3-12 - Earthquakes: Historic Quakes 2008-03-12 3 Major U.S....

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Earthquakes: Historic Quakes 16:17 3 Major U.S. Quakes New Madrid (Missouri), 1811-1812, intraplate San Francisco, 1906, transform boundary Alaska, 1964, subduction zone New Madrid Missouri Zone of weakness within the plate A rift began opening 750 million years ago, then stopped Chronology o 4 main shocks o 1 st  Dec. 16 1811 around 2 pm o 2 nd  quake, same day around 8 pm estimated magnitudes: 7.2 and 8.0 Intensity ~ VII o 3 rd  quake January 23 rd  1812 o 4 th  and largest on February 7 1812 estimated magnitude 8.2 estimated intensity X-XI o ground constantly trembled from Dec. – Feb. o Estimated 200 moderate quakes Effects o Area sparsely settled, little loss of life o Shaking felt throughout eastern U.S. o Uplift and dropping of land o Massive liquefaction, many sand boils Future Quakes
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Area is still seismically active Large quakes may occur every 200-500 years
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 09/23/2008 for the course GEOL 105 taught by Professor Kohut during the Spring '08 term at University of Delaware.

Page1 / 5

3-12 - Earthquakes: Historic Quakes 2008-03-12 3 Major U.S....

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online