Why Do So Many Earthquakes Happen in the Ring of Fire?

The Pacific Ring of Fire is once again in the spotlight following the powerful magnitude 7.4 earthquake that struck western Colombia on August 10. This vast zone of seismic and volcanic activity surrounds much of the Pacific Ocean and includes some of the most active tectonic plate boundaries on Earth.

The earthquake was centered near San José del Palmar in Colombia’s Chocó Department, causing serious damage in several cities across western Colombia and shaking areas hundreds of miles from the epicenter.

The Colombian earthquake came approximately six weeks after another major seismic event in South America. On June 24, Venezuela was struck by two powerful earthquakes less than a minute apart. According to records cited by Reuters, the first measured magnitude 7.2 and the second magnitude 7.5. Subsequent research described the sequence as a double seismic event along the boundary between the Caribbean and South American plates.

The Monday earthquake in Colombia was the 10th worldwide this year to register at least magnitude 7.0 on the Richter scale.

It was also the strongest to strike Colombia since a magnitude 8.0 earthquake was recorded on July 31, 1970. https://t.co/VHogp28qeK pic.twitter.com/ToxZ0K9Gof

— AccuWeather (@accuweather) August 10, 2026

The short time between these major earthquakes raises an inevitable question: Are they connected?

Scientists urge caution. Two major earthquakes can occur within weeks of each other without one causing the other. Seismic activity in South America is driven by several different tectonic systems and faults, and there is no evidence that an earthquake in Venezuela can be used to predict another in Colombia—much less a future earthquake in the United States.

Still, these events highlight a much broader geological reality: much of the Americas is connected to the tectonic system surrounding the Pacific Ocean.

What Is the Pacific Ring of Fire?

The Ring of Fire—also known as the Pacific Ring of Fire—is a vast belt of seismic and volcanic activity surrounding much of the Pacific Ocean.

It is not a single fault. Instead, it consists of a series of tectonic plate boundaries, subduction zones, faults, and volcanic arcs.

According to the U.S. Geological Survey (USGS), approximately 81% of the world’s largest earthquakes occur within the circum-Pacific seismic belt. Some of the most powerful earthquakes ever recorded within this system include the magnitude 9.5 Chile earthquake of 1960 and the magnitude 9.2 Alaska earthquake of 1964.

The explanation lies beneath our feet.

Tectonic plates are constantly moving, although usually at rates of only a few inches per year. At certain boundaries, one plate can move beneath another through a process known as subduction. In other areas, plates slide horizontally past each other.

That movement does not always happen smoothly. Friction can lock sections of a fault while the plates continue moving and stress continues building.

When that stress exceeds the strength of the rocks, the fault ruptures and the stored energy is released as seismic waves.

That is an earthquake.

Colombia Sits in an Especially Complex Tectonic Region

UPDATE ON COLOMBIAS 7.4 EARTHQUAKE

More than 130 dead.
Around 2,700 still missing.
1,600 buildings damaged or completely collapsed.

Rescue crews are digging through the rubble right now searching for anyone still alive.

The Trump administration just pledged $15.5 million to… pic.twitter.com/TWdKyILypW

— Gunther Eagleman™ (@GuntherEagleman) August 11, 2026

Colombia is particularly interesting from a geological perspective because several tectonic systems interact in the region.

The Nazca Plate moves eastward from the Pacific and is forced beneath South America, while the Caribbean Plate also influences the northern part of the country. Colombia also has a complex network of continental faults.

As a result, Colombia experiences both shallow and deep earthquakes and has several regions with significant seismic hazards.

But this does not mean that every earthquake in Colombia is part of a chain that will inevitably continue northward.

The Earth does not work like a row of dominoes around the Pacific.

A major earthquake can alter stress on nearby faults and produce aftershocks or, under certain circumstances, contribute to ruptures on neighboring fault segments. But an earthquake thousands of miles away does not mean that California, Oregon, Washington, or Alaska will be next.

