Second massive Kermadec Islands earthquake in 4 months time

Earthquake overview :  At 05:57 October 22 2011 local time, a massive 7.4 earthquake struck the Kermadec trench area. The closest island at several hundred km was Raoul Island. The island is a scientific base from New Zealand and people are well trained to deal with strong earthquakes which are common in this area of the world.
"I have Felt it" Reports --> see below + Let us know "how you have felt this earthquake"
To read the full story as it happened, we advise our readers to start at the lower part of the page (earthquake data).
Read also : Understanding the Magnitude 7.6 Kermadec Islands earthquake (July 6, 2011)
Read also : Massive earthquake Kermadec Islands (July 6, 2011)

Update:  The October 21 earthquake may be related to the July 6 aftershock sequence.

Update:  Swimmers, divers and recreational boat users are advised to be cautious as abnormally strong currents may be experienced in some locations in the north island of New Zealand.

Update : Following NOAA sea level gauges on Raoul Island measured wave heights of between 10 cm and 17 cm.  New Zealand Tsunami Experts Panel has decided there is no threat to the country.

Update:  Data from other seismological agencies :
GNS Science (New Zealand): 7.3 @ 16 km
Geoscience Australia: 7.3 @ 35 km
GFZ: M 7.3 @ 21 km
EMSC:  7.4 @ 40 km

Update: On July 6 2011 an almost similar earthquake (M 7.6) also created a limited local tsunami without being dangerous for populated islands. See links above

Information Bulletin Supplement Pacific Ocean :
SEA LEVEL READINGS INDICATE A TSUNAMI WAS GENERATED. IT MAY HAVE BEEN DESTRUCTIVE ALONG COASTS NEAR THE EARTHQUAKE EPICENTER. FOR THOSE AREAS - WHEN NO MAJOR WAVES ARE OBSERVED FOR TWO HOURS AFTER THE ESTIMATED TIME OF ARRIVAL OR DAMAGING WAVES HAVE NOT OCCURRED FOR AT LEAST TWO HOURS THEN LOCAL AUTHORITIES CAN ASSUME THE THREAT IS PASSED. DANGER TO BOATS AND COASTAL STRUCTURES CAN CONTINUE FOR SEVERAL HOURS DUE TO THE CONTINUING SEA LEVEL CHANGES AND RAPID CURRENTS.  AS LOCAL CONDITIONS CAN CAUSE A WIDE VARIATION IN TSUNAMI WAVE ACTION THE ALL CLEAR DETERMINATION MUST BE MADE BY LOCAL AUTHORITIES. NO TSUNAMI THREAT EXISTS FOR OTHER COASTAL AREAS IN THE PACIFIC ALTHOUGH SOME OTHER AREAS MAY EXPERIENCE SMALL NON-DESTRUCTIVE SEA LEVEL CHANGES LASTING UP TO SEVERAL HOURS
NOAA Pacific Ocean message :

NO DESTRUCTIVE WIDESPREAD TSUNAMI THREAT EXISTS BASED ON HISTORICAL EARTHQUAKE AND TSUNAMI DATA.
NOAA Hawaii message :
BASED ON ALL AVAILABLE DATA A DESTRUCTIVE PACIFIC-WIDE TSUNAMI IS NOT EXPECTED AND THERE IS NO TSUNAMI THREAT TO HAWAII. REPEAT. A  DESTRUCTIVE PACIFIC-WIDE TSUNAMI IS NOT EXPECTED AND THERE IS NO TSUNAMI THREAT TO HAWAII.

Local tsunami in an unpopulated area - courtesy GDACS

Update:The earthquake has been felt in the North Island of New Zealand, more than 1000 km away from the epicenter.

Raoul island is too far away to experience a destructive shaking. A tsunami was generated with limited wave heights  and was not expected to be dangerous in New Zealand or Tonga.

Understanding this earthquake

The October 21, 2011 Kermadec Islands region earthquake occurred near the Kermadec Trench where the Pacific Plate begins its decent into the mantle beneath the eastern edge of the Australian Plate. At the latitude of this earthquake, the Pacific Plate is converging with Australia in a westward direction at a velocity of approximately 61 mm/yr. The preliminary mechanism and depth of the event suggest it ruptured a reverse fault within the oceanic lithosphere of the Pacific Plate; the initial location indicate a source slightly to the east of the trench, outboard (seaward) of the subduction zone itself, and thus not on the thrust interface between the Pacific and Australian plates.

The October 21 earthquake struck in an oceanic region with few nearby populations, approximately 500 km south of Tonga and 700 km north of New Zealand. This region of the Tonga-Kermadec subduction zone experiences reasonably high levels of seismic activity, with nearly 50 events of M 6.5 and above over the past 38 years, and 5 greater than M 7.5. Two of these, M 7.8 and M8.2 earthquakes on the same day in 1976, occurred just over 100 km west-northwest of todays event; an M7.8 event in 1978 struck nearly 250 km to the southwest, and an M 8.3 event occurred in October 1986, about 80 km to the north. None of these events have recorded damage or casualties.

In July of this year, a M 7.6 event occurred approximately 45 km to the south-southwest of the October 21 earthquake, breaking a normal fault within the subducting Pacific plate also very close to the Kermadec Trench. This event was notable because it triggered a large number of thrust-faulting aftershocks to the west of the plate boundary, on or close to the interface between the Pacific and Australian plates. The October 21 earthquake may be related to that aftershock sequence.


"I Have Felt It" reports as received by Earthquake-Report.com
- We do not expect to receive felt reports for this earthquake


Most important Earthquake Data:
Magnitude : 7.4
UTC Time :  Friday, October 21, 2011 at 17:57:16 UTC
Local time at epicenter : Saturday, October 22, 2011 at 05:57:16 AM at epicenter
Depth (Hypocenter) : 32.9 km
Geo-location(s) :
169 km (105 miles) E of Raoul Island, Kermadec Islands
375 km (233 miles) NE of L'Esperance Rock, Kermadec Islands
877 km (544 miles) S of NUKU`ALOFA, Tonga
1215 km (754 miles) NE of Auckland, New Zealand

Links to important maps
Google satellite map showing the epicenter and the surrounding area.
Historic earthquakes map
Seismic hazard map
Shaking map
Focal mechanism report
Human impact map
GDACS earthquake report
GDACS tsunami report
NOAA tsunami report Pacific
NOAA tsunami report Hawaii
NOAA Information Bulletin Supplement

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I did feel it – Ik heb het gevoeld – Το έκανα αισθάνεται Yo lo he sentido – 我的确感到了 – 私はそれを感じていました- Ich habe es gefühlt – Bunu hissediyorum yaptı – لم أشعر أنه