Identification_Information: Citation: Citation_Information: Originator: Pacific Northwest Seismic Network (PNSN) and the U.S. Geological Survey Publication_Date: 2017-04-15 Publication_Time: 14:48:35 UTC Title: Advanced National Seismic System (ANSS), ShakeMap, Pacific Northwest Region, Maps of ground shaking and intensity for event 61271121, 50.2 km (31.2 mi) WSW of Newport, OR Edition: Map Version 4; Code Version 3.5 Geospatial_Data_Presentation_Form: Map Online_Linkage: http://earthquake.usgs.gov/eqcenter/shakemap Description: Abstract: ShakeMap is designed as a rapid response tool to portray the extent and variation of ground shaking throughout the affected region immediately following significant earthquakes. Ground motion and intensity maps are derived from peak ground motion amplitudes recorded on seismic sensors (accelerometers), with interpolation based on both estimated amplitudes where data are lacking, and site amplification corrections. Color-coded instrumental intensity maps are derived from empirical relations between peak ground motions and Modified Mercalli intensity. This ShakeMap describes the event: 61271121, 50.2 km (31.2 mi) WSW of Newport, OR Purpose: As a rapid response tool, the ShakeMap ground motion values are used for emergency response, loss estimation, assessment of damage to the lifeline and utility networks, and for providing information to the general public. Time_Period_of_Content: Currentness_Reference: ground condition Time_Period_Information: Single_Date/Time: Calendar_Date: 2017-04-15 Time_of_Day: 14:48:35 UTC Status: Progress: Complete Maintenance_and_Update_Frequency: As needed Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -125.36930000000000 East_Bounding_Coordinate: -123.86930000000000 North_Bounding_Coordinate: 44.97120000000000 South_Bounding_Coordinate: 43.90020000000000 Keywords: Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: ShakeMap Theme_Keyword: peak ground motions Theme_Keyword: shaking intensity Theme_Keyword: instrumental intensity Theme_Keyword: earthquake damage Theme_Keyword: Advanced National Seismic Systems (ANSS) Theme_Keyword: Pacific Northwest Seismic Network (PNSN) Place: Place_Keyword_Thesaurus: None Place_Keyword: Pacific Northwest Place_Keyword: Washington Place_Keyword: Oregon Access_Constraints: none Use_Constraints: none Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: Pacific Northwest Seismic Network (PNSN) Contact_Person: Renate Hartog or Paul Bodin Contact_Position: Seismologist Contact_Address: Address_Type: mailing Address: Box 351310 City: Seattle State_or_Province: Washington Postal_Code: 98195 Country: USA Contact_Voice_Telephone: N/A Contact_Facsimile_Telephone: N/A Contact_Electronic_Mail_Address: N/A Browse_Graphic: Browse_Graphic_File_Name: http://www.pnsn.org/shakemap/61271121/intensity.html Browse_Graphic_File_Description: Instrumental Intensity ShakeMap within a web page; all other ShakeMap maps and products can be accessed from this site. Typically the image itself is 600x400 pixels and about 100k bytes in size. Browse_Graphic_File_Type: JPEG Cross_Reference: Citation_Information: Originator: Wald, D.J. Originator: Quitoriano, V. Originator: Heaton, T.H. Originator: Kanamori, H. Originator: Scrivner, C.W. Originator: Worden, C.B. Title: TriNet "ShakeMaps": rapid generation of instrumental ground motion and intensity maps for earthquakes in Southern California Publication_Date: 1999 Series_Information: Series_Name: Earthquake Spectra Issue_Identification: Vol. 15, No. 3 Other_Citation_Details: pp 537-556 Online_Linkage: http://www.pnsn.org/shakemap/about.html#references Cross_Reference: Citation_Information: Originator: Wald, D.J. Originator: Quitoriano, V. Originator: Heaton, T.H. Originator: Kanamori, H. Title: Relationship between Peak Ground Acceleration, Peak Ground Velocity, and Modified Mercalli Intensity for Earthquakes in California Publication_Date: 1999 Series_Information: Series_Name: Earthquake Spectra Issue_Identification: Vol. 15, No. 3 Other_Citation_Details: pp 557-564 Online_Linkage: http://www.pnsn.org/shakemap/about.html#references Cross_Reference: Citation_Information: Originator: Wald, D.J. Originator: Worden, C.B. Originator: Quitoriano, V. Originator: Pankow, K. Title: ShakeMap Manual: Users Guide, Technical Manual, and Software Guide, USGS Techniques and Methods 12-A1 Publication_Date: 2005 Series_Information: Series_Name: U.S. Geological Survey [Open File Report] Issue_Identification: [ZZZ-03] Other_Citation_Details: [128 pp] Online_Linkage: http://pubs.usgs.gov/tm/2005/12A01/ Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Slight variations in peak ground motions and spectral values may depend on processing. Corrections or changes in station and amplitude information are reflected by the authoritative seismic network. In addition, changes in magnitude may result in changes to estimated ground motions in areas with sparse seismic station coverage. Completeness_Report: Included in this version are data available up to the time processed. Additional data (seismic stations) may be added at a later time. Logical_Consistency_Report: Ground motion data are direct measurements only at the location of seismic stations; all other data are interpolated (as described in the citations). Seismic station coverage varies in density as well as instrumentation across the region in question. Uncertainty in the reported ground motions generally increases with distance from seismic stations, and in areas of very low station density may be largely the product of empirical relationships. Uncertainties in ground motions may also arise from inaccurate ground motion amplitudes from seismic stations, or inaccurate information regarding earthquake epicenter or magnitude, as reported by the generating network. Lineage: Process_Step: Process_Description: Shaking maps are prepared by contouring shaking information interpolated onto a square grid uniformly sampled at a spacing of 1 minute (about 1.6 km) throughout California. If there were stations at each of the tens of thousands of grid points, then the creation of shaking maps would be relatively simple. Of course stations are not available for all of these grid points, and in many cases grid points may be tens of kilometers from the nearest reporting station. The overall mapping philosophy is to combine information from individual stations, geology (representing site amplification), and the distance to the epicenter or causative fault to create the best composite map. The procedure produces reasonable estimates at grid points located far from available data, while preserving the detailed shaking information available for regions where there are stations nearby. Estimation of shaking over the regional extent for an earthquake in California is obtained by the spatial interpolation of the measured ground motions with geologically based frequency and amplitude-dependent site corrections. We use the California Site Condition Map (California Geological Survey, CGS) maps of National Earthquake Hazard Reduction Program (NEHRP) classification site conditions as the basis for our site corrections. These site condition maps have coverage throughout the state at 1:250,000 scale (Wills et al., 2000). We use the amplification factors of Borcherdt et al. (1994). In addition, ShakeMap ground motions in regions of sparse station spacing are estimated using ground motion regression, initially from a point location at the epicenter. Later, as information about fault dimensions became available (in the form of aftershocks, source rupture models, and observed surface slip), the fault location and rupture dimensions are used as the basis for ground motion estimation. First, peak ground motion parameters are recovered for each station and associated with a particular earthquake origin time and epicenter. We then create a coarse, uniformly spaced grid of 30-km spaced "phantom" stations. Peak ground motions and spectral acceleration values are assigned to each coarse grid point using a ground motion attenuation relationship for rock sites given the magnitude of the earthquake and distance to each grid point. In practice, we apply a static correction to the amplitudes of the regression by using the network-determined magnitude, predicting the observed amplitudes, and correcting for an amplitude bias term between the predictions and the data. ShakeMap uses estimated ground motions in areas with sparse seismic station coverage. For crustal earthquakes (depth < 35km) of magnitude smaller than 7.2 the PNSN ShakeMap uses a the Chiou and Youngs (2008) amplitude attenuation relation derived for southern California. We use Zhao et al. (2006) to predict the attenuation of ground motions for subduction zone interface (moderate magnitude and shallow, or very large, i.e. M >= 7.2) as well as interface (deeper, M<7.2) events. Site corrections are then used to interpolate from ground motions recorded