Abstract
This paper presents the damage situation of telecommunication infrastructure facilities of Nippon Telegraph and Telephone CORP. due to the Great East Japan Earthquake. The analysis on tendency of suffered damages and the examination on validity of the earthquake-proof measures implemented so far are also reported. In comparison with the Kobe earthquake, it turned out that damage ratio of facilities due to earthquake motion and ground deformation, except tsunami damage, which occurred by the Great East Japan Earthquake was smaller. Moreover, we examined the possibility to detect weak points using the ground information currently released, supposing a metropolitan epicentral earthquake and the Tokai, Tonankai and Nankai earthquake.
