ONTARIO, Calif. -- A Southern California earthquake caused a house explosion that sent a man in his 70s to the hospital with minor injuries.

The Inland Valley Daily Bulletin (http://bit.ly/Tk7vgV ) reports the 4.5-magnitude quake that hit Orange County Wednesday morning was followed two hours later by an explosion at a house in Ontario in neighboring San Bernardino County.

Authorities say the quake caused material stored in the garage to fall over, opening a natural gas valve. A water heater ignited the gas and the resulting explosion shattered windows in the home and a neighboring residence, started a small fire and hurled the garage door into a neighbor's yard.

Damage was put at $200,000.

The quake was one in a series that began with another 4.5-magnitude temblor late Tuesday.

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Information from: Inland Valley Daily Bulletin, http://www.dailybulletin.com