Statement-1 : Earthquakes cause vast devastation. Sometimes short and tall structures remain unaffected while the medium height structures fall
Statement-2 : The natural frequency of the medium structures coincides with the frequency of the seismic wave.

Explanation

This is because the natural frequencies of short structures are higher and those of tall structures are smaller than the frequency of seismic waves. So, resonance is avoided in these structures. On the other hand, frequencies of medium-these structures. The amplitude of oscillations of medium-height structures becomes large and they are, therefore, more prone to collapsing.