The New Madrid seismic zone and its influence on seismic hazard. Robin K. McGuire Reinsurance Association of America Meeting February 14, 2018.
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1 The New Madrid seismic zone and its influence on seismic hazard Robin K. McGuire Reinsurance Association of America Meeting February 14, 2018.
2 USGS PGA hazard map, 500-year return period, B-C site, 2014 McGuire, RAA, 2/14/2018, 2/40 USGS National Seismic Hazard Map, 2014
3 Isoseismals of Dec 1811 New Madrid earthquake USGS Prof. Paper 1517, 1993 McGuire, RAA, 2/14/2018, 3/40
4 New Madrid seismic zone and historical seismicity Blue dots: earthquakes through 1972 Red dots: earthquakes since 1972 USGS Fact Sheet McGuire, RAA, 2/14/2018, 4/40
5 Rodinia supercontinent, 750 ma bp Burke Museum website McGuire, RAA, 2/14/2018, 5/40
6 Pangaea supercontinent, 250 ma bp USGS website McGuire, RAA, 2/14/2018, 6/40
7 Pangaea supercontinent overlaid with current political boundaries capitan-mas-ideas website McGuire, RAA, 2/14/2018, 7/40
8 Pangaea supercontinent, 200 ma bp USGS website McGuire, RAA, 2/14/2018, 8/40
9 Pangaea supercontinent, 145 ma bp USGS website McGuire, RAA, 2/14/2018, 9/40
10 Pangaea supercontinent, 65 ma bp USGS website McGuire, RAA, 2/14/2018, 10/40
11 Pangaea supercontinent, present day USGS website McGuire, RAA, 2/14/2018, 11/40
12 Formation of aulacogen over mantle hot-spot Osborne 2017 McGuire, RAA, 2/14/2018, 12/40
13 Formation of aulacogen (failed triple junction in continental crust) Modified from Burke and Whiteman 1973 McGuire, RAA, 2/14/2018, 13/40
14 Mississippi Embayment relief map Wikipedia 2018 McGuire, RAA, 2/14/2018, 14/40
15 Cross-section of current New Madrid rift system Braile 2011 McGuire, RAA, 2/14/2018, 15/40
16 3D view of current New Madrid rift system Osborne 2017 McGuire, RAA, 2/14/2018, 16/40
17 Direction of maximum horizontal crustal stress in North America Potsdam 2008 McGuire, RAA, 2/14/2018, 17/40
18 Earthquake slip mechanisms and causative horizontal and vertical stresses Potsdam 2008 McGuire, RAA, 2/14/2018, 18/40
19 Extent of North American glaciation, 122ka 10ka bp McGuire, RAA, 2/14/2018, 19/40
20 Calculated seismic strain rates in New Madrid area from crustal unloading McGuire, RAA, 2/14/2018, 20/40
21 New Madrid region, crustal stress direction, seismicity, and fault motion Zoback and Zoback 1981 McGuire, RAA, 2/14/2018, 21/40
22 New Madrid faults, and fault models for PSHA CEUS SSC 2012 McGuire, RAA, 2/14/2018, 22/40
23 Depiction of sand blow used to date pre-historic earthquakes Sims and Garvin 1995 McGuire, RAA, 2/14/2018, 23/40
24 New Madrid region and liquefaction features CEUS SSC 2012 McGuire, RAA, 2/14/2018, 24/40
25 New Madrid faults and earthquake sequences CEUS SSC 2012 McGuire, RAA, 2/14/2018, 25/40
26 New Madrid faults and earthquake sequences CEUS SSC 2012 McGuire, RAA, 2/14/2018, 26/40
27 Seismic hazard map based on maximum historical intensities and crustal strain rates, in use prior to 1976 Algermissen 1969 McGuire, RAA, 2/14/2018, 27/40
28 USGS PGA hazard map, 500-year return period, rock, 1976 McGuire, RAA, 2/14/2018, 28/40 USGS National Seismic Hazard Map, 1976
29 USGS PGA hazard map, 500-year return period, rock, 1982 McGuire, RAA, 2/14/2018, 29/40 USGS National Seismic Hazard Map, 1982
30 USGS PGA hazard map, 500-year return period, rock, 1990 McGuire, RAA, 2/14/2018, 30/40 USGS National Seismic Hazard Map, 1990
31 USGS PGA hazard map, 500-year return period, B-C site, 1996 McGuire, RAA, 2/14/2018, 31/40 USGS National Seismic Hazard Map, 1996
32 USGS PGA hazard map, 500-year return period, B-C site, 2002 McGuire, RAA, 2/14/2018, 32/40 USGS National Seismic Hazard Map, 2002
33 USGS PGA hazard map, 500-year return period, B-C site, 2008 McGuire, RAA, 2/14/2018, 33/40 USGS National Seismic Hazard Map, 2008
34 USGS PGA hazard map, 500-year return period, B-C site, 2014 McGuire, RAA, 2/14/2018, 34/40 USGS National Seismic Hazard Map, 2014
35 Alternative views on activity of the New Madrid seismic zone ---Currently the New Madrid region continues to undergo crustal strain, and past earthquake cycles will repeat in the future. Strain can be explained by Holocene deglaciation. ---Currently the New Madrid region is aseismic, and crustal strain either: (a) is effectively zero, or (b) represents post-seismic relaxation from the earthquake sequence McGuire, RAA, 2/14/2018, 35/40
36 Statements about future seismicity in the New Madrid region USGS estimate for a 50-year time period in New Madrid: USGS Fact Sheet , it looks likely that the major earthquakes that have happened (in the New Madrid zone) in the past thousand years are ending, although smaller earthquakes continue. (Seth Stein, Northwestern Univ.) Seth Stein website accessed 2018 McGuire, RAA, 2/14/2018, 36/40
37 Isoseismals of M 6.6 earthquake in Charleston IL 10/31/1895 State of Missouri website accessed January 2018 McGuire, RAA, 2/14/2018, 37/40
38 USGS New Madrid fault geometries: simplified (left) and detailed (right) McGuire, RAA, 2/14/2018, 38/40 USGS OFR (2014 National Seismic Hazard Map documentation
39 USGS logic tree for New Madrid earthquake recurrence intervals simplified fault geometry McGuire, RAA, 2/14/2018, 39/40 USGS OFR (2014 National Seismic Hazard Map documentation
40 USGS logic tree for New Madrid earthquake recurrence intervals detailed fault geometry McGuire, RAA, 2/14/2018, 40/40 USGS OFR (2014 National Seismic Hazard Map documentation
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