Memphis Urban Seismic Hazard Maps, v2008

Memphis has a dense urban population near faults capable of producing major earthquakes. A high probability of a moderate earthquake in the near future (e.g., a 25-40% probability of a magnitude 6.0 or greater in the next 50 years) from the New Madrid seismic zone, and relatively low regional attenuation (in other words, seismic waves do damage over a greater area in this region than for the same magnitude earthquake in the west) necessitates being prepared for earthquake hazards. This dataset provides maps of probabilistic and deterministic earthquake ground motions and liquefaction hazard for the Memphis area. Deterministic ground motion maps show different types of motions for a single specific hypothetical earthquake (scenario or magnitude and location). Deterministic liquefaction maps show the likelihood of exceeding a certain level of liquefaction given the scenario ground motions. Probabilistic ground motion maps show different types of motions for various probability levels, for example, the ground motions that are expected to be exceeded with a 2% probablity in 50 years. Similarly, probabilistic liquefaction maps show the level of liquefaction that is expected to be exceeded for various probability levels. The following maps are available: Probabilistic Maps (graphic.zip/posters.zip) Peak Acceleration (%g) with 10% Probability of Exceedance in 50 Years: pdf, jpg, poster Peak Acceleration (%g) with 2% Probability of Exceedance in 50 Years: pdf, jpg, poster 0.2 sec Spectral Acceleration (%g) with 10% Probability of Exceedance in 50 Years: pdf, jpg, poster 0.2 sec Spectral Acceleration (%g) with 2% Probability of Exceedance in 50 Years: pdf, jpg, poster 1.0 sec Spectral Acceleration (%g) with 10% Probability of Exceedance in 50 Years: pdf, jpg, poster 1.0 sec Spectral Acceleration (%g) with 2% Probability of Exceedance in 50 Years: pdf, jpg, poster Deterministic (Scenario) Maps (graphic.zip/posters.zip) Peak Acceleration (%g) for a M7.7 earthquake located northwest of Memphis, on a fault coincident with the southern linear zone of modern seismicity: pdf, jpg, poster 0.2 sec Spectral Acceleration for a M7.7 earthquake located northwest of Memphis, on a fault coincident with the southern linear zone of modern seismicity: pdf, jpg, poster 1.0 sec Spectral Acceleration (%g) for a M7.7 earthquake located northwest of Memphis, on a fault coincident with the southern linear zone of modern seismicity: pdf, jpg, poster Peak Acceleration (%g) for a M6.2 earthquake located northwest of Memphis, on a fault at the closest end of the southern linear zone of modern seismicity: pdf, jpg, poster 0.2 sec Spectral Acceleration for a M6.2 earthquake located northwest of Memphis, on a fault at the closest end of the southern linear zone of modern seismicity: pdf, jpg, poster 1.0 sec Spectral Acceleration (%g) for a M6.2 earthquake located northwest of Memphis, on a fault at the closest end of the southern linear zone of modern seismicity: pdf, jpg, poster Other Maps (graphic.zip) MMI Hazard for a M7.7 earthquake located northwest of Memphis, on a fault coincident with the southern linear zone of modern seismicity, geology included: gif PGA Hazard for a M7.7 earthquake located northwest of Memphis, on a fault coincident with the southern linear zone of modern seismicity, geology included: gif Memphis/Shelby County average shear-wave velocity over 30 meters: gif The deterministic and probabilistic maps are also available as gridded data values (ascii.zip) Probabilistic Map Grids PGA with 10% PE in 50 yrs PGA with 2% PE in 50 yrs 0.2 sec SA with 10% PE in 50 yrs 0.2 sec SA with 2% PE in 50 yrs 1.0 sec SA with 10% PE in 50 yrs 1.0 sec SA with 2% PE in 50 yrs Deterministic Map Grids PGA for M7.7 scenario earthquake PGA for M6.2 scenario earthquake 0.2 sec SA for M7.7 scenario earthquake 0.2 sec SA for M6.2 scenario earthquake 1.0 sec SA for M7.7 scenario earthquake 1.0 sec SA for M6.2 scenario earthquake and ArcInfo Point Shapefiles (arcgis.zip) with accompanying ArccGIS style file (Memphis.style) Probabilistic Point Grids PGA with 10% PE in 50 yrs PGA with 2% PE in 50 yrs 0.2 sec SA with 10% PE in 50 yrs 0.2 sec SA with 2% PE in 50 yrs 1.0 sec SA with 10% PE in 50 yrs 1.0 sec SA with 2% PE in 50 yrs Deterministic Point Grids PGA for M7.7 scenario earthquake PGA for M6.2 scenario earthquake 0.2 sec SA for M7.7 scenario earthquake 0.2 sec SA for M6.2 scenario earthquake 1.0 sec SA for M7.7 scenario earthquake 1.0 sec SA for M6.2 scenario earthquake Liquefaction Potential maps (liquefaction.zip) Probabilistic Maps Liquefaction Potential Index >5 with 2% Probability of Exceedance in 50 Years: pdf, gif Liquefaction Potential Index >5 with 5% Probability of Exceedance in 50 Years: pdf, gif Liquefaction Potential Index >5 (%g) with 10% Probability of Exceedance in 50 Years: pdf, gif Liquefaction Potential Index >15 with 2% Probability of Exceedance in 50 Years: pdf, gif Liquefaction Potential Index >15 with 5% Probability of Exceedance in 50 Years: pdf, gif Liquefaction Potential Index >15 with 10% Probability of Exceedance in 50 Years: pdf, gif Deterministic (Scenario) Maps Liquefaction Potential Index >5 for a M7.7 earthquake located northwest of Memphis, on a fault coincident with the southern linear zone of modern seismicity: pdf, gif Liquefaction Potential Index >15 for a M7.7 earthquake located northwest of Memphis, on a fault coincident with the southern linear zone of modern seismicity: pdf, gif Liquefaction Potential Index >5 for a M6.2 earthquake located northwest of Memphis, on a fault at the closest end of the southern linear zone of modern seismicity: pdf, gif Liquefaction Potential Index >15 for a M6.2 earthquake located northwest of Memphis, on a fault at the closest end of the southern linear zone of modern seismicity: pdf, gif

