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Concurrent shake-table testing of two 12-story building models: the right one is resting on base isolators called earthquake protectors. Image by Shustov from

10 Deadliest Natural Disasters in California

Warm sunshine, beautiful beaches, stunning mountains, vibrant cities and a seemingly endless array of natural wonders is California for you.  The prevalence of disasters is its dark underbelly. From earthquakes to floods and mudslides, these disasters have caused immense destruction and loss of life throughout the state.  The nature of natural disasters is that they can strike at any time without warning no matter the beauty of a place. From devastating earthquakes to raging wildfires, the Golden State has seen its share of destruction over the years. This article looks at 10 of the deadliest natural disasters that have occurred in California’s past. Preparedness and understanding the past is the only way to minimize their impact on lives and property.

Deadliest Earthquakes in California

San Francisco Earthquake – 1906

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The San Francisco earthquake of 1906, was a major geological event. The strength was 7.8 on the Richter scale. A rupture along the San Andreas Fault, which runs through California was the cause. The destruction was widespread. The shaking caused many buildings to collapse or catch fire, and the resulting fires raged for three days. 28,000 buildings were razed leaving over 250,000 people homeless. Over 3,000 people died and damages amounted to billions of dollars in damages and 80% of the city was destroyed. San Francisco and the rest of the country were profoundly affected.  The new buildings were designed to withstand future earthquakes during the rebuilding. The United States Geological Survey was established following the earthquake to study and monitor earthquakes.

Long Beach Earthquake – 1933

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The Long Beach earthquake of 1933 had a magnitude of 6.4 on the Richter scale. Many buildings collapsed including schools, hospitals and government buildings. In total, 5000 people lost their lives. The earthquake also triggered a fire that destroyed several blocks of downtown Long Beach. Broken gas lines fueled fires, which burned for over five hours.  It was the first earthquake to be extensively documented through photographs, newsreels and other forms of media. The disaster prompted significant public interest in earthquake science and engineering, which in turn helped to drive advancements in the field. An outcome of the earthquake was the passage of the Field Act. It mandated all new schools in California be designed and constructed to be earthquake-resistant.

San Fernando Earthquake – 1971

The San Fernando Valley region of Los Angeles was hit by The San Fernando earthquake on February 9, 1971. For about 12 seconds the area felt the wrath of a magnitude of 6.6 on the Richter scale quake. Movement along the San Fernando Fault is responsible for the earthquake. San Diego and Las Vegas also rumble to the mighty shake. There was extensive damage to buildings, roads, and infrastructure throughout the San Fernando Valley. Its visitation during rush hour exacerbated the scale of impact. Most notable was the tragic collapse of the Interstate 5 overpass over the Antelope Valley Freeway.   The earthquake left a total bill of $500 million. In response to the earthquake, the state of California passed new building codes that required seismic-resistant design and construction techniques.

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Loma Prieta Earthquake – 1989

Journalists filing reports after the Loma Prieta Quake. Image by Nancy Wong from

San Francisco Bay Area in California was struck by a significant earthquake known as the Loma Prieta quake on October 17, 1989. The Mountains of  Santa Cruz were the epicentre. The earthquake resulted in extensive damage and fatalities, particularly in the San Francisco and Oakland regions. A portion of the San Francisco-Oakland Bay Bridge collapsed. The death toll was 42 people while more than 3,700 were injured. $6 billion was the price tag for this earthquake. The San Francisco Bay Area hadn’t witnessed a large quake like this since 1906.  Fires razed homes and approximately 3,000 people and left over 250,000 homeless. In the history of the area, this quake was a significant event. The impact was not only felt by the lives of its residents but also on the city’s infrastructure.

Northridge Earthquake – 1994

The San Fernando Valley region of Los Angeles, California experienced a powerful earthquake that occurred on January 17, 1994. For approximately 20 seconds buildings, infrastructure and homes throughout the region were shaken by a magnitude of 6.7 quake. The earthquake caused 57 fatalities, over 8,700 injuries. Estimated $20 billion in property damage was recorded.  The transportation system and freeways were closed for repairs due to damage. The Northridge earthquake was the most destructive earthquake in the United States. Following this earthquake, significant improvements were imposed on engineering practices. Authorities increased public awareness of earthquake safety and preparedness.

