![]() ![]() But if its a big earthquake on the coast or in California, it would take a few. Dozens of earthquakes have been documented in the last few hundred years, and many of them have been deadly. If we're going to be prepared for the "big one," it's important to understand what happened during the worst California earthquakes on record and which places are most vulnerable. This list catalogs the worst California quakes and might shed some light on how to prepare for earthquakes of the future. If a magnitude 9 earthquake happens on the coast, Pacific coastal. You don't have to look far in California's earthquake history to see just how bad a quake can get. The highest magnitude earthquakes in California's history have caused death and mass destruction, often costing the state millions in repairs. Fri 11.47 EDT Last modified on Fri 14.23 EDT Earthquakes have rattled a large area of northern California this week, including a strong aftershock shake early on Friday. The majority of Californians live within 30 miles of an active fault line, and the likelihood of a powerful earthquake in the coming decades is extremely high. Luckily for Californians, only about 500 of those faults are active today, but hardly any area of the state is completely immune to earthquakes. Without the giant lake there, putting enormous pressure on the San Andreas and contributing to a more vulnerable fault, the coming big one a Southern California quake that could cause some. Overall, the US Geological Survey says there are 31 and 20 per cent probabilities of an earthquake measuring magnitude 7. California has always been a hotbed of seismic activity, largely thanks to the over 15,000 fault lines found throughout the state. The southern San Andreas fault in California is in a seismic drought, going more than 300 years without a major earthquake. Los Angeles experiences an average of five earthquakes a year with magnitudes between 3 and 4, putting recent quakes within the normal range of size and frequency.
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