In fact it was not until the
formulation of the theories of Plate Tectonics in the 1950s & 60s that
a full explanation was offered. Great crustal plates move across the Earth's
surface floating on the semi-molten layer below. Where these 'scrape and
grind' together the great earthquake zones - of say Japan and California
But what about Comrie? The
great Highland Boundary Fault which separates the Highlands from the Lowlands
lies just outside Comrie. This fault was highly active 400Myears ago when
Strathearn like much of Britain was a hot dry desert. At that time the Fault
must have been driven by global plate movements. Are the quakes just some
minor settling of this once great fault? Possibly.
The epicentres lie just north
of Comrie while the movement is actually about 15km down. The HBF lies on
the surface just to the south of the town. The HBF is actually very complex
and may slope northward with depth. Alternatively another unknown fault may
exist at depth and be causing the shocks. This theory is supported by many
geologists on the basis that the HBF is inactive elsewhere.
Other places to visit...
St Bean's Church