Only small quake needed to trigger landslide, tsunami  In Greenland such a quake caused a tsunami. Could that happen in NZ? That's a very good question.
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7.5 magnitude earthquake strikes near Hanmer Springs in South Island - two killed, Kaikoura isolated, Wellington CBD damaged. See this link Also Helicopter view Over 24 hours later large aftershock affecting Wellington.  Magnitude 7.1 earthquake off East Coast shakes New Zealand North IslandJenlogix Shakemaps show Bay of Plenty and Wellington impact within 1 minute of quakeTeam granted funding to plan response for Alpine Fault megaquakeA megaquake along the Alpine Fault with the potential to "unzip" the South Island happens roughly every 300 years - the last one was in 1717. The Government has put together a team of scientists and civil defence experts to investigate the possible 8.0 magnitude quake, which could tear chasms in the ground, cause landslides, damage state highways and topple cellphone towers. The Ministry of Civil Defence and Emergency Management has granted them $490,000 to create a high-level response plan within two years. For more info see link Also check out Alpine Fault earthquake talk New Wellington Reservoir with Palert Where Wellington hides its water www.stuff.co.nz It holds as much water as an Olympic swimming pool, and can withstand the mightiest earthquake. See the video about how the technology is keeping Wellington's water safe.
Taiwan EarthquakeOur thoughts go out to all those who are suffering the major earthquake in Taiwan this weekend. As can be seen from this site the strength of the shake and aftershocks are greater than the actual 6.4 quake. Click on the link and then the arrow to the side of the quake to see how the earthquake developed. The dots are Palert systems that registered the quake as it happened. http://palert.earth.sinica.edu.tw/  Happy New Year to you all Just a quick reminder about the Intensity V Magnitude of an Earthquake. While there is a correlation it is often not linear. Instruments measure the intensity of an earthquake using Peak ground acceleration (PGA). This is equal to the maximum ground acceleration that occurred during earthquake shaking at a location. Measured in gravity (g) or Gal where 1g=981Gal. The magnitude often using the Moment Magnitude (often mislabelled as Richter) scale is the amount of energy released.   Cliffhanger part of Earthquake Shakemap Trial in Wellington.
The house in Wellington featured on New Zealand Grand Design - and hanging OFF the 45 degrees cliff face - is one of a number of sites in the area that have the low cost Palert system installed. Connected back to a secure central server the Palerts provide data to enable shake maps to be produced within seconds of an event. These are the initial units to be deployed and will eventually be part of a more sophisticated early warning system. The house hangs from the cliff face and as such the units showed there is a very small strain on the foundation of under 0.2 gal (ground acceleration). Not surprising as most of the house hangs out over the cliff. An amazing piece of engineering. For more information on the house see :- Grand Designs cliff-hanger creates prototype for steep sites New Zealand Earthquake warning system trial
An earthquake early warning system that provides a precious cushion of reaction time before the destructive shaking arrives is being trialled in the Western Bay of Plenty. |
Jenlogix and San LienEarthquake Warning Systems Archives
February 2019
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