According to the web site of JR East, because of the earthquake, in Chiba Prefecture,
▼The JR Uchibo Line has stopped working on the up and down traces between Kimitsu Station and Awa-Kamogawa Station.
▼The JR Kururi Line is suspending operations on the inbound and outbound traces between Kururi Station and Kazusa Kameyama Station.
▼The JR Sotobo Line has suspended operation on the up and down traces between Kazusa Ichinomiya Station and Awa Kamogawa Station.
There is not any prospect of reopening any of them.

