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Service Description: Probabilistic seismic-hazard maps were prepared for the conterminous United States portraying peak horizontal acceleration and horizontal spectral response acceleration for 0.2- and 1.0-second periods with probabilities of exceedance of 10 percent in 50 years and 2 percent in 50 years. This particular data set is for horizontal spectral response acceleration for 1.0-second period with a 2 percent probability of exceedance in 50 years. All of the maps were prepared by combining the hazard derived from spatially smoothed historic seismicity with the hazard from fault-specific sources. The acceleration values contoured are the random horizontal component. The reference site condition is firm rock, defined as having an average shear-wave velocity of 760 m/sec in the top 30 meters corresponding to the boundary between NEHRP (National Earthquake Hazards Reduction program) site classes B and C. For more information online visit: http://pubs.usgs.gov/sim/3195/, http://pubs.usgs.gov/of/2008/1128/, and http://earthquake.usgs.gov/hazards/

Map Name: US_1Hz_2PercentIn50Years

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  • USinternational_arcL1 (37)
  • USstates_arcL1 (38)
  • UScounty_arcL1 (39)
  • UScoast_arcL1 (40)
  • US1hz250 1:5M poly (41)
• 1:72,224 (L7) (42)
  • US1hz250 1:5M arc (43)
  • USinternational_arcL1 (44)
  • USstates_arcL1 (45)
  • UScounty_arcL1 (46)
  • UScoast_arcL1 (47)
  • US1hz250 1:5M poly (48)
• 1:144,448 (L8) (49)
  • US1hz250 1:5M arc (50)
  • USinternational_arcL1 (51)
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  • UScounty_arcL1 (53)
  • UScoast_arcL1 (54)
  • US1hz250 1:5M poly (55)
• 1:288,895 (L9) (56)
  • US1hz250 1:5M arc (57)
  • USinternational_arcL1 (58)
  • USstates_arcL8 (59)
  • UScounty_arcL1 (60)
  • UScoast_arcL1 (61)
  • US1hz250 1:5M poly (62)
• 1:577,791 (L10) (63)
  • US1hz250 1:5M arc (64)
  • USinternational_arcL10 (65)
  • USstates_arcL8 (66)
  • UScounty_arcL10 (67)
  • UScoast_arcL1 (68)
  • US1hz250 1:5M poly (69)
• 1:1,155,581 (L11) (70)
  • US1hz250 1:5M arc (71)
  • USinternational_arcL10 (72)
  • USstates_arcL8 (73)
  • UScounty_arcL10 (74)
  • UScoast_arcL1 (75)
  • US1hz250 1:5M poly (76)
• 1:2,311,162 (L12) (77)
  • US1hz250 1:5M arc (78)
  • USinternational_arcL10 (79)
  • USstates_arcL8 (80)
  • UScounty_arcL10 (81)
  • UScoast_arcL12 (82)
  • US1hz250 1:5M poly (83)
• 1:4,622,324 (L13) (84)
  • US1hz250 1:5M arc (85)
  • USinternational_arcL10 (86)
  • USstates_arcL8 (87)
  • UScounty_arcL10 (88)
  • UScoast_arcL12 (89)
  • US1hz250 1:5M poly (90)
• 1:9,244,649 (L14) (91)
  • US1hz250 1:10M arc (92)
  • USinternational_arcL10 (93)
  • USstates_arcL14 (94)
  • UScoast_arcL12 (95)
  • US1hz250 1:10M poly (96)
• 1:18,489,298 (L15) (97)
  • US1hz250 1:15M arc (98)
  • USinternational_arcL15 (99)
  • USstates_arcL14 (100)
  • UScoast_arcL12 (101)
  • US1hz250 1:15M poly (102)
• 1:36,978,595 (L16) (103)
  • US1hz250 1:15M arc (104)
  • USinternational_arcL15 (105)
  • USstates_arcL14 (106)
  • UScoast_arcL12 (107)
  • US1hz250 1:15M poly (108)

Tables:

• ds1hz250_10M (109)
• ds1hz250_15M (110)
• ds1hz250_5M (111)

Description:

Copyright Text: US Geological Survey National Seismic Hazard Mapping Program

Spatial Reference: 102100  (3857)


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Document Info:

Title: US 1Hz 2% in 50 years
Author: Ken Rukstales (rukstales@usgs.gov)
Comments: Probabilistic seismic-hazard maps were prepared for the conterminous United States portraying peak horizontal acceleration and horizontal spectral response acceleration for 0.2- and 1.0-second periods with probabilities of exceedance of 10 percent in 50 years and 2 percent in 50 years. This particular data set is for horizontal spectral response acceleration for 1.0-second period with a 2 percent probability of exceedance in 50 years. All of the maps were prepared by combining the hazard derived from spatially smoothed historic seismicity with the hazard from fault-specific sources. The acceleration values contoured are the random horizontal component. The reference site condition is firm rock, defined as having an average shear-wave velocity of 760 m/sec in the top 30 meters corresponding to the boundary between NEHRP (National Earthquake Hazards Reduction program) site classes B and C. For more information online visit: http://pubs.usgs.gov/sim/3195/, http://pubs.usgs.gov/of/2008/1128/, and http://earthquake.usgs.gov/hazards/
Subject: Horizontal Spectral Response Acceleration for 1.0-second Period with 2% Probability of Exceedance in 50 Years (2008)
Category:
Keywords: earthquake,hazard,1Hz,1.0-second,seismic
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