10 of the deadliest Natural Disasters that Happened in the United States.

Deadliest Wildfires in the History of California

Oakland Hills Firestorm – 1991

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The Oakland Hills Firestorm was a catastrophic wildfire that occurred in the hills of Oakland, California, in October 1991. High winds, low humidity and dry conditions caused the firestorm that burned for three days.  It destroyed over 3,000 homes and killed 25 people. The fire started on October 19, 1991, when a small brush fire ignited in the hills above Oakland.

With the 65 miles per hour winds, the fire quickly spread. The severe drought was to blame for the. Within hours, the fire spread out of control and burned through the densely populated neighbourhoods of the Oakland hills. 1,500 firefighters tried to contain the fire on over 1,500 acres of land.  The loss ran into millions of dollars. The city of Oakland had ignored warnings of the potential for a catastrophic wildfire for years. Following the fire, Oakland improved fire prevention and education programs.

Cedar Fire – 2003

The 2003 Cedar Fire was a devastating wildfire that burned across San Diego County in Southern California, United States, in October 2003. The fire burned for ten days before it was finally contained. The Cedar Fire is one of the largest wildfires in California’s history.  The total acreage burnt was 273,246 acres (1,105.4 km²).  15 people perished and 113 people were injured. The cause of the Cedar Fire was found to be a lost hunter who set a signal fire that eventually grew out of control.  The fire also caused significant damage to wildlife habitats and watersheds in the affected areas. The Cedar Fire exposed the dangers of wildfires and the importance of fire prevention measures. Firefighting techniques and technology were upgraded to better predict and respond to wildfires.

Related Read: 10 Worst Natural Disasters in the History of Arizona.

Tubbs Fire – 2017

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The 2017 Tubbs Fire was a devastating wildfire that occurred in Northern California, primarily in Sonoma and Napa counties. The fire burned a total of 36,807 acres.  The fire consumed 5,600 structures, including homes, businesses and other buildings. In 2017 there were many fires and the Tubbs Fire was one of several wildfires that broke out in October of that year. Strong winds, low humidity, and dry vegetation created the perfect condition for the fire. According to fire investigations, the flame was ignited by a downed power line in the Calistoga area.  Firefighters from across California and neighbouring helped in battling the blaze. With a loss projected at $1.2 billion, the Tubbs Fire was one of the most destructive wildfires in California.

Camp Fire – 2018

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The 2018 Camp Fire was a wildfire that burned in Butte County in Northern California, United States. Sparks from electricity transmission lines owned by Pacific Gas and Electric (PG&E), ignite the fire.   17 days of raging fires, destroyed more than 18,000 structures and killed 85 people.  PG&E filed for bankruptcy protection, citing billions of dollars in potential liabilities related to the blaze and other wildfires. The company has since reached a settlement with wildfire victims and emerged from bankruptcy under new ownership and leadership. The Camp Fire also spurred new efforts to improve wildfire prevention and response in California, including changes to utility regulations and increased funding for forest management and firefighting resources.

California’s Deadliest Storm

California Tropical Storm – 1939

One of the deadliest hurricanes to impact California occurred in 1939. The storm, known as the 1939 California Tropical Storm, formed off the coast of Mexico in late September and moved northward toward California. The storm brought heavy rains and strong winds to the state. There was widespread flooding and landslides in several areas. Instances of tropical storms and hurricanes though rare have affected the state, with some resulting in significant damage and loss of life.

The most affected area was the Los Angeles region. The Los Angeles River overflowed, resulting in severe flooding in the city’s low-lying areas. The flooding caused extensive damage to homes and infrastructure, with many roads and bridges being washed out. The storm’s estimated fatalities were 45 and hundreds of injuries. The 1939 California Tropical Storm is considered one of the deadliest natural disasters in California’s history

Interesting Read: California Storm Chasing Mendicino Style.

California has a long and tragic history of natural disasters, from earthquakes to wildfires. These ten deadly events are just a few examples of the devastation that can occur in this beautiful state. Steps to prepare for and mitigate the effects of natural disasters have been put in place  in California. By staying informed, having an emergency plan, and working together the impact of these disasters can be minimised.