When a big earthquake strikes, it does not do equal harm everywhere. Places resting on ＿＿（1）＿＿ sediment will shift around a lot and are thus likely to be damaged badly. ＿＿（2）＿＿ resting on bedrock are normally better off – though not if they are stuck at the end of a rocky promontory that ＿＿（3）＿＿ a quake's vibrations in the manner of a tuning fork. Finding the areas most badly damaged, and ＿＿（4）＿＿ most urgently in need of assistance, in an area whose ＿＿（5）＿＿ is not already well understood is thus a high-stakes game of hide-and-seek.