Why Did Major Earthquakes Occur Only Six Weeks Apart?

The most important explanation is geography.

South America is crossed by several extremely active tectonic plate boundaries.

The earthquakes that struck Venezuela on June 24 were associated with the boundary between the Caribbean and South American plates. During that event, two major earthquakes occurred just 39 seconds apart.

The August 10 earthquake in Colombia occurred much farther west, within another tectonically complex region.

Therefore, the fact that the two events occurred approximately six weeks apart does not prove that the first earthquake caused the second.

What they do demonstrate is that northern and western South America contain multiple geological systems capable of generating major earthquakes.

Could a Major Earthquake Strike the United States?

Yes. The United States has several of the continent’s most important seismic zones, some of which are directly connected to the circum-Pacific seismic belt.

From a ground transportation perspective, four states are particularly important: California, Oregon, Washington, and Alaska.

California: The San Andreas and Hundreds of Active Faults

California is probably the best-known example.

The San Andreas Fault marks much of the boundary between the Pacific and North American plates. The two plates move horizontally past each other.

According to the USGS, the Pacific Plate moves northwest relative to the North American Plate at approximately two inches per year.

But the San Andreas is far from the only fault in California.

Southern California has more than 300 faults capable of producing earthquakes of magnitude 6 or greater, according to the USGS. The agency considers Southern California to have the highest seismic risk in the United States because of the combination of geological hazards, population density, and exposed infrastructure.

For the trucking industry, this makes corridors including I-5, I-10, I-15, I-40, I-80, and US-101 critical infrastructure during a major emergency.

The danger is not limited to cracked pavement.

An earthquake can damage bridges, overpasses, interchanges, tunnels, and access roads. It can also trigger landslides, rockfalls, soil liquefaction, and disruptions to essential services.

Oregon and Washington: The Cascadia Threat

Farther north, the threat is different.

The Cascadia Subduction Zone extends from Northern California to southern British Columbia, offshore from Oregon and Washington. It is a subduction zone capable of producing extremely powerful earthquakes.

And the danger is not limited to ground shaking.

A major Cascadia earthquake could also trigger tsunamis, landslides, and widespread infrastructure damage across a large portion of the Pacific Northwest.

For the transportation industry, one of the greatest challenges would be keeping critical corridors operational so fuel, food, medicine, rescue equipment, and other essential supplies could continue moving after the disaster.

Are U.S. Highways Prepared?

The short answer is: There has been considerable preparation, but that does not mean every highway would remain open after a major earthquake.

Transportation departments in the states facing the greatest seismic risks have spent years developing programs to strengthen bridges and critical transportation corridors.

The Washington State Department of Transportation (WSDOT), for example, operates a seismic retrofit program designed to reduce the risk of bridge collapse. More than 900 bridges are included in the program, with priorities determined by seismic risk, structural characteristics, and the importance of each route.

Washington has also identified a network of Seismic Lifeline Routes—highways considered essential for maintaining mobility after an earthquake.

Along corridors such as I-405, bridge columns have been reinforced with steel structures to reduce the possibility of collapse during a major seismic event.

Oregon Is Preparing Routes to Keep Supplies Moving

Oregon faces one of the most complex scenarios because of the Cascadia Subduction Zone.

The state has therefore been working on corridors that could serve as emergency transportation routes after a major earthquake.

One example is US-97, where several seismically vulnerable bridges have been replaced or strengthened. The Oregon Department of Transportation’s goal is for US-97 to function as one of the primary north-south transportation routes following a major earthquake.

Work has also been carried out along OR-58, a strategic corridor connecting I-5 and US-97 that could help move supplies between the Willamette Valley and Central Oregon after a disaster.

However, vulnerabilities remain.

The Boone Bridge on I-5, for example, is a critical link in the West Coast freight corridor. Oregon DOT acknowledges that the bridge faces significant risk from a Cascadia Subduction Zone earthquake and has been studying its replacement. Approximately 17,000 trucks cross the bridge every day.

