Thousands of Southern Californians reported shaking from magnitude-4.5 earthquake that rattled a widespread part of the region early Tuesday, according to the U.S. Geological Survey.
The quake struck with a 4.5-magnitude at 4:49 a.m. at a depth of eight miles, eight miles north of Cabazon. It was originally reported as a 4.6-magnitude earthquake, but was downgraded by the USGS.
The agency received more than 7,000 reports of shaking on its web site.
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Scientists have warned that after more than 300 years with very little slippage, the southern end of the 800-mile-long San Andreas fault north and east of Los Angeles has built up immense pressure and could produce a massive earthquake at any time. Such a quake could produce a sudden lateral movement of 23 to 32 feet.
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A roadside attraction dinosaur towers over the desert near the San Andreas Fault in Cabazon.
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A natural spring-fed desert oasis is one of many supporting thousands of palm trees that line the San Andreas earthquake fault northeast of Palm Springs.
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Carbon dioxide gas escaping from underground fissures bubbles up from geothermal mudpots, or ''boiling mud pots'', near the southern end of the San Andreas Fault at the Sonny Bono Salton Sea National Wildlife Refuge on July 2, 2006 near Calipatria, California. The mudpots which only are to be boiling hot are located over the Salton Sea Geothermal Field where temperatures measured in wells drilled for geothermal brines reach 360 degrees Celsius at depths of 1,500 to 2,500 meters.
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Steam rises as a geothermal power plant taps into energy produced by underground pressures near the southern end of the San Andreas Fault.
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Residents attend a peewee baseball game south of the San Andreas Rift Zone. Experts have predicted that a quake of magnitude-7.6 or greater on the southern San Andreas would kill thousands of people and cause many billions of dollars in damages.
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A freight train passes diagonally-shifted layers of earth as it crosses the San Andreas Rift Zone. A magnitude-7.6 quake along the fault would dwarf the 1994 Northridge disaster near Los Angeles that killed 72 people, injured more than 9,000 and caused $25 billion in damage.
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Cars and trucks travel Interstate 10 near the San Andreas Fault, the main traffic and freight route from Los Angeles-area cities toward Arizona.
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San Bernardino City Hall, located 6.8 miles south of the San Andreas earthquake fault and 3.7 miles east of the San Jacinto Fault.
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Recently built homes are seen in suburban neighborhoods under construction on top of the San Andreas Rift Zone.
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Wind-power generators are seen near the San Andreas Fault near Palm Springs.
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Recently built homes are seen in suburban neighborhoods under construction on top of the San Andreas Rift Zone.
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A tractor passes diagonally-shifted layers of earth as it crosses the San Andreas Rift Zone, the system of depressions in the ground between the parallel faults of the San Andreas earthquake fault, while working on the heavily-used railroad tracks in Cajon Canyon.
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A large crack in the earth is seen in the San Andreas Rift Zone, the system of depressions in the ground between the parallel faults of the San Andreas earthquake fault, west of San Bernardino.
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The east branch of the California Aqueduct, which imports water from the Sierra Nevada Mountains, crosses the San Andreas Rift Zone.
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Palm Desert, in the Coachella Valley, where desert cities such as Palm Springs may be threatened by a major earthquake on the southern San Andreas Fault, is seen before dawn.
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A natural spring-fed desert oasis is one of many supporting thousands of palm trees that line the San Andreas earthquake fault.
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Calculations released in 2008 revealed a 99.7 percent chance that a magnitude 6.7 quake or larger will strike by 2037, according to the first-ever statewide temblor forecast released by the scientists of the United States Geological (USGS), Southern California Earthquake Center and California Geological Survey
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Palm Springs
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The San Andreas Rift Zone, the system of depressions in the ground between the parallel faults of the San Andreas earthquake fault, runs along the north side of San Bernardino.
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The San Andreas Fault is where the Pacific and the North American tectonic plates of the Earth's crust collide.
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The east branch of the California Aqueduct, which imports water from the Sierra Nevada Mountains, crosses the San Andreas Rift Zone.
KNBC
An opening in the earth is seen in the San Andreas Rift Zone.
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Saint Bernadine Hospital, one of many that could be overwhelmed by victims of a massive quake on the San Andreas earthquake fault, is seen in San Bernardino.
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San Bernardino City Hall
A second temblor with a 3.2-magnitude was recorded in the same area at 4:51 a.m.
Residents in San Diego, Seal Beach, Victorville, Redlands, Lancaster and other Southern California areas reported feeling the initial jolt.
No injuries or damage have been reported.
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The quake was centered just east of the 1986 North Palm Springs earthquake , located near a complex part of the infamous San Andreas Fault. The magnitude-5.9 quake damaged or destroyed 51 homes and triggered landslides. At least 29 people were injured.
Elizabeth Chavolla
This bag includes scissors, bandages, gauze, insurance cards, cut and rash creams, antiseptic cream, antihistamine tablets, cough syrup, alcohol towels, eye drops and distilled water.
Elizabeth Chavolla
Perhaps the most important tool in an emergency situation is the whistle, as this will help rescue teams find you.
American Red Cross
It is important that each member of your family has their own backpack. Each backpack should include everything that is mentioned on this list. Seniors, babies and pets must have their own backpack. If you have a pet, prepare a backpack with food and toys.
Elizabeth Chavolla
The poncho will keep you dry and protect you from rain. Also have a change of thermal clothing.
Elizabeth Chavolla
In a plastic bag, put soap, toothpaste, a toothbrush, deodorant, cotton, cleaning towels, lotion, disposable tissues, razors and feminine towels.
ElizabethChavolla
These lenses are used for protecting your eyes from dust and other hazards.
Elizabeth Chavolla
In a plastic bag include a copy of your identification, license, passport and social security.
Elizabeth Chavolla
One gallon of water per person is recommended, so that you have water for at least 3 to 5 days.
Elizabeth Chavolla
Be sure to pack one or two chargers for your phone, as well as portable chargers that can be pre-charged and ready to use while on the go.
Elizabeth Chavolla
All food you keep must be food that is not perishable. Do not forget to include a can opener.
Elizabeth Chavolla
It is important to have a flashlight in your emergency backpack, but also in every room of your home, given that a natural disaster can occur at any time. Make sure you have enough batteries.
Elizabeth Chavolla
It is important to have a self-charging radio and to have batteries for it. You can buy a radio combo, which includes flashlight, radio and phone charger.
Elizabeth Chavolla
These elements are necessary to close the gas supply in your home.
Elizabeth Chavolla
If you have a medical history, include a list of your medicines and have enough doses for one week.
Elizabeth Chavolla
Keep cash in your bag. In case of a major emergency, there will be no access to banks or ATMs.
NBC4's Jonathan Lloyd contributed to this report.