Magnitude 7.4 - AUCKLAND ISLANDS, NEW ZEALAND REGION
2007 September 30 05:23:34 UTC
- This event has been reviewed by a seismologist.
|Depth||10 km (6.2 miles) set by location program|
|Region||AUCKLAND ISLANDS, NEW ZEALAND REGION|
|Distances||195 km (120 miles) NW of Auckland Island, New Zealand|
470 km (290 miles) SW of Invercargill, New Zealand
1245 km (770 miles) SW of WELLINGTON, New Zealand
1980 km (1230 miles) SSE of CANBERRA, A.C.T., Australia
|Location Uncertainty||horizontal +/- 6.4 km (4.0 miles); depth fixed by location program|
|Parameters||NST=252, Nph=252, Dmin=661.8 km, Rmss=1.06 sec, Gp= 22°,|
M-type=centroid moment magnitude (Mw), Version=R
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The following is a release by the United States Geological Survey, National Earthquake Information Center: An earthquake occurred 205 km (125 miles) NW of Auckland Island, New Zealand 475 km (295 miles) SW of Invercargill, New Zealand 1245 km (770 miles) SW of WELLINGTON, New Zealand 1965 km (1220 miles) SSE of CANBERRA, A.C.T., Australia at 11:23 PM MDT, Sep 29, 2007 (Sep 30 at 4:23 PM local time in Auckland Islands). The magnitude and location may be revised when additional data and further analysis results are available. No reports of damage or casualties have been received at this time.
Felt (III) at Invercargill; also felt at Christchurch, Dunedin and Rotorua.
The magnitude 7.3 earthquake west of the Auckland Islands on September 30, 2007 indicates thrust faulting on the boundary between the Australian and Pacific Plates. The earthquake is located at the southeast end of the small Puysegur subduction zone where a segment of the Australian plate subducts to the NNE beneath the South Island of New Zealand (Pacific plate) at approximately 32 mm/yr. Its location is immediately north of the transition from dominantly strike-slip plate motions along the Macquarie Ridge to the south, to the subduction related thrusting to the north. This plate boundary transition is well delineated by numerous earthquakes of both thrust and strike-slip orientation, although this is the largest earthquake in the region since the magnitude 7.6 strike-slip event less than 100 km to the north in May 1981.
The Australia:Pacific plate boundary region west of the Auckland Islands has a history of large earthquakes both along the plate boundary proper and also west of the plate boundary internal to the Australian Plate. The September 30th event is approximately 200 km east of the magnitude 8.1 earthquake of December 2004, which occurred within the oceanic lithosphere of the Australian Plate, and about 450 km northeast of the magnitude 8.0 earthquake of May 1989 that occurred along the Macquarie Ridge plate boundary itself.
Scientific & Technical Information
The earthquake locations and magnitudes cited in NOAA tsunami statements and bulletins are preliminary and are superseded by USGS locations and magnitudes computed using more extensive data sets.
General Tsunami Information
- Preliminary Earthquake Report
- U.S. Geological Survey, National Earthquake Information Center:
World Data Center for Seismology, Denver