announcements exams are looking pretty good -- ridiculously close to a classic bell- shaped curve --...
Post on 21-Dec-2015
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Announcements
• Exams are looking pretty good -- ridiculously close to a classic bell-shaped curve -- some A’s, more B’s, lots of C’s, fewer D’s, no F’s yet (I don’t think)…
• Today/Weds/after break we’ll do tsunami; I wouldn’t come to class on Friday if I were you…
TSUNAMI
• READ– p. 226 - 229 (up to “Variation along a Coastline”,
including Case Study 8.1)– p. 235 - 240 (including Case Study 8.2 and the
survivor story)– p. 242 (paragraph that begins with “Tsunamis…”)– p. 247-248 (section on tsunami)– p. 262 (“Adjustments to Tsunamis”)
TSUNAMI
• The volcano chapter was back-up for me talking about my field of expertise -- now we’re into things I know less about -- so count on quizzes/clicker Q’s to show you’ve read
Cerro Negro, an odd cinder(?) cone in Nicaragua, last erupted last in 1999. In 2004, there was active seismicity at Cerro Negro. Using what you know
about cinder cones, would you say this one is
• dormant
• extinct
• activeCerro Negro, Nicaragua
My favorite dome erupted 110,000 years ago and 70,000 years ago. Using what you know about domes, would you say
my dome is
• dormant
• extinct
• active
(Mt. Elden -- not my favorite, but very cool, nonetheless)
The San Francisco Volcanic Field has been erupting for 8 million years, on and
off. The most recent eruption was Sunset Crater, ~ 900 years ago. The SFVF is
best characterized as…
1. dormant
2. extinct
3. active
context
• We learned from the 2004 Banda Aceh earthquake and tsunami that many parts of the world aren’t well prepared for tsunami. Things are radically better already in the SW Pacific
• We’ll look at a “first-world” country and see how they’re preparing, but first you need to know about tsunami in general
To understand tsunami you have to understand waves…
• Sea or lake (“normal”) waves– velocity of wind– duration of wind– fetch
• (Read about wave sets and rogue waves in the text)
Wave terms1. Crest/trough2. L = wavelength3. H = wave height4. T = wave period5. V = wavelength/
wave period6. wave base = ~
1/2 L