What do we record?

Our current project has two main stages. The first is to record small earthquakes associated with the natural cracking of the oceanic crust, and the second is to undertake imaging in 3D of the structure of the entire region within a box. The latter is equivalent to having a body scan in a hospital and we use man-made sound signals to do the imaging.

The instruments we recovered in October 2014 had recorded, after 6 months of listening, almost quarter of a million individual cracking events. That’s almost 1250 a day.

As the picture above shows, each single crack was heard by each of the 25 seismographs on the seabed and we can use these recording to work out where the event occurred, both laterally and with depth below the surface. Mapping the 3D location of all of these events will mark out where the fault planes are, which are moving. Clever eh?

We also recorded large, global earthquakes during this period which are significantly larger in amplitude that the events local to 13N.

gather.71.ch0.line2014_235.segy

This is an example global earthquake as it travelled past an instrument located within the 13N array.

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