Luco, Nicolas
Rezaeian, Sanaz
Rukstales, Kenneth S.
Powers, Peter M.
Shumway, Allison M.
Martinez, Eric M.
Smoczyk, Greg M.
20210611
Gridded uniform hazard peak ground acceleration data and 84th-percentile peak ground acceleration data used to calculate the Maximum Considered Earthquake Geometric Mean (MCEG) peak ground acceleration (PGA) values of the 2020 NEHRP Recommended Seismic Provisions and 2022 ASCE/SEI 7 Standard for American Samoa.
fixed format text files, comma separated values (.csv)
https://doi.org/10.5066/P9I0R4O6
The Maximum Considered Earthquake Geometric Mean (MCEG) peak ground acceleration (PGA) values of the 2020 NEHRP Recommended Seismic Provisions and 2022 ASCE/SEI 7 Standard are derived from the downloadable data files. For each site class, the MCEG peak ground acceleration (PGA_M) is calculated via the following equation:
PGA_M = min[ PGA_MUH, max( PGA_M84th , PGA_MDLL ) ]
where
PGA_MUH = uniform-hazard peak ground acceleration
PGA_M84th = 84th-percentile peak ground acceleration
PGA_MDLL = deterministic lower limit spectral acceleration
The data are used to calculate the Maximum Considered Earthquake Geometric Mean (MCEG) peak ground acceleration (PGA) values of the 2020 NEHRP Recommended Seismic Provisions and 2022 ASCE/SEI 7 Standard.
2020
Unknown
publication date
3-6 years
-172.0
-168.0
-11.0
-15.0
USGS Thesaurus
earthquakes
engineering sciences
hazards
seismology
standards
none
2020 NEHRP
2022 ASCE/SEI 7
Seismic
Risk
USGS Metadata Identifier
USGS:5e71c8bae4b01d50926891bd
http://geonames.usgs.gov/
American Samoa
USA
United States
none
2020
2022
None
The data are not to be used for areas outside American Samoa. Acknowledgment of the U.S. Geological Survey, National Seismic Hazard Mapping Project would be appreciated in products derived from these data.
Nicolas Luco
U.S. Geological Survey - Geologic Hazards Science Center
mailing address
Box 25046, MS 966
Denver
CO
80225
USA
303-273-8683
nluco@usgs.gov
Microsoft Windows 10
This data set is based on a seismological model. The following report provides information on quality assessment for the data set:
Petersen, M.D., Harmsen, S.C., Rukstales, K.S., Mueller, C.S., McNamara, D.E., Luco, Nicolas, and Walling, Melanie, 2012, Seismic hazard of American Samoa and neighboring South Pacific Islandsâ€”Methods, data, parameters, and results: U.S. Geological Survey Open-File Report 2012â€“1087, 98 p. https://pubs.usgs.gov/of/2012/1087/
None.
Data outside the physical boundaries of American Samoa have been included, although they should not be used.
The location of features is based on calculations of a seismological model for the study area. The location of each point is considered to be correct within the confines of computer accuracy.
The gridded data are based on the 2012 Seismic Hazard Model for American Samoa. The uniform-hazard peak ground accelerations are calculated using a suite of hazard curves calculated for an equally spaced grid of points covering American Samoa. The 84th-percentile peak ground accelerations are also derived from the hazard model. There are separate files for NEHRP site classes A, B, B/C, C, C/D, D, D/E, and E.
2015
Vector
Point
6561
0.05
0.05
Decimal degrees
D_WGS_1984
World Geodetic System 1984
6378137
298.257223563
AmSam-2012_Geomean-UHPGA_vs30=1500-siteClass=A_NEHRP-2020.csv
Uniform-hazard peak ground acceleration, geometric mean, NEHRP site class A (Vs30=150 m/s).
USGS
AmSam-2012_Geomean-84thPGA_vs30=1500-siteClass=A_NEHRP-2020.csv
84th-percentile peak ground acceleration, geometric mean, NEHRP site class A (Vs30=1500 m/s).
USGS
AmSam-2012_Geomean-UHPGA_vs30=1080-siteClass=B_NEHRP-2020.csv
Uniform-hazard peak ground acceleration, geometric mean, NEHRP site class B (Vs30=1080 m/s).
USGS
AmSam-2012_Geomean-84thPGA_vs30=1080-siteClass=B_NEHRP-2020.csv
84th-percentile peak ground acceleration, geometric mean, NEHRP site class B (Vs30=1080 m/s).
