[1] Univ Edinburgh, Sch Engn, Edinburgh EH9 3FG, Midlothian, Scotland
[2] Sensors & Software Inc, 1040 Stacey Court, Mississauga, ON L4W 2X8, Canada
[3] Northumbria Univ, Dept Mech & Construct Engn, Newcastle Upon Tyne NE1 8ST, Tyne & Wear, England
[4] Aristotle Univ Thessaloniki, Dept Geophys, Thessaloniki 54124, Greece