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FILE - In this Oct. 18, 1989, file photo, rescue dogs are brought into position to begin searches of destroyed houses in the Marine District of San Francisco, Calif., after a strong earthquake caused widespread damage. The Los Angeles Times analysis finds the San Francisco Bay Area is falling behind on efforts to retrofit buildings that are vulnerable to collapse during a major earthquake. The newspaper reported Sunday, April 22, 2018, that there are up to 3,000 brittle concrete buildings in San Francisco, yet the city doesn't have a list of where they are located. The building type is one of the deadliest in quakes. (AP Photo/Eric Risberg, File)

8.7-magnitude earthquake off Sumatra

An 8.7-magnitude earthquake strikes Indonesia 434 km southwest of Banda Aceh, Sumatra, Indonesia.