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Service Description: Probabilistic seismic-hazard maps were prepared for Alaska 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 peak horizontal acceleration with a 10 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.er.usgs.gov/publication/i2679, http://pubs.er.usgs.gov/publication/ofr9936, and http://earthquake.usgs.gov/hazards/

Map Name: AK_PGA_10PercentIn50Years

Legend

All Layers and Tables

Layers:

• 1:1,128 (L1) (0)
  • AKpga050 1:5M arc (1)
  • AKinternational_arcL1 (2)
  • AKcounty_arcL1 (3)
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  • AKpga050 1:5M poly (5)
• 1:2,257 (L2) (6)
  • AKpga050 1:5M arc (7)
  • AKinternational_arcL1 (8)
  • AKcounty_arcL1 (9)
  • AKcoast_arcL1 (10)
  • AKpga050 1:5M poly (11)
• 1:4,514 (L3) (12)
  • AKpga050 1:5M arc (13)
  • AKinternational_arcL1 (14)
  • AKcounty_arcL1 (15)
  • AKcoast_arcL1 (16)
  • AKpga050 1:5M poly (17)
• 1:9,028 (L4) (18)
  • AKpga050 1:5M arc (19)
  • AKinternational_arcL1 (20)
  • AKcounty_arcL1 (21)
  • AKcoast_arcL1 (22)
  • AKpga050 1:5M poly (23)
• 1:18,056 (L5) (24)
  • AKpga050 1:5M arc (25)
  • AKinternational_arcL1 (26)
  • AKcounty_arcL1 (27)
  • AKcoast_arcL1 (28)
  • AKpga050 1:5M poly (29)
• 1:36,112 (L6) (30)
  • AKpga050 1:5M arc (31)
  • AKinternational_arcL1 (32)
  • AKcounty_arcL1 (33)
  • AKcoast_arcL1 (34)
  • AKpga050 1:5M poly (35)
• 1:72,224 (L7) (36)
  • AKpga050 1:5M arc (37)
  • AKinternational_arcL1 (38)
  • AKcounty_arcL1 (39)
  • AKcoast_arcL1 (40)
  • AKpga050 1:5M poly (41)
• 1:144,448 (L8) (42)
  • AKpga050 1:5M arc (43)
  • AKinternational_arcL1 (44)
  • AKcounty_arcL1 (45)
  • AKcoast_arcL1 (46)
  • AKpga050 1:5M poly (47)
• 1:288,895 (L9) (48)
  • AKpga050 1:5M arc (49)
  • AKinternational_arcL1 (50)
  • AKcounty_arcL1 (51)
  • AKcoast_arcL1 (52)
  • AKpga050 1:5M poly (53)
• 1:577,791 (L10) (54)
  • AKpga050 1:5M arc (55)
  • AKinternational_arcL10 (56)
  • AKcounty_arcL10 (57)
  • AKcoast_arcL1 (58)
  • AKpga050 1:5M poly (59)
• 1:1,155,581 (L11) (60)
  • AKpga050 1:5M arc (61)
  • AKinternational_arcL10 (62)
  • AKcounty_arcL10 (63)
  • AKcoast_arcL1 (64)
  • AKpga050 1:5M poly (65)
• 1:2,311,162 (L12) (66)
  • AKpga050 1:5M arc (67)
  • AKinternational_arcL10 (68)
  • AKcounty_arcL10 (69)
  • AKcoast_arcL12 (70)
  • AKpga050 1:5M poly (71)
• 1:4,622,324 (L13) (72)
  • AKpga050 1:5M arc (73)
  • AKinternational_arcL10 (74)
  • AKcounty_arcL10 (75)
  • AKcoast_arcL12 (76)
  • AKpga050 1:5M poly (77)
• 1:9,244,649 (L14) (78)
  • AKpga050 1:10M arc (79)
  • AKinternational_arcL10 (80)
  • AKcoast_arcL12 (81)
  • AKpga050 1:10M poly (82)
• 1:18,489,298 (L15) (83)
  • AKpga050 1:15M arc (84)
  • AKinternational_arcL15 (85)
  • AKcoast_arcL12 (86)
  • AKpga050 1:15M poly (87)
• 1:36,978,595 (L16) (88)
  • AKpga050 1:15M arc (89)
  • AKinternational_arcL15 (90)
  • AKcoast_arcL12 (91)
  • AKpga050 1:15M poly (92)

Tables:

• dspga050_15M (93)
• dspga050_10M (94)
• dspga050_5M (95)

Description:

Copyright Text: US Geological Survey National Seismic Hazard Mapping Program

Spatial Reference: 102100  (3857)


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Document Info:

Title: AK pga 10% in 50 years
Author: Ken Rukstales (rukstales@usgs.gov)
Comments: Probabilistic seismic-hazard maps were prepared for Alaska 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 peak horizontal acceleration with a 10 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.er.usgs.gov/publication/i2679, http://pubs.er.usgs.gov/publication/ofr9936, and http://earthquake.usgs.gov/hazards/
Subject: Peak Horizontal Acceleration with 10% Probability of Exceedance in 50 Years (1999)
Category:
Keywords: earthquake,hazard,pga,seismic,Alaska
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