G_L Regions

The globe is broken down into regions based on geographic and politcal boundaries. Each region is assigned a unique number.
The boundaries of these regions are defined at one-degree intervals.
The Flinn-Engdahl (F_E) seismic and geographical regionalization scheme was proposed in 1965, defined in 1974 and revised in 1995.
After the 1995 revision there are 754 F-E regions, subsequently numbered from 1 to 757 with three gaps (172, 299 and 550) at dissolved regions.
The regions are grouped into 50 larger seismic regions.
Under the F_E system New Zealand is known as Region 11
subdivided into;
158 – off W coast of North Island.
159 – North Island
160 – off E coast of North Island.
161 – off W coast of South Island.
162 – South Island
163 – Cook Strait
164 – off E coast of South Island.
165 – north of Macquarie Island.
166 – Auckland Islands
167 – Macquarie Island
168 – south of New Zealand

Due to the comprehensive data available from Geonet/GNS and the development of new computer programs since this Blog started, it has become necessary to re-define the New Zealand Regions further.
The G_L sub- regions are designated based on thousands of earthquake epi-centers located over the last 3 years, actual physical geology and locally known regional divisions, divided primarily into half degree latitude sections.
They are not intended to replace the F_E numbers but further define F_E Regions 160, 159, 163, and 162.
Numbering these sub regions allows more precise calculations of energy released (or locked in) and other data processing.

The parameters of each G_L Region are marked on the Development Map below, click inside the coloured rectangles and a popup tag will appear with the G_L number and name , sub-region number and name and the co-ordinates of the area. The polygons may change shape as the project develops and as more information is analyized

4 Comments to “G_L Regions”

  1. Nice one. I did not realise you had put this on the blog already. I will try and catch up with this today!

  2. Yep, I started on breaking them down into individual areas but from seeing what you did with the popup tags I don’t think I’ll bother with that now.

  3. Hi, D. this is very interesting thanks! I wonder if I should augment my FE lookup db with this info, or if, for us N.Americans, staying in sync w/USGS is best. Is there a file that contains these refinements, but in the format generally used by the FE lookup files? (I know, vague, I haven’t looked at that code in years and can’t recall what format is used by my code to lookup FE regions)…..

  4. Hi Rosswell, I have no idea what the format used by the FE lookup files is myself.

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