What is seismic retrofitting itself and which are seismic retrofit maps? - It is the modification of existing structures to make them more resistant to seismic activities. With an understanding of seismic demand on structures and with our recent experiences with large earthquakes near urban centers the need for seismic retrofitting is well common and its maps are getting more and more expanded. During the late 60s for developed countries such as Japan and The United States, and during the late 70s for many other parts of the world, many structures were designed without proper detailing and reinforcement for seismic protection. Since that various researches have been carried out.
On October morning, Compton was rocked by a 3.7 magnitude earthquake. This magnitude could not cause any remarkable damage of course, but this earthquake served as a reminder that we should get ready in the San Fernando Valley. If you still have not started your retrofit, now it is time to research the retrofit companies In Los Angeles.
LA 5 Major Fault Lines
Exactly hundreds of fault lines run below Los Angeles city. And for all of the ones that have been mapped, it is believed that there are actually more, which are not found yet. The fault line that is responsible for the Northridge Earthquake which occurred in 1994, was among the ones that were unknown. During recent years, so many new faults have been found that the state of CA is now mandating new fault maps be created.
The new maps are going to be a direct impact on new construction in the city and all earthquake retrofit contractors in LA need to get their hands on these new maps. Some of these new fault lines could have a direct impact on the retrofit projects that are ongoing as part of Los Angeles’s mandatory seismic ordinances. Now, five major fault lines have been discovered that are probably to erupt until 2050 and those are:
- San Andreas Fault
- Puente Hills Thrust Fault
- Newport-Inglewood Fault
- Santa Monica Fault
- Hollywood Fault
The most famous fault line in all of Southern CA is the San Andreas. The folks for years have been predicting a large earthquake from this fails that will cause CA to fall into the ocean. There are even many movies and TV shows about future disasters. Experts all agree that San Andreas most likely can not generate an earthquake large enough to separate the state from the continent.
The last major earthquake that is generated by San Andreas was over 160 years ago and recent research shows the fault line due to a big rupture on the southern end.
The average interval between quakes on the San Andreas range from 44 - 305 years. A simulation was done 5 years ago and estimated that an earthquake this fault of 7.8 could result in $200 billion on damage, as well as 2000 deaths and 50.000 injuries.
Puente Hills Thrust
The Puente Hills Thrust was located in 1999 and many experts believe is it going to be the most dangerous fault in the city of Los Angeles. This fault runs through the hears of the city beneath Hollywood and Downtown. Unlike many of the other faults knows as slip-strikes, which move horizontally, the Puente Hills Thrust moves at a diagonal angle. A major quake on this fault would disrupt if it fully halts all city government agencies. The Emergency Operation Centerline and City Hall both are on this fault.
The Newport-Inglewood fault is also among the most dangerous ones - even more than the San Andreas. It runs directly beneath many cities in Southern CA and it has been mapped from the Westside Of the city of LA al the way to Long Beach on the Orange country coast. Geologists also believe it may be connected to the Rose Canyon fault which runs down to San Diego.
In a 2017 simulation, they determined that the Newport-Inglewood fault may rupture in connection with the Rose Canyon fault. So the two faults together could generate an earthquake of 7.5 magnitudes and will impact a trail of gas and oil facilities across the country.
If this were to happen, fuel supplies would be badly hit. Owners of electric vehicles would be spared but commercial truck drivers, residents and major airlines may be limited bu this lack of gas. Due to this, LA has the largest fleet of electric-powered vehicles in the country. Lack of fule could also impact the work being done by the many retrofit companies in LA.
Santa Monica Fault
During the past year, many of the new maps made of fault lines show that the Santa Monica Fault is longer than previously believed. This longer fault brings with it the potential to generate a larger earthquake than geologists originally thought.
The fault is now shown to extend from Santa Monica past the UCLA medical center and ending very close to the Cedars Sinai complex. A large earthquake on this fault could seriously impact patients in the medical centers, along with making it difficult for anyone injured in the earthquake to be able to get care.
The Hollywood Fault is one of the new faults that were mapped this year. It runs underneath some highly residential neighborhoods into the Hollywood Hills. A major earthquake on this fault line could result in millions of dollars in property damage and thousands of injuries.
Many of the neighborhoods on this fault line are high landslide risks. If the ground gives way during an earthquake, residents could by trapped due to collapsed driveways and canyon roads that are cut off and impassable for vehicles of any kind. Experts recommend that residents in these types of neighborhoods have a plan in place for how to evacuate or navigate around obstacles when a disaster strikes.