about halfway down the document showing how earthquake waves are refracted through the Earth.
There is a hypothesis in planetary geology about large impacts on one sid of a body being focussed at the other side and causing disruptions. This is based on observing the position of large craters and features on their antipodes. I don't think the Manchester quakes are in that class.
By clicking on the User Name, you will requery the forum for that user. You will see everything that he or she has posted with that Mudcat name.
By clicking on the Thread Name, you will be sent to the Forum on that thread as if you selected it from the main Mudcat Forum page.
By clicking on the Subject, you will also go to the thread as if you selected it from the original Forum page, but also go directly to that particular message.
By clicking on the Date (Posted), you will dig out every message posted that day.
sj