Wairarapa News : May 11th 2011
18 WAIRARAPA NEWS, MAY 11, 2011 NEWS for exceptional service WAIRARAPA FUNERAL SERVICES 35 - 37 Lincoln Road, Masterton www.wairarapafunerals.co.nz 3652286AA 3660050AA McKenzies HAVE MOVED For all your Flooring & Drape enquiries, see us at 61 Dixon St Masterton Phone 377 5600 (Beside Beaurepaires) 3660050AA • Hot Water Cylinders • Spouting • Kitchens • Bathrooms • Emergency Work Give us a call for all your maintenance plumbing needs, domestic and commercial. Craig Oakly: P 06 377 5365 M 027 22 66 474 E firstname.lastname@example.org W oaklyplumbing.co.nz 181B Willow Park Drive, RD 11, Masterton 5871 Spouting due for repair? Need a plumber? 3594911AB REGISTERED CERTIFYING PLUMBER Blasts to scan earth's crust Men at work: Denis Brassard, left, shot fire surveyor John McIntyre and GNS scientist Stuart Henrys work on a 50-metre deep hole to measure earthquakes. Half a ton of explosives are being detonated in Wairarapa and Kapiti this week as part of an experiment to understand more about earthquakes. But those keen on watching a fireworks display will be disappointed, as the controlled explosion, one of 12 to go off between Wairarapa and Kapiti, will take place at night 50 metres underground. The experiment is a joint project between GNS Science and Victoria University to help scientists learn more about the tectonic plate boundaries in the lower North Island. GNS Science senior research scientist Stuart Henrys said the explosions were designed to get an image of the crust and will take place in 12 boreholes cased with steel, 50m deep and about 20 centimetres in diameter. Information from the explosions will be recorded by seismographs buried in the ground 100m apart into the back of beyond'', said Mr Henrys. The first borehole the scientists began preparing was on farmland north of Paekakariki, and from there to Wairarapa the boreholes are 8km apart. This week, staff from Orica Mining Services, who have come from Auckland, have been pumping half a tonne of liquid explosives, from their truck, into the bottom 10m of each borehole. Orica's export and business development man- ager Denis Brassard said the explosive, made up of fertiliser and diesel, was similar to mayonnaise, needing an emulsifier, like egg yolk, to keep it together. On top of the explosive, which looks a bit like sticky porridge, the hole is filled with gravel to compress the upward energy released during the blast. The team will detonate each borehole using a GPS clock and standing 100m away between 9pm and 5am from May 10 to May 14. Mr Henrys said the explosions need to happen when it is quiet, with little wind and traffic so the seismographs can receive a clear signal. He described the experiment, which is the biggest to date, as a CAT scan'' of the earth's crust. Each explosion would be like a mini earth- quake'', less than magnitude one, and would not generate any other earthquakes. If you are standing close you will feel the ground shake,'' Mr Henrys said. The team has resource consent and permission from landholders for the bores, which must be 250m from dwellings. The scientists want to record information 25km deep and across 90km to the other side of the North Island. You can think of it as dropping a stone in a pond . . . our receivers are picking up all the wave ripples around the edge of the pond,'' Mr Henrys said.
May 18th 2011