Modern Geology
Plate Tectonics & Geochronology

Messiquakes

• seismograph
• FCB:Bayern (6/5/2015)
• compilation

Covid lockdown

• Brussels
• Paris, Place de la Concorde

Japan, Noto peninsula, January 1, 2024 (Mw 7.5)
Anchorage, Alaska, November 30, 2018 (Mw 7.0)
1964 Great Alaska Earthquake & Tsunami (Mw 9.2)

Plate tectonics

ocean floor mapping

• Harry Hess (1906-69) (Princeton Univ.)
  • fathometer
  • "guyots"
  • "History of Ocean Basins" (1960)
• Bruce Heezen & Marie Tharp (Columbia Univ.)
  • mid-ocean ridge
  • abyssal plain
  • trench
• paleomagnetism
• Drummond Matthews & Fred Vine (Cambridge Univ.)
• 1968- Deep Sea Drilling Project

Cold War

• nuclear triad
• 1963 Nuclear Test Ban Treaty
  • seismometers

Geochronology

Hinterzarten/Titisee

isotopes

• samarium/neodymium
• rubidium/strontium
• uranium/lead

precision/accuracy
zircons