on a fairly sparse, non-uniformly spaced network of stations to maps showing spatially continuous functions (i.e., contours). Prior to interpolation, we reduce the ground motion amplitudes to a common reference, in this case bedrock motions. Peak ground motion amplitudes from the seismic stations are corrected to rock site conditions; and the observations (corrected to rock) and the coarse phantom stations (computed for rock) are then interpolated to a fine rock site grid (roughly 1.6-km spacing). We scale the peak acceleration (PGA) amplitude with the Borcherdt et al. (1994) short-period amplification factors while the peak ground velocity (PGV) values are corrected with the mid-period factors. Response spectral values are scaled by the short-period factors at 0.3 sec, and by the mid-period response at 1.0 and 3.0 seconds. The site correction procedure is applied so that the original data values are returned at each station; hence, the actual recorded motions are preserved in the process and the final contours reflect the observations wherever they exist. Next, the interpolated rock grid is corrected at each point for local site amplification and instrumental intensity map is generated by relating the peak ground acceleration or velocity at each grid point to intensity as described by Wald et al. (1999). This fine grid is saved and exported to the file "grid.xyz". A continuous surface is also fit to the fine grid to produce the contour maps and GIS formatted maps. Process_Date: 2017-04-15 Process_Time: 14:48:35 UTC Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Geographic: Latitude_Resolution: 0.00554922279793 Longitude_Resolution: 0.00555555555556 Geographic_Coordinate_Units: Decimal degrees Geodetic_Model: Horizontal_Datum_Name: World Geodetic System 1984 Ellipsoid_Name: WGS 84 Semi-major_Axis: 6378137 Denominator_of_Flattening_Ratio: 298.257 Entity_and_Attribute_Information: Overview_Description: Entity_and_Attribute_Overview: File grid.xyz Values of the peak amplitudes at the ShakeMap map grid nodes. File is ASCII text in the following format: First line is a header, space-delimited, with all of the following: ><name/CUSPID of event> <mag> <epicentral lat> <epicentral lon> ><MMM DD YYYY> <HH:MM:SS timezone> ><W bound> <S bound> <E bound> <N bound> >(Process time: <time>) <Location String> The first 'time' field is the time of the event. 'Process time' is the time this file was last updated. For large or historic earthquakes the "Location String" will usually be the name of the earthquake, otherwise it will be something of the form "12.1 mi. SSW of Carpinteria, CA" The remaining lines are of the form: ><lon> <lat> <pga> <pgv> <mmi> <psa03> <psa10> <psa30> >pga = peak ground motion (acceleration, as percent of g) >pgv = peak ground motion (velocity in cm/s) >mmi = estimated instrumental intensity >psa03 = spectral acceleration at 0.3 s period, 5% damping (percent of g) >psa10 = spectral acceleration at 1.0 s period, 5% damping (percent of g) >psa30 = spectral acceleration at 3.0 s period, 5% damping (percent of g) Entity_and_Attribute_Detail_Citation: http://www.pnsn.org/shakemap/61271121/about_formats.html#xyz Overview_Description: Entity_and_Attribute_Overview: File grid.xml Specifies the earthquake and ShakeMap parameters, and values of the peak amplitudes at the ShakeMap map grid nodes. File is XML text. Entity_and_Attribute_Detail_Citation: http://www.pnsn.org/shakemap/61271121/about_formats.html#xml Detailed_Description: Entity_Type: Entity_Type_Label: mmi.dbf (shapefile from "shape.zip" download file) Entity_Type_Definition: Polygons of estimated instrumental intensity Entity_Type_Definition_Source: ESRI Shapefile Technical Description Attribute: Attribute_Label: GRID_CODE Attribute_Definition: Estimated instrumental intensity (double) Attribute_Definition_Source: Wald, et al., Relationship between Peak Ground Acceleration, Peak Ground Velocity, and Modified Mercalli Intensity for Earthquakes in California, Earthquake Spectra, Vol. 15, No. 3, 1999, pp 557-564. Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.0 Range_Domain_Maximum: 10.0 Attribute_Units_of_Measure: Intensity Attribute_Measurement_Resolution: 0.1 Attribute: Attribute_Label: VALUE Attribute_Definition: Estimated instrumental intensity (double) Attribute_Definition_Source: Wald, et al., Relationship between Peak Ground Acceleration, Peak Ground Velocity, and Modified Mercalli Intensity for Earthquakes in California, Earthquake Spectra, Vol. 15, No. 3, 1999, pp 557-564. Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.0 Range_Domain_Maximum: 10.0 Attribute_Units_of_Measure: Intensity Attribute_Measurement_Resolution: 0.1 Detailed_Description: Entity_Type: Entity_Type_Label: pga.dbf (shapefile from "shape.zip" download file) Entity_Type_Definition: Polygons of peak ground motion (acceleration) Entity_Type_Definition_Source: ESRI Shapefile Technical Description Attribute: Attribute_Label: GRID_CODE Attribute_Definition: Peak ground motion (acceleration, as integer percent of g) Attribute_Definition_Source: self-evident Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -200.0 Range_Domain_Maximum: 200.0 Attribute_Units_of_Measure: percent of g Attribute_Measurement_Resolution: 4 Attribute: Attribute_Label: VALUE Attribute_Definition: Peak ground motion (acceleration, as fraction of g) Attribute_Definition_Source: self-evident Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -200.0 Range_Domain_Maximum: 200.0 Attribute_Units_of_Measure: fraction of g Attribute_Measurement_Resolution: 0.04 Detailed_Description: Entity_Type: Entity_Type_Label: pgv.dbf (shapefile from "shape.zip" download file) Entity_Type_Definition: Polygons of peak ground motion (velocity) Entity_Type_Definition_Source: ESRI Shapefile Technical Description Attribute: Attribute_Label: GRID_CODE Attribute_Definition: Peak ground motion (velocity in cm/s, integer) Attribute_Definition_Source: self-evident Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -500.0 Range_Domain_Maximum: 500.0 Attribute_Units_of_Measure: cm/s Attribute_Measurement_Resolution: 4 Attribute: Attribute_Label: VALUE Attribute_Definition: Peak ground motion (velocity in cm/s, double) Attribute_Definition_Source: self-evident Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -500.0 Range_Domain_Maximum: 500.0 Attribute_Units_of_Measure: cm/s Attribute_Measurement_Resolution: 4 Detailed_Description: Entity_Type: Entity_Type_Label: psa03.dbf (shapefile (from "shape.zip" download file) Entity_Type_Definition: Polygons of spectral acceleration at 0.3 s period, 5% damping Entity_Type_Definition_Source: ESRI Shapefile Technical Description Attribute: Attribute_Label: GRID_CODE Attribute_Definition: Spectral acceleration at 0.3 s period, 5% damping (integer percent of g) Attribute_Definition_Source: self-evident Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -400.0 Range_Domain_Maximum: 400.0 Attribute_Units_of_Measure: percent of g Attribute_Measurement_Resolution: 4 Attribute: Attribute_Label: VALUE Attribute_Definition: Spectral acceleration at 0.3 s period, 5% damping (fraction of g) Attribute_Definition_Source: self-evident Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -400.0 Range_Domain_Maximum: 400.0 Attribute_Units_of_Measure: fraction of g Attribute_Measurement_Resolution: 0.04 Detailed_Description: Entity_Type: Entity_Type_Label: psa10.dbf (shapefile from "shape.zip" download file) Entity_Type_Definition: Polygons of spectral acceleration at 1.0 s period, 5% damping Entity_Type_Definition_Source: ESRI Shapefile Technical Description Attribute: Attribute_Label: GRID_CODE Attribute_Definition: Spectral acceleration at 1.0 s period, 5% damping (integer percent of g) Attribute_Definition_Source: self-evident Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -400.0 Range_Domain_Maximum: 400.0 Attribute_Units_of_Measure: percent of g Attribute_Measurement_Resolution: 4 Attribute: Attribute_Label: VALUE Attribute_Definition: Spectral acceleration at 1.0 s period, 5% damping (fraction of g) Attribute_Definition_Source: self-evident Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -400.0 Range_Domain_Maximum: 400.0 Attribute_Units_of_Measure: fraction of g Attribute_Measurement_Resolution: 0.04 Detailed_Description: Entity_Type: Entity_Type_Label: psa30.dbf (shapefile from "shape.zip" download file) Entity_Type_Definition: Polygons of spectral acceleration at 3.0 s period, 5% damping Entity_Type_Definition_Source: ESRI Shapefile Technical Description Attribute: Attribute_Label: GRID_CODE Attribute_Definition: Spectral acceleration at 3.0 s period, 5% damping (integer percent of g) Attribute_Definition_Source: self-evident Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 2 Range_Domain_Maximum: 34 Attribute_Units_of_Measure: percent of g Attribute_Measurement_Resolution: 4 Attribute: Attribute_Label: VALUE Attribute_Definition: Spectral acceleration at 3.0 s period, 