There are a lot of volcanoes,mostly along the pacific ring of fire,mt Fuji in Japan,for example
https://www.reference.com/science/volcanoes-located-along-convergent-plate-boundaries-902a6027f2e299f1#
the link has got more example,you might want to check it out
hope it helps c:
I will say distance from the sea, ocean currents, direction of prevailing winds
Iron was able to show previous orentations of earth's magnetic field
A the log sinks into the water
You won't notice much at sea. Maybe a slight change in sea level.
Closer to the land though, water will draw away from the land maybe leaving the sea floor exposed. Then it will surge back in, flooding the land and inundating the coastal area.
