Earthquake damage to a laboratory animal facility

Area of Science:

• Laboratory animal science
• Earthquake engineering
• Facility management

Background:

• A magnitude 7.2 earthquake in 1995 caused significant seismic intensity (estimated as 5 on the Japanese Richter scale) at a seven-storey laboratory animal facility.
• While essential utilities like water, gas, and electricity remained largely functional in office areas, structural and equipment damage occurred within the facility.

Purpose of the Study:

• To document the impact of a major seismic event on a laboratory animal facility.
• To describe the countermeasures implemented to enhance facility resilience against earthquakes, including those in place prior to the event.

Main Methods:

• Assessing damage to the seven-storey facility after the 1995 earthquake.
• Evaluating the performance of fixed versus movable cage-racks during seismic activity.
• Reviewing and detailing pre-earthquake mitigation strategies and their effectiveness.

Main Results:

• The earthquake caused damage, including dislodged movable cage-racks in animal rooms and fallen cabinet drawers.
• Floor-fixed cage-racks demonstrated greater stability and sustained minimal damage compared to movable units.
• Essential services such as water, gas, and electricity supplies were largely unaffected in office areas.

Conclusions:

• Laboratory animal facilities require specific seismic mitigation strategies to protect both infrastructure and research continuity.
• Securing movable equipment, such as cage-racks, is crucial for minimizing damage and operational disruption during earthquakes.
• Pre-earthquake planning and implementation of countermeasures are vital for enhancing the seismic resilience of research facilities.