If you have not seismically retrofitted your house and an earthquake damages it, it could take years to repair, and you may have to take out a loan to make repairs. Reason 3: Make sure you have a place to live Think of it this way: it’s a lot cheaper to retrofit your house now than it is to repair it after an earthquake. Without a seismic retrofit, the repair costs you’d face after a damaging earthquake could be very costly. You have invested a lot of time and money into your older house. Reason 2: Financially protect your investment This means your house is safer, and you’ve reduced the chance of injury or even death in a devastating earthquake. Properly retrofitted houses are made stronger against earthquake shaking and damage. Many houses that require only bolting cost about $3,000. Larger homes, those built on hillsides, and those with basements or rooms over garages will typically cost more to retrofit. While there isn’t a standard cost for earthquake retrofitting a home, the range is usually about $3,000 to $7,000. A foundation bolting process usually costs a few thousand dollars and can be done within several days without the residents moving out. Retrofitting single-family homes is considered one of the cheapest seismic improvements available. This makes a building safer and less likely to suffer damage during an earthquake. What are the Benefits of Retrofitting?Įarthquake retrofitting ( seismically retrofitting) a house is done to prevent displacement from the structure’s concrete foundation. The new statewide probabilities are the result of a model that comprehensively combines information from seismology, earthquake geology, and geodesy (measuring precise locations on the earth’s surface). The new study determined the probabilities that different parts of California-including higher-risk areas like the Bay Area and the city of Los Angeles-will experience earthquake ruptures of various magnitudes. The 2019 Ridgecrest earthquake happened on a brand new fault line along the Eastern California Shear Zone. The southern San Andreas fault is much closer to Los Angeles, running at its closest just 25 miles northeast of downtown through the San Gabriel Mountains, and is capable of unleashing a magnitude 8.2 quake throughout all of Southern California. For Southern California, within the next 30 years the probability is 60% for an earthquake measuring magnitude 6.7.The Loma Prieta quake caused 63 deaths, 3,757 injuries, and about $6 billion in damage. Such quakes can be deadly, as shown by the 1989 magnitude 6.9 Loma Prieta earthquake. For Northern California, the most likely source of such earthquakes is the Hayward-Rodgers Creek Fault (31% in the next 30 years).What Are the Chances of a Major California Earthquake?Ĭalifornia has more than a 99% chance of having one or more magnitude 6.7 or larger earthquakes within the next 30 years, according to scientists. One stood undamaged, its neighbor had shifted off its foundation with dramatic structural damage.Ĭonsider this case study on the cost effectiveness of retrofitting. Houses shook violently, but two houses that sit side-by-side in Napa had different outcomes. This 6.0 M severe event was the largest quake in the San Francisco Bay Area since the 1989 Loma Prieta earthquake. The 2014 South Napa earthquake occurred on August 24 at 03:20:44 Pacific Daylight Time. The purpose of seismic retrofits for earthquakes is to keep your home from being displaced from its foundation-making the building safer and less prone to major structural damage during an earthquake. Homes built before 1980 are especially at risk because many were not built to resist shaking and moving. The motion on the earth's crust can cause severe damage to older homes. Earthquakes occur suddenly and without warning.
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