As shown in photos, severe damages were observed at several facilities in Tsukuba campus, including the infrastructure, especially at the ground—weakened area. KEKB also damaged facility has been under the upgrade stage to SuperKEKB. So works for disassembling of KEKB machine and for remodeling of the equipment were undertaken. Fortunately no one was injured but the situations were quite hazardous. KEKB ring set～13m below the ground also experienced the severe tremors. All expansion points were injured and the cracks on the ceiling/wall/floor were created around the ring, but significant damage such as the tunnel destruction was not observed. Repairs were started, and resumed possible SuperKEKB construction though it will delay 2～3 months.

J-PARC was heavily affected by the March 11 Great East Japan Earthquake. When the earthquake struck, we had a beam study operation of the linac and the machine immediately stopped. We can see subsidence at many places; about 1.5 m over the wide area at the entrance of the linac building, about 50 cm over the area of 1 m×10 m at the main ring building, etc. Underground water is coming into the linac and the main ring tunnels. The water level at the linac reached a depth of 10 cm, but pumping with a diesel generator successfully saved from further flooding. At the RCS, the circulating road went wavy and the yard area for electricity and water devices was heavily distorted. The current status of the J-PARC accelerators after the earthquake is reported.

The Great East Japan Disaster has caused heavy damages on the KEK e⁺/e^- Injector Linac. After two month has passed, part of the Linac was recovered and the beam injection for the PF ring is under testing. This report describes the situation of damages and recovery efforts, some causes enlarging damages and the countermeasures, and the recovery plan for the remaining part of the Linac.

On March 11 2011, a great earthquake struck east region of Japan. The Fukushima nuclear plant has been seriously damaged by the Great East Japan Earthquake, and a large radioactive material was released. We participated in urgent screening activity for people. This report describes the outline of our activity including personal impression.

At KEK, there is a section named Archives Office since 2004. The mission of the Office is for collecting and preserving, as research materials and official documents which are understood to be important from historical point of view. The Office was originally proposed by the former Director General, Hirotaka Sugawara based on his experiences as the manager of the KEK laboratory. In this article, we sketch the activity of the Office.

The 3^rd Accelerator Reliability Workshop (ARW2011) was held in Cape Town, South Africa on April 11-15 sponsored by iThemba LABS. The ARW provides a venue for the accelerator communities to meet and share their experiences on running reliable facilities. The outline of the workshop, including personal impression, is reported.

DIPAC2011 (European Workshop on Beam Diagnostics and Instrumentation for Particle Accelerators 2011) was held at Cap San Diego in Hamburg from 16/May to 18/May in 2011. The number of participants is about 290. We discussed various topics related with the beam diagnostics and instrumentation. After the workshop, many of the participants joined in the DESY tour. In this article, we report the overview of the workshop and the DESY tour as well as several topics presented in the workshop.