SAFETY AND SECURITY

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Safety and Security – Disaster Management in Marunouchi Area –

After the Tohoku Earthquake in March 2011, the safety and security of the city has been a growing concern. Mitsubishi Estate Group is further reinforcing its disaster management in the Marunouchi Area, independently and by cooperating with tenants and the local government.

Disaster-Resistant Characteristics of the Marunouchi Area

One of the Lowest-Risk Areas in Tokyo

Among the damaging results triggered by natural disasters, fire and soil liquefaction are the major risks in many urban areas of Tokyo. Fires caused by quakes break out simultaneously, making them especially difficult to respond to and extinguish. However, the Marunouchi Area is one of the areas with lowest risks of building destruction, earthquake-caused fires, and liquefaction.

Highly Stable and Secure Energy Supply

The interruption of power supplies can cause major problems for businesses operations. However, the Marunouchi Area boasts a very stable and secure supply of power.

The risk of blackouts is minimalized by adopting an auxiliary power line. City gas is carried through extremely seismic-resistant intermediate pressure pipelines, which remained intact despite two devastating earthquakes: the Great Hanshin earthquake in 1995 and the Tohoku Earthquake in 2011. Many buildings in the area are also supplied with steam and chilled water necessary for air-conditioning, by the "district heating-cooling system," operated by Marunouchi Heat Supply Co., LTD., a member of Mitsubishi Estate Group. The system uses bilateral power lines supplied from multiple substations. In addition to the high seismic-resistance, specialized operators are on duty twenty-four seven, ensuring a swift and appropriate response in times of emergency.

Advanced Information Network

Marunouchi Direct Access, a member of Mitsubishi Estate Group, supplies the area with an extensive fiber-optic network. It also operates the highly-stable "Marunouchi Data Center," equipped with emergency generators and UPS (uninterruptible power supply), protecting servers from possible sudden power failure from a natural disaster.

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High Seismic Performance

The Original Seismic Design Standard

All the buildings that Mitsubishi Estate owns meet or surpass the requirements of the revised seismic design code, including those built before the previous code in 1981. All super high-rise buildings constructed post 2002, such as the Marunouchi Building, exceed the minimal seismic performance by 1.5 times. In such buildings, workers and visitors can remain in the building, even in the event of an earthquake equivalent to the Great Hanshin Earthquake of 1995. Furthermore, the Marunouchi Building and other high-rise buildings constructed subsequently, adopt a seismic damping structure to alleviate the building' s tremors.

Other Disaster-Preparatory Facilities

All the buildings in Marunouchi Area are equipped with an emergency power generator that operates in the case of a blackout. Flood prevention plates are also installed to prevent the infiltration of water into the building. However, possible suspension of water supply is a major concern. To combat this, water stored in each building can be used to maintain the business continuity and the Marunouchi Building and subsequently constructed buildings have a water purification facility, enabling kitchen wastewater, well water, and rainwater to be reused as flushing water. Moreover, certain buildings designated as a disaster management facility are installed with emergency well and filtering instruments for the production of safe drinking water.

Picture: Seismic Damping Device

Seismic Damping Device

Picture: Emergency Power Generator

Emergency Power Generator

Cooperation with the Local Government and Community

In partnership with the other landowners of the Marunouchi Area and Tokyo Metropolitan Government, Chiyoda Ward, and JR East, Mitsubishi Estate Group established a guideline for the development of the area. Under the public-private partnership, Mitsubishi Estate conducts a comprehensive urban development program which covers the construction of individual buildings, infrastructure development, crime prevention, and management of public space and pathways.

As for disaster management, in addition to the annual disaster drills in each building imposed by the law, Mitsubishi Estate Group holds an annual extensive drill in September that takes place in the whole Marunouchi Area in cooperation with Marunouchi Fire Department. This drill has been a tradition since 1926, three years after the Great Kanto Earthquake hit the area.

Picture: Annual extensive drill in the whole area.

Annual extensive drill in the whole Marunouchi area

Mitsubishi Estate Group takes precautions for evacuees and those who cannot return home due to the suspension of public transportation. Chiyoda Ward is estimated to have about 600,000 potential evacuees and people who may have difficulty returning home. Mitsubishi Estate Group has also formed an agreement with Chiyoda Ward, and has prepared food and other emergency supplies and provides visitors with the latest information using 80 monitors installed in the area. In addition, St. Luke's MediLocus, a branch clinic of St. Luke's International Hospital, is located in Otemachi Financial City that opened in October 2012. Accepting patients in Japanese and English, St. Luke's MediLocus and Mitsubishi Estate Group cooperate in case of emergency.

Mitsubishi Estate Group will further pursue for superior safety and security and make the Marunouchi Area even more appealing, through the development of buildings with high seismic performance, cooperation with the local government and community, and facilities to ensure the business continuity.

Picture: Monitor displaying NHK news program in the case of emergency (photo from Mar. 11, 2011)

Monitor displaying NHK news program in the case of emergency (photo from Mar. 11, 2011)

Picture: On March 11, 2011, the day of the Great Tohoku Earthquake, Mitsubishi Estate Group accommodated more the total of than 3,500 evacuees in 10 buildings in Marunouchi and Yokohama.

On March 11, 2011, the day of the Great Tohoku Earthquake, Mitsubishi Estate Group accommodated more the total of than 3,500 evacuees in 10 buildings in Marunouchi and Yokohama.

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