NSHM23 Draft Hazard Maps
Table Of Contents
PGA (g), 2% in 50 year
Download Mean Hazard CSVs: pga_TWO_IN_50.csv pga_TWO_IN_50_comp.csv
Mean hazard maps and comparisons, PGA (g), 2% in 50 year
Primary (NSHM23 Draft) Weighted-Average | Comparison (NSHM18) Weighted-Average |
|---|---|
 |  |
The following plots compare mean hazard between NSHM23 Draft and a comparison model, NSHM18. The top row gives hazard ratios, expressed as % change, and the bottom row gives differences.
The left column compares the mean maps directly, with the comparison model as the divisor/subtrahend. Warmer colors indicate increased hazard in NSHM23 Draft relative to NSHM18.
The right column shows where and by how much the comparison mean model (NSHM18) is outside the distribution of values across all branches of the primary model (NSHM23 Draft). Here, places that are zeros (light gray) indicate that the comparison mean hazard map is fully contained within the range of values in NSHM23 Draft, cool colors indicate areas where the primary model is always lower than the comparison mean model, and warm colors areas where the primary model is always greater. Note that the color scales are reversed here so that colors are consistent with the left column even though the comparison model is now the dividend/minuend.
Mean % Change | Comparison Mean % Change From Extremes |
|---|---|
 |  |
Mean Difference | Comparison Mean Difference From Extremes |
 |  |
Median hazard maps and comparisons, PGA (g), 2% in 50 year
Primary Weighted-Median | Comparison Weighted-Median |
|---|---|
 |  |
This section is the same as above, but using median hazard maps rather than mean.
Median % Change | Comparison Median % Change From Extremes |
|---|---|
 |  |
Median Difference | Comparison Median Difference From Extremes |
 |  |
Percentile comparison maps, PGA (g), 2% in 50 year
The maps below show where the comparison (NSHM18) model mean (left column) and median (right column) map lies within the primary model (NSHM23 Draft) distribution. Areas where the comparison mean or median map is outside the primary model distribution are shown here in black regardless of if they are above or below.
Comparison Mean Percentile | Comparison Median Percentile |
|---|---|
 |  |
Branched-average hazard can be dominated by outlier branches. The map below on the left shows the percentile at which the primary model's mean map lies within its own full hazard distribution. Areas far from the 50-th percentile here are likely outlier-dominated and may show up in percentile comparison maps, even if mean hazard differences are minimal. Keep this in mind when evaluating the maps above, and the influence of individual logic tree branches by this metric. The right map show the ratio of mean to median hazard.
Note: The mean map here is computed directly from mean hazard curves, but the median map is taken as the median value of hazard maps across all branches (rather than first calculating median curves at each location), which might bias this comparison.
| Mean Map Percentile | Mean vs Median |
|---|---|
 |  |
Bounds, spread, and COV, PGA (g), 2% in 50 year
The maps below show the range of values across all logic tree branches, the ratio of the maximum to minimum value, and the coefficient of variation (std. dev. / mean). Note that the minimum and maximum maps are not a result for any single logic tree branch, but rather the smallest or largest value encountered at each location across all logic tree branches.
Minimum | Maximum |
|---|---|
 |  |
Log10 (Max/Min) | COV |
 |  |
PGA (g), 10% in 50 year
Download Mean Hazard CSVs: pga_TEN_IN_50.csv pga_TEN_IN_50_comp.csv
Mean hazard maps and comparisons, PGA (g), 10% in 50 year
Primary (NSHM23 Draft) Weighted-Average | Comparison (NSHM18) Weighted-Average |
|---|---|
 |  |
The following plots compare mean hazard between NSHM23 Draft and a comparison model, NSHM18. The top row gives hazard ratios, expressed as % change, and the bottom row gives differences.
The left column compares the mean maps directly, with the comparison model as the divisor/subtrahend. Warmer colors indicate increased hazard in NSHM23 Draft relative to NSHM18.
The right column shows where and by how much the comparison mean model (NSHM18) is outside the distribution of values across all branches of the primary model (NSHM23 Draft). Here, places that are zeros (light gray) indicate that the comparison mean hazard map is fully contained within the range of values in NSHM23 Draft, cool colors indicate areas where the primary model is always lower than the comparison mean model, and warm colors areas where the primary model is always greater. Note that the color scales are reversed here so that colors are consistent with the left column even though the comparison model is now the dividend/minuend.