5% damping (fraction of g) Attribute_Definition_Source: self-evident Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -400.0 Range_Domain_Maximum: 400.0 Attribute_Units_of_Measure: fraction of g Attribute_Measurement_Resolution: 0.04 Detailed_Description: Entity_Type: Entity_Type_Label: pga.dbf (shapefile from "hazus.zip" download file) Entity_Type_Definition: Polygons of "mean" ground motion (acceleration), scaled from recorded peak values by 15% (empirical correction from peak to mean) to conform to HAZUS input requirements. Entity_Type_Definition_Source: ESRI Shapefile Technical Description Attribute: Attribute_Label: GRID_CODE Attribute_Definition: Mean ground motion (acceleration, as integer percent of g) Attribute_Definition_Source: self-evident Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -200.0 Range_Domain_Maximum: 200.0 Attribute_Units_of_Measure: percent of g Attribute_Measurement_Resolution: 4 Attribute: Attribute_Label: VALUE Attribute_Definition: Mean ground motion (acceleration, as fraction of g) Attribute_Definition_Source: self-evident Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -200.0 Range_Domain_Maximum: 200.0 Attribute_Units_of_Measure: fraction of g Attribute_Measurement_Resolution: 0.04 Detailed_Description: Entity_Type: Entity_Type_Label: pgv.dbf (shapefile (from "hazus.zip" download file) Entity_Type_Definition: Polygons of "mean" ground motion (velocity), scaled from recorded peak values by 15% (empirical correction from peak to mean) to conform to HAZUS input requirements. Entity_Type_Definition_Source: ESRI Shapefile Technical Description Attribute: Attribute_Label: GRID_CODE Attribute_Definition: Mean ground motion (velocity in inches/sec, integer) Attribute_Definition_Source: self-evident Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -200.0 Range_Domain_Maximum: 200.0 Attribute_Units_of_Measure: cm/s Attribute_Measurement_Resolution: 2 Attribute: Attribute_Label: VALUE Attribute_Definition: Mean ground motion (velocity in inches/s, double) Attribute_Definition_Source: self-evident Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -500.0 Range_Domain_Maximum: 500.0 Attribute_Units_of_Measure: cm/s Attribute_Measurement_Resolution: 2.0 Detailed_Description: Entity_Type: Entity_Type_Label: psa03.dbf (shapefile from "hazus.zip" download file) Entity_Type_Definition: Polygons of "mean" spectral acceleration at 0.3 s period, 5% damping, scaled from recorded peak values by 15% (empirical correction from peak to mean) to conform to HAZUS input requirements. Entity_Type_Definition_Source: ESRI Shapefile Technical Description Attribute: Attribute_Label: GRID_CODE Attribute_Definition: Mean Spectral acceleration at 0.3 s period, 5% damping (integer percent of g) Attribute_Definition_Source: self-evident Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -400.0 Range_Domain_Maximum: 400.0 Attribute_Units_of_Measure: percent of g Attribute_Measurement_Resolution: 4 Attribute: Attribute_Label: VALUE Attribute_Definition: Mean spectral acceleration at 0.3 s period, 5% damping (fraction of g), scaled from recorded peak values by 15% (empirical correction from peak to mean) to conform to HAZUS input requirements. Attribute_Definition_Source: self-evident Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -400.0 Range_Domain_Maximum: 400.0 Attribute_Units_of_Measure: fraction of g Attribute_Measurement_Resolution: 0.04 Detailed_Description: Entity_Type: Entity_Type_Label: psa10.dbf (shapefile from "hazus.zip" download file) Entity_Type_Definition: Polygons of mean spectral acceleration at 1.0 s period, 5% damping, scaled from recorded peak values by 15% (empirical correction from peak to mean) to conform to HAZUS input requirements. Entity_Type_Definition_Source: ESRI Shapefile Technical Description Attribute: Attribute_Label: GRID_CODE Attribute_Definition: Mean spectral acceleration at 1.0 s period, 5% damping (integer percent of g) Attribute_Definition_Source: self-evident Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -400.0 Range_Domain_Maximum: 400.0 Attribute_Units_of_Measure: percent of g Attribute_Measurement_Resolution: 4 Attribute: Attribute_Label: VALUE Attribute_Definition: Mean spectral acceleration at 1.0 s period, 5% damping (fraction of g), scaled from recorded peak values by 15% (empirical correction from peak to mean) to conform to HAZUS input requirements. Attribute_Definition_Source: self-evident Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -400.0 