#
    # Random earthquake effect when units move.
    #

    [event]
        name=moveto
        first_time_only=no

        [lua]
            code= <<
                local rumble_seed = safe_random("1..100")

                if rumble_seed % 11 == 0 then -- 9.09% chance
                    wesnoth.wml_actions.sound({ name = "cave-in.ogg,cave-in.ogg,rumble.ogg" })
                end

                if rumble_seed % 13 == 0 then -- 7.69% chance
                    wesnoth.wml_actions.quake({ sound = "cave-in.ogg" })
                end

                if rumble_seed % 29 == 0 then -- 3.44% chance
                    wesnoth.wml_actions.quake({ sound = "rumble.ogg" })
                end
            >>
        [/lua]

        [allow_undo][/allow_undo]
    [/event]