USGS
AmSam-2012_Geomean-UHPGA_vs30=760-siteClass=BC_NEHRP-2020.csv
Uniform-hazard peak ground acceleration, geometric mean, NEHRP site class B/C (Vs30=760 m/s).
USGS
AmSam-2012_Geomean-84thPGA_vs30=760-siteClass=BC_NEHRP-2020.csv
84th-percentile peak ground acceleration, geometric mean, NEHRP site class B/C (Vs30=760 m/s).
USGS
AmSam-2012_Geomean-UHPGA_vs30=530-siteClass=C_NEHRP-2020.csv
Uniform-hazard peak ground acceleration, geometric mean, NEHRP site class C (Vs30=530 m/s).
USGS
AmSam-2012_Geomean-84thPGA_vs30=530-siteClass=C_NEHRP-2020.csv
84th-percentile peak ground acceleration, geometric mean, NEHRP site class C (Vs30=530 m/s).
USGS
AmSam-2012_Geomean-UHPGA_vs30=365-siteClass=CD_NEHRP-2020.csv
Uniform-hazard peak ground acceleration, geometric mean, NEHRP site class C/D (Vs30=365 m/s).
USGS
AmSam-2012_Geomean-84thPGA_vs30=365-siteClass=CD_NEHRP-2020.csv
84th-percentile peak ground acceleration, geometric mean, NEHRP site class C/D (Vs30=365 m/s).
USGS
AmSam-2012_Geomean-UHPGA_vs30=260-siteClass=D_NEHRP-2020.csv
Uniform-hazard peak ground acceleration, geometric mean, NEHRP site class D (Vs30=260 m/s).
USGS
AmSam-2012_Geomean-84thPGA_vs30=260-siteClass=D_NEHRP-2020.csv
84th-percentile peak ground acceleration, geometric mean, NEHRP site class D (Vs30=260 m/s).
USGS
AmSam-2012_Geomean-UHPGA_vs30=185-siteClass=DE_NEHRP-2020.csv
Uniform-hazard peak ground acceleration, geometric mean, NEHRP site class D/E (Vs30=185 m/s).
USGS
AmSam-2012_Geomean-84thPGA_vs30=185-siteClass=DE_NEHRP-2020.csv
84th-percentile peak ground acceleration, geometric mean, NEHRP site class D/E (Vs30=185 m/s).
USGS
AmSam-2012_Geomean-UHPGA_vs30=150-siteClass=E_NEHRP-2020.csv
Uniform-hazard peak ground acceleration, geometric mean, NEHRP site class E (Vs30=150 m/s).
USGS
AmSam-2012_Geomean-84thPGA_vs30=150-siteClass=E_NEHRP-2020.csv
84th-percentile peak ground acceleration, geometric mean, NEHRP site class E (Vs30=150 m/s).
USGS
These files contain a grid of points. The first line is the header line. Subsequent lines contain the latitude and longitude of the point followed by the uniform-hazard peak ground acceleration, or 84th-percentile peak ground acceleration value for that single geographic point. Acceleration values are in units of g.
none
U.S. Geological Survey - ScienceBase
mailing address
Denver Federal Center, Building 810, Mail Stop 302
Lakewood
CO
80215
USA
1-888-275-8747
sciencebase@usgs.gov
Downloadable fixed format data file in ASCII text format.
Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this information product, for the most part, is in the public domain, it also contains copyrighted materials as noted in the text. Permission to reproduce copyrighted items must be secured from the copyright owner whenever applicable. The data have been approved for release and publication by the U.S. Geological Survey (USGS). Although the data have been subjected to rigorous review and are substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, the data are released on the condition that neither the USGS nor the U.S. Government may be held liable for any damages resulting from authorized or unauthorized use. Although the data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made regarding the display or utility of the data on any other system, or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. The U.S. Geological Survey shall not be held liable for improper or incorrect use of the data described and/or contained herein. Users of the data are advised to read all metadata and associated documentation thoroughly to understand appropriate use and data limitations.
fixed format text file (csv)
1.0
comma separated values
Gridded data used to determine maximum considered earthquake geometric mean peak ground accelerations for American Samoa for the 2020 NEHRP Recommended Seismic Provisions and 2022 ASCE/SEI 7.
Files may need to be decompressed using winzip or similar utility
0.4
https://doi.org/10.5066/P9I0R4O6
none
20210611
U.S. Geological Survey - Geologic Hazards Science Center
Ken Rukstales
mailing address
Box 25046, MS 966
Lakewood
CO
80225
USA
303-273-8677
ghsc_metadata@usgs.gov
FGDC Content Standards for Digital Geospatial Metadata
FGDC-STD-001-1998
local time