When a 6.8-magnitude earthquake jolted southwestern Japan last week, its force mirrored the kind of seismic shocks capable of flattening cities and claiming hundreds or even thousands of lives. 7月底，一场6.8级地震袭击了日本西南部，其威力堪比那种能够夷平城市、夺走数百甚至数千人生命的强烈地震。 Yet across…