Normal fault. When stress splits the Earth's crust apart, the fate of the hanging wall rests on the movement of underlying rock. With the first rift, a single continuous strata is suddenly pulled in two.
They are asking him to travel for work; to do an 'on site visit' with a client. For the first time our hero's choices are not his own. He is a programmer by trade and the people around him don't understand enough of what he does to interfere with his coding. But they do understand enough of what he does to control him with criticism and endless changes. He is hung up in a system that he can't program. Inside the software he manipulates infinities; outside his power rests on personal opinion and market data.