Mean % Change | Comparison Mean % Change From Extremes |
|---|---|
 |  |
Mean Difference | Comparison Mean Difference From Extremes |
 |  |
Median hazard maps and comparisons, PGA (g), 10% in 50 year
Primary Weighted-Median | Comparison Weighted-Median |
|---|---|
 |  |
This section is the same as above, but using median hazard maps rather than mean.
Median % Change | Comparison Median % Change From Extremes |
|---|---|
 |  |
Median Difference | Comparison Median Difference From Extremes |
 |  |
Percentile comparison maps, PGA (g), 10% in 50 year
The maps below show where the comparison (NSHM18) model mean (left column) and median (right column) map lies within the primary model (NSHM23 Draft) distribution. Areas where the comparison mean or median map is outside the primary model distribution are shown here in black regardless of if they are above or below.
Comparison Mean Percentile | Comparison Median Percentile |
|---|---|
 |  |
Branched-average hazard can be dominated by outlier branches. The map below on the left shows the percentile at which the primary model's mean map lies within its own full hazard distribution. Areas far from the 50-th percentile here are likely outlier-dominated and may show up in percentile comparison maps, even if mean hazard differences are minimal. Keep this in mind when evaluating the maps above, and the influence of individual logic tree branches by this metric. The right map show the ratio of mean to median hazard.
Note: The mean map here is computed directly from mean hazard curves, but the median map is taken as the median value of hazard maps across all branches (rather than first calculating median curves at each location), which might bias this comparison.
| Mean Map Percentile | Mean vs Median |
|---|---|
 |  |
Bounds, spread, and COV, PGA (g), 10% in 50 year
The maps below show the range of values across all logic tree branches, the ratio of the maximum to minimum value, and the coefficient of variation (std. dev. / mean). Note that the minimum and maximum maps are not a result for any single logic tree branch, but rather the smallest or largest value encountered at each location across all logic tree branches.
Minimum | Maximum |
|---|---|
 |  |
Log10 (Max/Min) | COV |
 |  |
1.0s SA, 2% in 50 year
Download Mean Hazard CSVs: 1.0s_TWO_IN_50.csv 1.0s_TWO_IN_50_comp.csv
Mean hazard maps and comparisons, 1.0s SA, 2% in 50 year
Primary (NSHM23 Draft) Weighted-Average | Comparison (NSHM18) Weighted-Average |
|---|---|
 |  |
The following plots compare mean hazard between NSHM23 Draft and a comparison model, NSHM18. The top row gives hazard ratios, expressed as % change, and the bottom row gives differences.
The left column compares the mean maps directly, with the comparison model as the divisor/subtrahend. Warmer colors indicate increased hazard in NSHM23 Draft relative to NSHM18.
The right column shows where and by how much the comparison mean model (NSHM18) is outside the distribution of values across all branches of the primary model (NSHM23 Draft). Here, places that are zeros (light gray) indicate that the comparison mean hazard map is fully contained within the range of values in NSHM23 Draft, cool colors indicate areas where the primary model is always lower than the comparison mean model, and warm colors areas where the primary model is always greater. Note that the color scales are reversed here so that colors are consistent with the left column even though the comparison model is now the dividend/minuend.
Mean % Change | Comparison Mean % Change From Extremes |
|---|---|
 |  |
Mean Difference | Comparison Mean Difference From Extremes |
 |  |
Median hazard maps and comparisons, 1.0s SA, 2% in 50 year
Primary Weighted-Median | Comparison Weighted-Median |
|---|---|
 |  |
This section is the same as above, but using median hazard maps rather than mean.
Median % Change | Comparison Median % Change From Extremes |
|---|---|
 |  |
Median Difference | Comparison Median Difference From Extremes |
 |  |
Percentile comparison maps, 1.0s SA, 2% in 50 year
The maps below show where the comparison (NSHM18) model mean (left column) and median (right column) map lies within the primary model (NSHM23 Draft) distribution. Areas where the comparison mean or median map is outside the primary model distribution are shown here in black regardless of if they are above or below.
