Recent work has shown that the last major earthquake in the Cascadia subduction zone occurred about 9 p.m. on 26 January 1700 and was about magnitude 9. This is known by ________.
A. analysis of annual growth rings in trees of downed forests along the Oregon-Washington-British Columbia coast showing large rings after 1699
B. Tsunami of 2-m (7-ft) height that hit Japan from midnight to dawn pointing to a 9 p.m. earthquake along the Washington-Oregon coast on 8 December 1699
C. Jesuit missionaries in the Chile and Alaska areas recording a very large quake and accompanying tsunami in their daily logs
D. analysis of annual growth rings in trees of downed forests along the Oregon-Washington-British Columbia coast showing no rings after 1699 and Tsunami of 2-m (7-ft) height that hit Japan from midnight to dawn pointing to a 9 p.m. earthquake along the Washington-Oregon coast on 26 January 1700.
E. Tsunami gauge measurements at the Pacific Tsunami Center
Answer: D
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What will be an ideal response?
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