I have been watching the area south of me (New Zealand) for a few years now for earthquakes, anything south of -46.0 I call the Southern Ocean or
I have the Global Live Internet Seismic Server (LISS) station SNZO Seismogram page set as my homepage on Firefox, so everytime I open up I can see
whats going on around our area.
So yesterday when I opened up there was a bit of action going on, looked like quite a big quake that lasted a long time, at least an hour
What was interseting was the two pulses within the main wave.
So the next step (when there is something worth looking further into) is to check the USGS list and see where they were at.
So I go to
The page will keep rolling over as time goes on so I took a screenshot of the day n question
As you can see there were in fact two quakes within a minute of each other but quite a ways apart
6.4 Burma-India Border
The reason the two waves seem the same siz is because of the distance from SNZO, Vanuatu being closer.
The next step is to see what other stations on the LISS are showing at that time. For those not familar with the LISS network the stations are shown
on this map page
I again took screenshots of some of the stations in the Austalasian area, and have marked identifiable quakes from the USGS list with the distance of
each quake from the station, and how long it took the P wave to reach the station (taken from Phase Arrival data available under Sceintific and
Technical tab on each individual USGS quake page). In some cases I had to use other Networks to get this info
EMSC European-Mediterranean Seismological Centre
GFZ German Research Centre for Geosciences
As you can see the stations start to show quite clearly that there were two individual quakes.
once the stations get closer to Vanuatu the two meld together
and back to SNZO now with the quakes ID'd
Now, you may be wondering what the signals that have a red circle around them are?
Well I don't know
they don't match up with anything on any lists time wise, including Geonet and Geoscience Australia.
I think there is a lot more going on in the Southern Ocean and Antarctica/Antarctic Plate than the people who are supposed to be monitoring these
thngs are letting on.
some other sources I used to compile the graph tags
Time Difference Calculator
Calculate distance between Latitude/Longitude points
edit on 5-2-2011 by muzzy because: (no reason given)