孟菲斯（Memphis）城区人口稠密，周边分布着可引发强震的活动断层。新马德里地震带（New Madrid seismic zone）在未来近期发生中等强度地震的概率较高（例如未来50年内发生6.0级及以上地震的概率为25%~40%），且该区域的地震波衰减程度相对较低——换言之，相较于美国西部同震级地震，本区域内地震波的影响范围更广，因此必须做好地震灾害的防范准备。

本数据集提供孟菲斯地区的概率性与确定性地震动、液化灾害相关专题地图。其中，确定性地震动地图展示单次特定假想地震（即情景地震，包含震级与震中位置）对应的不同类型地震动参数；确定性液化灾害地图则展示在给定情景地震动条件下，超过特定液化等级的可能性。概率性地震动地图展示不同超越概率水平下的各类地震动参数，例如未来50年内超越概率为2%的地震动场；同理，概率性液化灾害地图展示不同超越概率水平下的液化等级超越情况。

### 概率性地图（存储于graphic.zip与posters.zip压缩包中）
1. 未来50年超越概率10%的峰值加速度（Peak Acceleration, PGA，%g）：提供pdf、jpg、poster三种格式
2. 未来50年超越概率2%的峰值加速度（%g）：提供pdf、jpg、poster三种格式
3. 未来50年超越概率10%的0.2秒谱加速度（Spectral Acceleration, SA，%g）：提供pdf、jpg、poster三种格式
4. 未来50年超越概率2%的0.2秒谱加速度（%g）：提供pdf、jpg、poster三种格式
5. 未来50年超越概率10%的1.0秒谱加速度（%g）：提供pdf、jpg、poster三种格式
6. 未来50年超越概率2%的1.0秒谱加速度（%g）：提供pdf、jpg、poster三种格式

