Thanks Julia for following my steps :-)
I did not find the scenario that difficult, but It was fun ride because It was thematically great. The rails were washed out, the earth was shaking... I did feel the thread of the earthquakes. Somehow I like to think that a shudde Mell game without surges is not exciting :-). .
As I matter of fact I checked the next 5 mythos cards after winning the scenario and they were opening gates at 5 different places, so I do not think I would have lost due to Earthquake.
Cheers
Enric