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201207031036A OFF W. COAST OF N. ISLAND NEW ZEALAND
Date: 2012/ 7/ 3 Centroid Time: 10:36:20.2 GMT
Lat= -40.00 Lon= 173.67
Depth=229.9 Half duration= 3.5
Centroid time minus hypocenter time: 4.2
Moment Tensor: Expo=25 0.282 0.842 -1.120 2.850 -2.110 0.263
Mw = 6.3 mb = 0.0 Ms = 6.2 Scalar Moment = 3.69e+25
Fault plane: strike=32 dip=16 slip=173
Fault plane: strike=128 dip=88 slip=74
2012 7 3 10 36 24.0 -40.25 174.25 33.0 6.1 COOK STRAIT, NEW ZEALAND
See how your smaller Aqua icons are not as sharp as the Orange ones.
4.8 2012/07/04 00:04:00 -59.126 148.972 10.3 WEST OF MACQUARIE ISLAND
2012 7 4 0 4 0.0 -59.00 149.00 33.0 5.5 WEST OF MACQUARIE ISLAND
usgs 11/04/2012 14:32 6.1 Off W. Coast Of Northern Sumatra
usgs 11/04/2012 14:40 6 Off W. Coast Of Northern Sumatra
usgs 11/04/2012 14:46 6 Offshore Taitung City. Taiwan
Originally posted by PuterMan
Happy Independence Day
Watch out for the UFOs. Quite why anyone would wish for independence from the Crown I cannot imagine
Science 29 June 2012:
Vol. 336 no. 6089 pp. 1690-1693
Major Earthquakes Occur Regularly on an Isolated Plate Boundary Fault
1. Kelvin R. Berryman1,*,
2. Ursula A. Cochran1,
3. Kate J. Clark1,
4. Glenn P. Biasi2,
5. Robert M. Langridge1,
6. Pilar Villamor1
- Author Affiliations
1GNS Science, Post Office Box 30-368, Lower Hutt 5040, New Zealand.
2Seismological Laboratory, University of Nevada-Reno, Reno, NV 89557, USA.
1. ↵*To whom correspondence should be addressed E-mail: email@example.com
The scarcity of long geological records of major earthquakes, on different types of faults, makes testing hypotheses of regular versus random or clustered earthquake recurrence behavior difficult. We provide a fault-proximal major earthquake record spanning 8000 years on the strike-slip Alpine Fault in New Zealand. Cyclic stratigraphy at Hokuri Creek suggests that the fault ruptured to the surface 24 times, and event ages yield a 0.33 coefficient of variation in recurrence interval. We associate this near-regular earthquake recurrence with a geometrically simple strike-slip fault, with high slip rate, accommodating a high proportion of plate boundary motion that works in isolation from other faults. We propose that it is valid to apply time-dependent earthquake recurrence models for seismic hazard estimation to similar faults worldwide.
* Received for publication 10 January 2012.
* Accepted for publication 4 May 2012.
The investigation found the mean interval between large earthquakes on the fault is 330 years and two thirds of the intervals were between 260 and 400 years. As with many natural systems, there was a spread of intervals with the longest being about 510 years and the shortest about 140 years.
The Alpine Fault extends about 600km along the spine of the South Island between Milford Sound and Marlborough. When it ruptures, it produces an earthquake of about magnitude 8.0.
Based on this research, scientists have estimated there is a 30% probability of a large earthquake on the Alpine Fault in the next 50 years. This is at the higher end of existing estimates, which were based on only the last four large quakes on the fault. Scientists have more confidence in this new estimate as it is based on a much longer earthquake record.
For project co-leader Ursula Cochran, also of GNS Science, the long earthquake record they uncovered highlighted the inevitability of a major earthquake occurring on the southern section of the Alpine Fault in the future.
“The last earthquake occurred about 295 years ago, so there is no better time than the present to prepare for the next one,” Dr Cochran said.
At the household level, these measures include emergency kits, anchoring furniture, removal of old-style chimneys, and family communication plans. At the local community level, measures could include planning for the care of the elderly and young if the community is isolated, and identifying skills and equipment helpful in a disaster.
Auckland University professor of biostatistics Thomas Lumley said that using the numbers in the paper, “I get 32% chance at 50 years, and 50% chance at about 80 years”.
“The risks are high, but that’s because it seems to be an unusually regular fault.”
Long earthquake records have been obtained from only about four other faults around the world, including the San Andreas Fault, in California. The latest findings underpin an idea over 100 years old — that some faults might rupture regularly, rather than at
random or in clusters.
Other faults that have similar characteristics to the Alpine Fault include sections of the North Anatolian Fault, in Turkey, and the Denali Fault, in Alaska.
THE VALLEY, Anguilla (AP) -- An earthquake has shaken the tiny Caribbean island of Anguilla. There are no reports of injuries or damage.
The U.S. Geological Survey reports the quake's preliminary magnitude as 5.1 and says the epicenter was about 6 miles (10 kilometers) east-southeast of Anguilla's capital, The Valley. But it says the quake occurred far below the surface, about 55 miles (88 kilometers) down - a depth that tends to lessen the power of a tremor's shaking.
Police constable Terry Sylvester tells The Associated Press that it was the strongest earthquake he has ever felt but says residents have not reported any damage.
© 2012 The Associated Press