This illustrates why describing highways as “earthquake-ready” requires some perspective. Significant investments and emergency plans are in place, but a major earthquake could still overwhelm vulnerable sections of transportation infrastructure.

Alaska: America’s Most Seismically Active State

Alaska belongs in a category of its own.

According to the USGS, Alaska experiences more large earthquakes than the rest of the United States combined, and more than three-quarters of its population lives in areas capable of experiencing a magnitude 7 earthquake.

The magnitude 7.1 earthquake near Anchorage in November 2018 demonstrated both the vulnerability and resilience of Alaska’s highway network.

Following the earthquake, the Alaska Department of Transportation evaluated more than 265 sites and determined that more than 150 required permanent repairs.

At the same time, crews were able to restore critical routes through emergency repairs in just five days.

Does an Earthquake in Colombia Mean California Could Be Next?

No.

It is important to avoid a common misconception that often appears after major earthquakes: the idea that an earthquake in South America means the next one will necessarily occur farther north along the Ring of Fire.

There is no predetermined geographical sequence.

California, Cascadia, and Alaska already face significant seismic risk regardless of what happened in Colombia or Venezuela.

Scientists currently cannot predict earthquakes by specifying the exact day, time, and location of the next major event.

What science can determine is where active faults exist, which regions have a greater probability of experiencing strong shaking, and which infrastructure is most exposed.

What Should Truck Drivers Do During an Earthquake?

For people who spend their working lives on the road, earthquakes present particular challenges.

A heavy truck requires considerably more distance to stop than a passenger vehicle, and drivers may encounter road damage that is not immediately visible after the shaking stops.

If a driver feels strong shaking while on the road, the first priority should be to gradually reduce speed and find a safe place to pull over, avoiding sudden braking whenever possible.

Drivers should stay away from bridges, overpasses, tunnels, utility poles, overhead signs, buildings, trees, and hillsides where rockfalls or landslides could occur.

Once safely stopped, remaining inside the cab can provide protection from falling objects unless an immediate danger makes it necessary to leave the vehicle.

Drivers should also assume that aftershocks may follow the initial earthquake.

It is particularly important not to automatically drive onto a bridge or overpass after a strong earthquake, especially if there are visible cracks, displacement, fallen structures, or road closure signs. Authorities may temporarily close highways while engineers inspect bridges and other infrastructure.

In coastal areas of California, Oregon, Washington, and Alaska, there is another major hazard: tsunamis.

After a strong or prolonged earthquake near the coast, drivers should immediately follow official evacuation instructions and move toward higher ground when directed to do so.

Long-haul truckers should also consider carrying water, nonperishable food, a flashlight, chargers or a portable power bank, a first-aid kit, warm clothing, and enough fuel to handle unexpected detours or extended delays.

Before continuing a trip after an earthquake, drivers should check official alerts from the appropriate state Department of Transportation (DOT).

A highway that appears open may be closed several miles ahead because of bridge damage, landslides, debris, or emergency inspections.

The Risk Is on the Map, but Preparation Matters Too

The major earthquakes in Venezuela and Colombia, separated by approximately six weeks, do not mean that a chain of earthquakes is moving toward the United States.

But they do serve as a reminder of a permanent geological reality.

From South America to Alaska, the Americas cross some of the most active tectonic boundaries on Earth. In the United States, California, Oregon, Washington, and Alaska face particularly significant risks for highways and freight transportation.

Authorities have strengthened hundreds of bridges, identified emergency routes, and developed strategic transportation corridors designed to keep essential supplies moving after a disaster.

Even so, no highway system can be considered completely immune to the effects of a major earthquake.

For those who make their living on the road, prevention is also part of the journey: knowing the risks along your route, checking official alerts, carrying basic emergency supplies, and having the right insurance coverage can make a major difference when an emergency changes road conditions in a matter of seconds.

In earthquake-prone areas, traveling prepared also means traveling insured.