Specifies the damping factor used to determine the modification (or response compensation) factor.
Source: Seismic Design Standard for the High Pressure Gas Facilities, MITI Notice No. 515 dated Oct. 26, 1981. METI Amended Notice No. 250 dated Nov 29, 2013. High Pressure Gas Safety Institute of Japan (KHK), Seismic Design Guideline for the High Pressure Gas Facilities to the 2012 edition, newest revision Sep 25, 2015.