Initiatives on Seismic Countermeasures
Establishing Earthquake Resistance Standards to Judge Whether to Acquire Properties or Not
Interest in the earthquake resistance of buildings has been growing even higher since the Great East Japan Earthquake (2011).
In preparation for earthquake risks, JPR will not acquire properties that do not meet certain earthquake resistance standards.
Using PML Values in Preparation for Earthquake Risks
PML represents Probable Maximum Loss, or the maximum amount of loss by earthquakes.
PML indicates the degree of damage to a building caused by an assumed earthquake of maximum magnitude (that could happen once every 475 years), presented as the proportion (%) of the expected restoring cost against the price to re-acquire the building (replacement cost). The lower the percentage is, the lower the amount of loss becomes. JPR checks the earthquake resistance performance and the PML value when determining whether to acquire a property or not, and will not acquire it if the property does not meet certain standards. For the earthquake resistance performance and the PML value of individual properties in the portfolio, please check the Property Data Book.
Shakes by the Great East Japan Earthquake Attenuated at Shinjuku Center Bldg.
Supported by Taisei Corporation, the sole general contractor among sponsors of J-REITs, JPR installed 288 "axial force controlling oil dampers" at Shinjuku Center Building in 2009. The installation represented the first countermeasure against long-period earthquake ground motion for existing ultra-skyscraper buildings in Japan.
When the Great East Japan Earthquake broke out, this countermeasure minimized the damage to the building, reducing maximum distortion by 22% and maximum acceleration by 29%.
Countermeasures against Long-Period Earthquake Ground Motion Won the 20th BELCA Award
BELCA (Building and Equipment Long-Life Cycle Association) Award is a program to select and recognize particularly superb buildings and structures among those that are properly repaired and maintained or have undergone excellent renovation work. Shinjuku Center Bldg. won the 20th BELCA Award (in the long life domain).
Countermeasures against Long-Period Earthquake Ground Motion Minimize Damages
When the Tohoku Region Pacific Coast Earthquake occurred, the long-period earthquake ground motion that was generated at the epicenter attacked Shinjuku, far from the center of the earthquake. At TOH-TEN-KOH, a restaurant on the top floor of Shinjuku Center Bldg., however, there was no damage other than a broken dish. This exemplifies how effectively the countermeasures taken in advance minimized damages.