>> and this is the vertical version. >> there's a vertical surface wave and horizontal surface wave. the vertical has an up or down motion and the horizontal has a back and forth motion. >> some type of hybrid, as well, where it can go both ways. >> it can go both ways. both of them will arrive. they will be two separate waves. first the vertical wave, then the horizontal. >> which does more damage? >> it really depends on the structure, i think, so they're both damaging. >> we are getting a lot of reports of violent shaking, yet the reports of fatalities is significantly lower than haiti. >> well, yeah. >> tell me about that. >> i think that probably has to do with having building codes, better building codes and more importantly, enforcing those building codes. and the other thing is that, you know, people in chile, they experience earthquakes on a more regular basis so they're more prepared for that. i think those combinations of