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What Happens When a Major Earthquake Strikes a Large City?

Essential Earthquake Preparedness for Business Continuity

Earthquakes can occur in many parts of the world, but when a major earthquake strikes a densely populated metropolitan area, the consequences extend far beyond damaged buildings.

Large cities are the hubs of business operations, transportation networks, supply chains, telecommunications, and financial services. Even organizations that experience little direct damage can face significant disruption due to infrastructure failures, employee safety concerns, and interruptions across the broader business ecosystem.

Large cities are the hubs ofbusiness operations, transportation networks, supply chains, terecommunications and finacial services.

For corporate risk managers, business continuity planners, and management teams, understanding these risks is a critical part of Disaster Risk Reduction (DRR) and corporate resilience planning.

In this article, we explore what happens when a major earthquake impacts a large city, how it can affect business operations, why insurance alone may not be enough, and what practical earthquake preparedness measures organizations can implement today. We also discuss solutions suitable for large enterprises, small and medium-sized businesses, retail stores, and even households.

What Makes an Urban Earthquake Different?

An earthquake occurring beneath or near a major metropolitan area presents unique challenges compared with earthquakes in less populated regions.

Cities concentrate people, businesses, public services, transportation infrastructure, and critical utilities within a relatively small geographic area. As a result, even moderate physical damage can create widespread economic and operational disruption. Potential impacts include:

  • ・Temporary closure of offices and facilities
  • ・Transportation network disruptions
  • ・Communication outages
  • ・Delayed deliveries and logistics services
  • ・Supply chain interruptions
  • ・Reduced access to customers and suppliers
  • ・Increased challenges in employee mobility and safety

In modern cities, economic activity is closely interconnected. Damage affecting one sector can quickly influence many others.

Cities concentrrated people, business, public services, transportation infrastructureand critical utilities.

How Can a Major Earthquake Affect Business Operations?

Employee Safety Risks from Falling and Toppling Objects

One of the most immediate workplace hazards during an earthquake is the movement of unsecured furniture, equipment, and inventory. Common risks include:

  • ・Filing cabinets tipping over
  • ・Shelving units collapsing
  • ・Large displays falling
  • ・Servers and IT equipment shifting
  • ・Office equipment moving unexpectedly
  • ・Merchandise falling from retail shelves

These incidents can result in injuries, damage to valuable assets, and extended operational downtime. For this reason, fall prevention and tip-over prevention measures are often among the first priorities in office disaster preparedness programs.

Aftermath of an earthquake in the office.

Business Interruption and Operational Downtime

Even if a building remains structurally sound, companies may experience significant operational disruption. Potential consequences include:

  • ・Damaged computers and monitors
  • ・Network and communication failures
  • ・Unusable office spaces
  • ・Inventory losses
  • ・Equipment malfunction
  • ・Delays in customer service

Business Continuity Planning (BCP) is not only about recovering after a disaster. It is also about reducing the likelihood that critical business assets will be damaged in the first place. Organizations that proactively implement earthquake countermeasures are often better positioned to resume operations more quickly after an event.

Communication failure will be expected after an earthquake.

Transportation and Logistics Disruptions

Large cities rely heavily on transportation infrastructure. Following a major earthquake, businesses may face:

  • ・Highway closures
  • ・Rail service interruptions
  • ・Airport disruptions
  • ・Port delays
  • ・Fuel distribution challenges

Even companies whose offices remain fully operational may experience difficulties receiving materials or delivering products. This is why DRR strategies increasingly focus not only on internal risks, but also on supply chain resilience and partner dependency analysis.

Transportation and logistics disruptions cause troubles in supplying marchandise.

Long-Period Ground Motion: A Less Visible Urban Risk

In cities with high-rise buildings, another concern is long-period ground motion. Unlike the sharp shaking commonly associated with earthquakes, long-period ground motion creates slow, large-amplitude swaying that can continue for an extended period. This movement can significantly affect tall buildings, causing furniture, office equipment, and stored materials to move even when structural damage is limited.

Organizations operating in:

  • ・High-rise office towers
  • ・Mixed-use skyscrapers
  • ・Urban commercial complexes

should consider this risk when developing earthquake preparedness plans. For a more detailed explanation of this phenomenon, readers can refer to our article on Long-Period Seismic Motion, which explores the subject in greater depth.

Is Earthquake Insurance Enough?

