Discussion
An earthquake has a focal depth of 15 km and its epicentre is 20 km from a site. The hypocentral distance to the site is
Answer: C
The focus, the epicentre and the site form a right-angled triangle with the depth vertical, so the hypocentral distance is the square root of 15 squared plus 20 squared, which is 25 km. Adding or subtracting the two figures is the common error.
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