Very low risk.
California on the west coast
An undersea earthquake, anywhere in the vastness of the Pacific Ocean, is likely to effect any country whose coast borders the ocean - not just California alone.
No, human swimmers are not usually in great danger from sharks. Shark attacks on humans are rare, and most shark species are not interested in preying on people. It's important to practice caution in areas known for shark activity, but the risk of a shark attack is very low.
On average, there are around 5-10 shark attack fatalities worldwide each year. It is important to note that the risk of a fatal shark attack is very low compared to other risks, such as drowning or car accidents.
Geologists determined that the west coast of California has a higher earthquake risk due to the presence of the San Andreas Fault, which is a major tectonic plate boundary. The high level of tectonic activity along this fault increases the likelihood of large earthquakes in this region compared to other areas in the US. Additionally, historical records of past seismic events and studies of seismic activity have helped geologists assess and quantify the earthquake risk for California.
You will see more Jelly fish & Rays than Shark. However, Most reported shark sightings (showing highly increased since '96) have been around the Catalone Coast. From what I have heard and read.
The four shark species that are known to pose a higher risk to humans due to their potential for attacking and consuming prey, including humans, are the great white shark, tiger shark, bull shark, and oceanic whitetip shark. However, it's important to note that these incidents are rare, and most sharks do not target humans as prey.
Risk
AlaskaAleutian Islandswest coast (i.e. Washington, Oregon, California)Rocky Mountainsparts of Missourietc.
The Tiger Shark when full grown has no known enemies. However, Babies are at risk of being eaten by other breeds of shark.
It will cut your risk of a heart attack into half.
Maybe.