Insurance plays an important role in risk management. However, insurance primarily addresses financial recovery after losses occur. It may not fully address:

  • ・Employee injuries
  • ・Lost productivity
  • ・Interrupted customer relationships
  • ・Delayed projects
  • ・Supply chain disruptions
  • ・Reputational impacts

For this reason, many organizations view insurance as only one component of a broader earthquake preparedness strategy. A balanced approach combines risk transfer through insurance (compensation) with proactive measures (prevention) that help reduce damage before it occurs.

Insurance alone is not enough. The combine both compensation and prevention is the key to survive.

Practical Earthquake Countermeasures for Businesses

Improve Tip-Over and Fall Prevention

A practical starting point is identifying equipment and furnishings that could become hazards during strong shaking. Consider evaluating:

  • ・Cabinets and storage units
  • ・Server racks
  • ・Office electronics
  • ・Display equipment
  • ・Retail shelving
  • ・Manufacturing equipment

Securing these assets can help protect both people and operations.

Choose Solutions That Minimize Business Disruption

Many organizations face challenges when implementing seismic safety improvements. Common concerns include:

  • ・Restrictions on drilling into walls or floors
  • ・Leased office space limitations
  • ・Operational downtime during installation
  • ・Future relocation or equipment replacement

For these situations, non-invasive earthquake protection solutions may be worth considering. For example, Pro7 seismic protection systems offer:

  • ・No drilling into walls, floors, or protected equipment
  • ・Easy removal when equipment is relocated or replaced
  • ・No construction work required
  • ・Installation while facilities remain in operation

These characteristics can help organizations improve office safety without major facility modifications. The Products have also been tested under conditions equivalent to JMA Seismic Intensity Scale 7, representing very strong earthquake shaking.

No drilling required

Earthquake Preparedness for Small Businesses and Retail Stores

Earthquake resilience is often associated with large corporations. However, small and medium-sized businesses may be especially vulnerable to operational interruptions.

Practical measures for smaller organizations include:

  • ・Securing merchandise displays
  • ・Stabilizing point-of-sale equipment
  • ・Implementing fall prevention measures for shelves
  • ・Protecting computers and communication devices
  • ・Maintaining emergency supplies
  • ・Establishing emergency contact procedures

Many of these actions can be implemented gradually and at relatively low cost. For organizations with limited resources, prioritizing life safety and critical operational assets is often a sensible first step.

small and medium-sized businesses may be especially vulnerable to operational interruptions.

Integrating Earthquake Preparedness into DRR and Corporate Resilience

Earthquake preparedness should not be treated as a standalone safety initiative. It is most effective when integrated into broader DRR (Disaster Risk Reduction), corporate resilience, and business continuity planning efforts.

Organizations should consider:

  • ・Employee safety procedures
  • ・Asset protection strategies
  • ・Emergency communications
  • ・Remote work capabilities
  • ・Supply chain resilience
  • ・Facility recovery plans

A comprehensive approach helps create a stronger foundation for responding to a wide range of natural disasters, not just earthquakes.

A comprehensive approach helps Disaster Risk Reduction.

Conclusion

When a major earthquake strikes a large city, the effects often extend far beyond the initial shaking. Businesses may face employee safety challenges, operational disruption, transportation delays, supply chain interruptions, and financial losses.

While insurance remains an important part of risk management, it is only one piece of the equation. Proactive earthquake countermeasures such as tip-over prevention, fall prevention, asset protection, and office disaster preparedness can help reduce risks before a disaster occurs.

Whether your organization is a multinational corporation, a medium-sized company, a local retailer, or a small business, taking practical steps today can improve resilience and support business continuity in the future.

The same principle applies at home. Households should also consider securing furniture, using anti-slip or seismic pads where appropriate, maintaining emergency supplies, and discussing family emergency plans in advance.

Preparedness is not only about protecting property – it is about protecting people and maintaining continuity when it matters most.

Is Your Workplace Prepared for the Next Major Earthquake?

Protecting people, equipment, and business operations starts with effective earthquake preparedness. Our seismic protection solutions help organizations improve tip-over prevention, fall prevention, and office disaster preparedness without drilling into walls, floors, or protected equipment. Installation can be completed without construction work and without interrupting normal operations, making implementation easier for offices, retail stores, and other commercial environments.

If you are reviewing your DRR strategy, BCP initiatives, or workplace earthquake countermeasures, explore our product solutions and learn how practical seismic protection can help strengthen your organization’s resilience.

Visit our product pages or contact us today to discuss earthquake protection options for your workplace.