### 确定性（情景）地震动地图（存储于graphic.zip与posters.zip压缩包中）
1. 孟菲斯西北方向、位于现代地震活动南部线性带对应断层上的M7.7级地震的峰值加速度（%g）：提供pdf、jpg、poster三种格式
2. 孟菲斯西北方向、位于现代地震活动南部线性带对应断层上的M7.7级地震的0.2秒谱加速度：提供pdf、jpg、poster三种格式
3. 孟菲斯西北方向、位于现代地震活动南部线性带对应断层上的M7.7级地震的1.0秒谱加速度（%g）：提供pdf、jpg、poster三种格式
4. 孟菲斯西北方向、位于现代地震活动南部线性带最近端断层上的M6.2级地震的峰值加速度（%g）：提供pdf、jpg、poster三种格式
5. 孟菲斯西北方向、位于现代地震活动南部线性带最近端断层上的M6.2级地震的0.2秒谱加速度：提供pdf、jpg、poster三种格式
6. 孟菲斯西北方向、位于现代地震活动南部线性带最近端断层上的M6.2级地震的1.0秒谱加速度（%g）：提供pdf、jpg、poster三种格式

### 其他专题地图（存储于graphic.zip压缩包中）
1. 孟菲斯西北方向、位于现代地震活动南部线性带对应断层上的M7.7级地震的MMI烈度灾害图（附带地质信息）：gif格式
2. 孟菲斯西北方向、位于现代地震活动南部线性带对应断层上的M7.7级地震的PGA灾害图（附带地质信息）：gif格式
3. 孟菲斯/谢尔比县30米深度平均剪切波速分布图：gif格式

### 栅格数据版本（存储于ascii.zip压缩包中）
#### 概率性地图栅格数据
- 未来50年超越概率10%的PGA
- 未来50年超越概率2%的PGA
- 未来50年超越概率10%的0.2秒SA
- 未来50年超越概率2%的0.2秒SA
- 未来50年超越概率10%的1.0秒SA
- 未来50年超越概率2%的1.0秒SA

#### 确定性地图栅格数据
- M7.7级情景地震PGA
- M6.2级情景地震PGA
- M7.7级情景地震0.2秒SA
- M6.2级情景地震0.2秒SA
- M7.7级情景地震1.0秒SA
- M6.2级情景地震1.0秒SA

### ArcInfo点形状文件及配套样式文件（存储于arcgis.zip压缩包，附带ArcGIS样式文件Memphis.style）
#### 概率性点栅格数据
- 未来50年超越概率10%的PGA
- 未来50年超越概率2%的PGA
- 未来50年超越概率10%的0.2秒SA
- 未来50年超越概率2%的0.2秒SA
- 未来50年超越概率10%的1.0秒SA
- 未来50年超越概率2%的1.0秒SA

#### 确定性点栅格数据
- M7.7级情景地震PGA
- M6.2级情景地震PGA
- M7.7级情景地震0.2秒SA
- M6.2级情景地震0.2秒SA
- M7.7级情景地震1.0秒SA
- M6.2级情景地震1.0秒SA

### 液化势专题地图（存储于liquefaction.zip压缩包中）
#### 概率性液化势地图
1. 未来50年超越概率2%、液化势指数大于5的专题图：pdf、gif格式
2. 未来50年超越概率5%、液化势指数大于5的专题图：pdf、gif格式
3. 未来50年超越概率10%、液化势指数大于5的专题图：pdf、gif格式
4. 未来50年超越概率2%、液化势指数大于15的专题图：pdf、gif格式
5. 未来50年超越概率5%、液化势指数大于15的专题图：pdf、gif格式
6. 未来50年超越概率10%、液化势指数大于15的专题图：pdf、gif格式

#### 确定性（情景）液化势地图
1. 孟菲斯西北方向、位于现代地震活动南部线性带对应断层上的M7.7级地震场景下，液化势指数大于5的专题图：pdf、gif格式
2. 孟菲斯西北方向、位于现代地震活动南部线性带对应断层上的M7.7级地震场景下，液化势指数大于15的专题图：pdf、gif格式
3. 孟菲斯西北方向、位于现代地震活动南部线性带最近端断层上的M6.2级地震场景下，液化势指数大于5的专题图：pdf、gif格式
4. 孟菲斯西北方向、位于现代地震活动南部线性带最近端断层上的M6.2级地震场景下，液化势指数大于15的专题图：pdf、gif格式