The second earthquake caused 2 * 4 = <<2*4=8>>8 buildings to collapse.
The third earthquake caused 2 * 8 = <<2*8=16>>16 buildings to collapse.
The fourth earthquake caused 16 * 2 = <<16*2=32>>32 buildings to collapse.
Including the first earthquake, the earthquakes caused 4 + 8 + 16 + 32 = <<4+8+16+32=60>>60 buildings to collapse.
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