2009 entry:  Up to 3 More Large EQs Could Strike the Pacific Ring of Fire in 2009

FEWW Moderators believe that further, intense seismic activity would most likely occur in the region in the near future.

10-degree Map Centered at 10°S,120°E

sumbawa - I
Earthquake location Map. Source: USGS/EHP. Enhanced by FEWW

Earthquake Details:

  • Magnitude: 6.7  [Maximum quake magnitude estimated by FEWW at 7.0 Mw]
  • Date-Time:
    • Sunday, November 08, 2009 at 19:41:44 UTC
    • Monday, November 09, 2009 at 03:41:44 AM at epicenter
  • Location: 8.316°S, 118.697°E
  • Depth: 18.3 km (11.4 miles) (poorly constrained)
  • Region: SUMBAWA REGION, INDONESIA
  • Distances:
    • 15 km (10 miles) NNW of Raba, Sumbawa, Indonesia
    • 310 km (190 miles) ENE of Mataram, Lombok, Indonesia
    • 330 km (205 miles) W of Ende, Flores, Indonesia
    • 1335 km (830 miles) E of JAKARTA, Java, Indonesia
  • Location Uncertainty: horizontal +/- 9.3 km (5.8 miles); depth +/- 33 km (20.5 miles)
  • Source:  USGS NEIC (WDCS-D)
  • Event ID: us2009nta5

Tsunami Info:

NOAA Pacific Tsunami Warning Center Center issued the following evaluation:

A destructive widespread tsunami threat does NOT exist based on   historical earthquake and tsunami data.   However – there is a very small possibility of a local tsunami that could affect coasts located usually no more than a hundred kilometers from the earthquake epicenter. Authorities in the region near the epicenter should be made aware of this possibility.

Historic Seismicity

neic_nta5_7  indonesia 9Nov09
Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green- USGS/EHP

Seismic Hazard Map

neic_nta5_w - 9Nov09

Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green- USGS/EHP

Related Links:

Other Related Links [Including FEWW forecasts]

Posted in earthquake forecast, Earthquakes, feww earthquake forecast, Indonisia earthquakes, seismic activity report, seismic hazard report | Tagged: , , , , , , , , , | 1 Comment »