10. where do surface waves originate? the focus the epicenter 11. which have the highest amplitudes? primary…

Brief Explanations:

10. Surface - waves originate at the epicenter. The focus is the point within the Earth where an earthquake rupture starts, and surface - waves are generated and spread out from the epicenter which is the point on the Earth's surface directly above the focus.
11. Surface waves have the highest amplitudes. Primary waves (P - waves) are compressional waves that travel fastest and have relatively small amplitudes. Secondary waves (S - waves) are shear waves that are slower than P - waves and also have smaller amplitudes compared to surface waves. Surface waves move along the Earth's surface and cause the most damage due to their large amplitudes.

Answer:

10. the epicenter
11. surface waves