Some of the deadliest natural disasters in modern records have been earthquakes. One of the scariest aspects of an earthquake is how quickly it happens. Because earthquakes provide little warning, resilient construction is one of the most practical ways to prepare. The right earthquake-resistant construction techniques help a building absorb, redirect, and survive shaking forces before they cause structural failure.

How Frequent Are Earthquakes?

Every day around the world, more than 55 earthquakes occur. Luckily, the vast majority of these 20,000 annual earthquakes are so small that they are hard to notice. Only about 16 earthquakes each year end up being considered major, with magnitudes greater than a magnitude 7. Earthquakes of those magnitudes can cause incredible damage and should be taken very seriously.

Although many readers still say “Richter scale,” modern earthquake reporting often uses magnitude measures such as moment magnitude. The table below uses common earthquake magnitude ranges to show why earthquake-resistant construction techniques matter before the ground starts moving.

Actual damage can vary by distance from the epicenter, surface material, local intensity, and the way a building is designed.

Why Seismic Zones and Site Selection Matter

Where a building is constructed affects how it performs during an earthquake. Seismic zones, proximity to active faults, slope conditions, and soil type all influence how much shaking reaches the structure. Bedrock generally provides a more stable base, while deep soft soils can amplify shaking and increase the chance of settlement or liquefaction.

That makes the site part of the seismic strategy, not just the wall system. High-risk regions such as California, Alaska, and the Pacific Northwest require seismic design that accounts for local hazard maps, soil behavior, and adopted codes. For homeowners, an earthquake-resistant home begins with both site awareness and material selection, and the same resilience principles apply to broader planning for resilient homes.

Building Codes That Guide Earthquake Construction

Earthquake construction in the United States is guided by adopted building codes and engineering standards. The International Building Code (IBC), ASCE 7, and ACI 318 help engineers account for seismic loads, site conditions, reinforced concrete design, structural systems, and continuous load paths. Together, these standards help engineers translate seismic risk into specific structural and connection requirements, which are also part of broader resilient building design.

How Can a Building Be Earthquake-Resistant?

Since earthquakes literally shake a structure back and forth, the key to building a resilient structure is designing the building to transfer those shaking loads to the foundation as quickly as possible. Buildings that cannot transfer those loads quickly have to be strong enough to take the beating or they will crumble. A building becomes earthquake-resistant when the roof, floors, walls, and foundation work together as a continuous load path with enough strength, stiffness, and ductility to resist brittle failure.

What Techniques Lead to an Earthquake-Resistant Structure?

When an earthquake hits, the structures that survive have three characteristics in common: they are stiff, strong, and ductile. These are the most common features that give a building these characteristics. Many buildings use a combination of these features to ensure a building is still standing even after a big one hits. The best earthquake-resistant construction techniques usually work together rather than relying on one isolated feature.

Avoid Columns on the Ground Floor

Many multistory structures utilize the ground floor as a parking garage or have a living area with many open areas. While aesthetically pleasing or functional, those designs tend to have worse outcomes when an earthquake hits. The columns may not withstand the shaking if the first story is not properly designed for lateral loads. That weak first level is often called a soft-story condition, and it can concentrate lateral movement where the structure needs strength most.

Dampen the Shock

In the same way that shock absorbers are key to offroad and bumpy driving, shock absorbers can be used to minimize the impact of earthquakes on buildings too.

When used on a building, shock absorbers are typically added to each floor of a building. The shock absorbers help to dissipate the shaking energy from an earthquake, so that the building’s structure doesn’t have to redirect all of the force back to the building’s foundation.

Shear Walls

Buildings are constructed to support the weight of a building from gravity. When an earthquake hits, the forces on the building start to change direction which can be disastrous if the building cannot handle those loads. Shear walls are designed specifically to handle these loads, and are often made from diagonal steel cross braces. Shear walls can support the compression and tension that occurs during an earthquake and push those loads to the building’s foundation.