Comparison Mean Percentile | Comparison Median Percentile |
|---|---|
 |  |
Branched-average hazard can be dominated by outlier branches. The map below on the left shows the percentile at which the primary model's mean map lies within its own full hazard distribution. Areas far from the 50-th percentile here are likely outlier-dominated and may show up in percentile comparison maps, even if mean hazard differences are minimal. Keep this in mind when evaluating the maps above, and the influence of individual logic tree branches by this metric. The right map show the ratio of mean to median hazard.
Note: The mean map here is computed directly from mean hazard curves, but the median map is taken as the median value of hazard maps across all branches (rather than first calculating median curves at each location), which might bias this comparison.
| Mean Map Percentile | Mean vs Median |
|---|---|
 |  |
Bounds, spread, and COV, 1.0s SA, 2% in 50 year
The maps below show the range of values across all logic tree branches, the ratio of the maximum to minimum value, and the coefficient of variation (std. dev. / mean). Note that the minimum and maximum maps are not a result for any single logic tree branch, but rather the smallest or largest value encountered at each location across all logic tree branches.
Minimum | Maximum |
|---|---|
 |  |
Log10 (Max/Min) | COV |
 |  |
1.0s SA, 10% in 50 year
Download Mean Hazard CSVs: 1.0s_TEN_IN_50.csv 1.0s_TEN_IN_50_comp.csv
Mean hazard maps and comparisons, 1.0s SA, 10% in 50 year
Primary (NSHM23 Draft) Weighted-Average | Comparison (NSHM18) Weighted-Average |
|---|---|
 |  |
The following plots compare mean hazard between NSHM23 Draft and a comparison model, NSHM18. The top row gives hazard ratios, expressed as % change, and the bottom row gives differences.
The left column compares the mean maps directly, with the comparison model as the divisor/subtrahend. Warmer colors indicate increased hazard in NSHM23 Draft relative to NSHM18.
The right column shows where and by how much the comparison mean model (NSHM18) is outside the distribution of values across all branches of the primary model (NSHM23 Draft). Here, places that are zeros (light gray) indicate that the comparison mean hazard map is fully contained within the range of values in NSHM23 Draft, cool colors indicate areas where the primary model is always lower than the comparison mean model, and warm colors areas where the primary model is always greater. Note that the color scales are reversed here so that colors are consistent with the left column even though the comparison model is now the dividend/minuend.
Mean % Change | Comparison Mean % Change From Extremes |
|---|---|
 |  |
Mean Difference | Comparison Mean Difference From Extremes |
 |  |
Median hazard maps and comparisons, 1.0s SA, 10% in 50 year
Primary Weighted-Median | Comparison Weighted-Median |
|---|---|
 |  |
This section is the same as above, but using median hazard maps rather than mean.
Median % Change | Comparison Median % Change From Extremes |
|---|---|
 |  |
Median Difference | Comparison Median Difference From Extremes |
 |  |
Percentile comparison maps, 1.0s SA, 10% in 50 year
The maps below show where the comparison (NSHM18) model mean (left column) and median (right column) map lies within the primary model (NSHM23 Draft) distribution. Areas where the comparison mean or median map is outside the primary model distribution are shown here in black regardless of if they are above or below.
Comparison Mean Percentile | Comparison Median Percentile |
|---|---|
 |  |
Branched-average hazard can be dominated by outlier branches. The map below on the left shows the percentile at which the primary model's mean map lies within its own full hazard distribution. Areas far from the 50-th percentile here are likely outlier-dominated and may show up in percentile comparison maps, even if mean hazard differences are minimal. Keep this in mind when evaluating the maps above, and the influence of individual logic tree branches by this metric. The right map show the ratio of mean to median hazard.
Note: The mean map here is computed directly from mean hazard curves, but the median map is taken as the median value of hazard maps across all branches (rather than first calculating median curves at each location), which might bias this comparison.
| Mean Map Percentile | Mean vs Median |
|---|---|
 |  |
Bounds, spread, and COV, 1.0s SA, 10% in 50 year
The maps below show the range of values across all logic tree branches, the ratio of the maximum to minimum value, and the coefficient of variation (std. dev. / mean). Note that the minimum and maximum maps are not a result for any single logic tree branch, but rather the smallest or largest value encountered at each location across all logic tree branches.
Minimum | Maximum |
|---|---|
 |  |
Log10 (Max/Min) | COV |
 |  |