There are many leaning trees in the area of Greenough near Geraldton Western Australia, which have grown like this because of the prevailing southerly winds. You might read online that it is not the actual wind that pushes them over but the salt in the air that the tree tries to grow away from, which does not make sense. You may think that there are many places that have strong prevailing winds that do not cause such leaning trees. In this case, it is probably a combination of the regular winds, plus the loose sandy soil and root system of these trees that results in this pattern. Whatever the cause, it is a very interesting phenomenon and worth a stop to look at if you are driving up the west coast of Australia.