The Pacific Tsunami Warning Center (PTWC) declares a "tsunami watch" when an earthquake meeting three criteria is identified.Which of the following characteristics is not one not needed for a watch to be issued?
A) Richter magnitude of 7.0 or greater
B) Reports of shaking for more than one-minute
C) Epicenter on ocean floor
D) Hypocentre shallower than 100 kilometres
Correct Answer:
Verified
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