Dear @mermaidquake, welcome on LastQuakers and thank you for your question. Actually the grid is an artefact and we explain why here : La Palma - grid
If you want to see a more precise map you can check the local authorities. So please be assured that there is no risk of super tsunami which would threat americans or any other citizen from other nationality. Even if the EMSC map looks, indeed, weird, this rumour is not true and these earthquakes are linked to the volcano activity and totally natural.
I hope this helps and reassure.
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