Abstract: Apparatus and method for use in holding a cylindrical tank secure and preventing it from being dislodged during an earthquake is disclosed. A pair of mounting brackets are attached to a supporting surface on either side of the cylindrical tank through holes in the mounting brackets by threaded bolts. An adjustable stabilizer bracket is positioned between the cylindrical tank and the supporting wall to keep the cylindrical tank from moving towards the wall. The adjustable stabilizer bracket adjusts to accommodate a variety of different sizes of cylindrical tanks and has angled end portions to conform to the shapes of the different cylindrical tanks. The mounting brackets are pivotally attached to a securing strap, that has a series of holes in it for receiving a bolt. The securing strap is fitted around the cylindrical tank to secure it in place.