Go With the Flow

For skyscrapers, a popular technique is to use a pendulum that moves opposite the earthquake’s movements to dissipate the energy. These systems are engineering marvels that utilize a large ball suspended from steel cables that connect to a hydraulic system at the top of the building. Moving against the earthquake helps keep the entire structure stable even when the ground is shaking.

Diaphragms

Integral to horizontal structures, diaphragms are designed to distribute sideways forces that occur during an earthquake. These features are built into floors and the roof to connect to the building’s vertical elements. The diaphragms also help to absorb stress and torsion from the building during twisting.

Reinforced Concrete

Properly designed steel-reinforced concrete structures can perform very well during intense earthquakes. Unreinforced concrete buildings are another story. The shaking from an earthquake will cause concrete to crack and crumble unless it has steel to reinforce and strengthen it.

The steel in the concrete pulls double duty: it makes the wall more ductile and also anchors the wall to the foundation. This anchoring helps make the wall an effective shear wall, allowing it to redirect shaking forces into the building’s foundation. Fox Blocks also explains the broader ICF construction pros and cons that matter beyond seismic performance.

Strong Connections

Reinforced concrete can create a strong connection between the walls and foundation when it is properly detailed and constructed. Wood frame construction is incredibly ductile but must be properly anchored to the foundation. If the connections between the wall and foundation are weak, the building can move and shift during an earthquake.

Floating Foundation

The opposite of a strong connection is to completely separate the foundation from a building’s superstructure. This type of modern approach works incredibly well because it allows the ground to shake and move without disturbing the building itself. This is possible due to massive lead-rubber bearings with solid lead cores. The bearings act to isolate the building from the foundation while still providing a strong connection to support the building. This strategy is often called base isolation because it reduces the transfer of ground motion into the building above.

Insulated Concrete Blocks

The NRMCA and the US Resiliency Council published an earthquake performance comparison of building materials for multi-story buildings in high seismic zones. The modeled ICF building configuration was expected to receive a Gold or Platinum rating compared with other building materials such as wood, cross-laminated timber, and steel.

ICF construction supports earthquake resistant construction because the reinforced concrete core works with steel reinforcement to resist seismic loads. When properly engineered, reinforced, and connected to the foundation, ICF wall systems can help create the continuous load path needed during seismic events. That makes ICFs a strong fit for builders comparing earthquake-resistant construction techniques in high-risk regions.

Fox Blocks ICFs Make Building a Resilient Structure Easy

One of the key advantages of Fox Blocks is the strength of the reinforced concrete wall system. Properly reinforced concrete walls have a strong record in seismic design because they combine concrete strength with steel reinforcement. In addition to creating an energy efficient structure, Fox Blocks can help create durable walls for earthquake zones and other severe conditions.

Reach out to Fox Blocks today to learn more about how Fox Blocks can give you peace of mind, even in an earthquake zone.

FAQ: Earthquake-Resistant Construction

What Makes a Building Earthquake Resistant?

A building is earthquake resistant when its structure can transfer shaking forces through a continuous load path without brittle failure. Strength, stiffness, ductility, shear walls, diaphragms, and strong foundation connections all help the building manage lateral loads.

What Is the Best Construction Material for Earthquake Resistance?

There is no single best material for every site, but reinforced concrete is one of the strongest common options for seismic design. That is why many earthquake-resistant construction techniques rely on reinforced concrete systems.

What Is Base Isolation?

Base isolation separates part of the building from ground motion. Bearings or similar systems allow the ground to move while reducing how much shaking reaches the structure above.

Which U.S. States Have the Highest Earthquake Risk?

Risk varies by local hazard maps and code adoption. California has more damaging earthquakes than any other state, and Alaska and California have the most non-human-induced earthquakes. The Pacific Northwest is also a major seismic region because of the Cascadia Subduction Zone.

How Does ICF Construction Perform in Earthquakes?

ICF construction can perform well in seismic design when the wall system is properly engineered, reinforced, and connected. Fox Blocks ICFs combine reinforced concrete strength with an insulated form system, which can support durable wall assemblies for resilient structures.