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Earthquakes in the U.S. and NYS

Earthquakes in the U.S. and NYS. Earthquake Hazard Map. www.usgs.gov. States with Most Earthquakes. >1 in 30 years. 0 in 30 years. 3. #. www.usgs.gov. # Earthquakes >3.5 bet. 1974 & 2003. [ 1] USGS Top Earthquake States. URL: http://earthquake.usgs.gov/regional/states/top_states.php

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Earthquakes in the U.S. and NYS

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  1. Earthquakes in the U.S. and NYS

  2. Earthquake Hazard Map www.usgs.gov

  3. States with Most Earthquakes >1 in 30 years 0 in 30 years 3 # www.usgs.gov

  4. # Earthquakes >3.5 bet. 1974 & 2003 [1]USGS Top Earthquake States. URL: http://earthquake.usgs.gov/regional/states/top_states.php [2]USGS Historic United States Earthquakes. URL: http://earthquake.usgs.gov/regional/states/historical_state.php#new_york

  5. Historical Earthquakes In and Around New York State ref. S. Nikolaou, “GIS for Ground Motion Evaluation in Seismic Bridge Analysis, Bridge Structures: Assessment, Design and Construction, Edited by Khaled Mahmoud, p. 293, 2005

  6. Fault Lines in Manhattan Charles Merguerian from article of “New York News and Features”

  7. Past Earthquakes in NYS

  8. Examples of past earthquakes in NYS: • 1884 – New York City - M5.5 • 1929 – Attica, New York – M5.2 • 1944 - Between Massena, NY and Cornwall, Ontario, Canada - M5.8, VIII • 1983 - Blue Mountain Lake, New York - M5.3 • 2002 - Au Sable Forks (Plattsburgh area), NY - M5.1 • 2002 - Plattsburgh Aftershock - M3.6 • 2002 - Redford, NY - M3.3 • 2010 – Southern Ontario, Canada, within 70 miles of NYS - M5.0

  9. 26% 28% 19% 18% 31% 35% 21% 13% 23% 14% 37% 36% 24% 25% 14% 36% 53% 19% 11% 39% 27% 19% 29% 24% 16% DC 55% 17% 27% 36% 14% 22% 26% 29% 20% 28% 30% 11% 18% 16% 26% 29% 21% 19% 23% 19% 35% or more 23% 25% 26 - 35% 29% 16 -25% 18% 15% or less 38% 23% Structurally Deficient or Functionally Obsolete Bridges (data from Better Roads Nov. 2009)

  10. Probable Causes • Bridges in the NE are older. (The oldest states and infrastructures are in the Northeast.) • De-icing salts have been used to keep roads safe during hard winters, but they lead to corrosion of structural steel and reinforcing steel • The U.S. steel industry was centered in the NE and bridges have historically been used for bridges. • The NE has major population centers whose growth has caused the older bridge designs to become outdated.

  11. CA State Bridge Inventory 12,559 Bridges • 223 million square feet • Median Age of 41 years Structure Types • 89% Concrete • 7% Steel • 4% Timber Source; Barton Newton, Caltrans 7/1010

  12. Bridges in New York State(state & local) Total highway=17405 Steel=10880  (62.5%) Concrete=5824  (33.5%) The remainder are mostly masonry and timber.  We also have about 90 aluminum culverts. Average age: 45 years Source; Norbert Luft, NYSDOT from April 2010 NBI tables

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