Range_Domain_Maximum: 400.0 Attribute_Units_of_Measure: fraction of g Attribute_Measurement_Resolution: 0.04 Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: United States Geological Survey, Advanced National Seismic System (ANSS) Contact_Person: David J Wald Contact_Position: Geophysicist Contact_Address: Address_Type: mailing address Address: P.O. Box 25046 City: Lakewood State_or_Province: CO Postal_Code: 80225 Country: USA Contact_Voice_Telephone: 303-273-8441 Contact_Facsimile_Telephone: (303) 273-8600 Contact_Electronic_Mail_Address: wald@usgs.gov Resource_Description: Shakemap data for 61271121 Distribution_Liability: Some USGS information accessed through this page may be preliminary in nature and presented prior to final review and approval by the Director of the USGS. This information is provided with the understanding that it is not guaranteed to be correct or complete, and conclusions drawn from such information are the sole responsibility of the user. These are automatic computer generated maps and have not necessarily been checked by human oversight, so they may contain errors. Further, the input data is raw and unchecked, and may contain errors. Contours can be misleading since data gaps may exist. Caution should be used in deciding which features in the contour patterns are required by the data. Ground motions and intensities can vary greatly over small distances, so these maps are only approximate; when maps are enlarged beyond the limits of the original data in an effort to show small areas, the maps are unreliable. These maps are preliminary in nature and will be updated as data arrives from distributed sources. The estimated intensity map is derived from ground motions recorded by seismographs and represents Modified Mercalli Intensities (MMI's) that are likely to have been associated with the ground motions. Unlike conventional Modified Mercalli Intensities, the estimated intensities are not based on observations of the earthquake effects on people or structures. Locations within the same intensity area will not necessarily experience the same level of damage since damage depends heavily on the type of structure, the nature of the construction, and the details of the ground motion at that site. For this reason more or less damage than described in the MMI scale may occur. Large earthquakes can generate very long-period ground motions that can cause damage at great distances from the epicenter; although the intensity estimated from the ground motions may be small, significant effects to large structures (bridges, tall buildings, storage tanks) may be notable. The ground motion levels and descriptions associated with each intensity value are based on recent damaging earthquakes. There may be revisions in these parameters as more data become available or from further improvements in methodology. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: ESRI shapefile Format_Information_Content: Ground shaking intensity, acceleration, and velocity contours File_Decompression_Technique: unzip Transfer_Size: 2 megabytes Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://www.pnsn.org/shakemap/61271121/download/shape.zip Network_Resource_Name: http://www.pnsn.org/shakemap/61271121/download/hazus.zip Digital_Form: Digital_Transfer_Information: Format_Name: Text Format_Version_Number: 1.0 Format_Specification: Within lines, values are delimited by spaces. First line is a header containing <name/CUSPID of event> <mag> <epicentral lat> <epicentral lon> <MMM DD YYYY> <HH:MM:SS timezone> <W bound> <S bound> <E bound> <N bound> (Process time: <time>) <Location String> The remaining lines contain <lon> <lat> <pga> <pgv> <mmi> <psa03> <psa10> <psa30> Format_Information_Content: Ground-shaking intensity and acceleration data File_Decompression_Technique: unzip Transfer_Size: 0.5 megabytes Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://www.pnsn.org/shakemap/61271121/download/grid.xyz.zip Fees: none Metadata_Reference_Information: Metadata_Date: 2017-04-15 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey, GEO-CR-GHT Contact_Person: David J. Wald Contact_Position: Geophysicist Contact_Address: Address_Type: mailing Address: U.S. Geological Survey P.O. Box 25046, Mail Stop 966 City: Denver State_or_Province: CO Postal_Code: 80225-0046 Country: USA Contact_Voice_Telephone: (303) 273-8441 Contact_Facsimile_Telephone: (303) 273-8600 Contact_Electronic_Mail_Address: wald@usgs.gov Metadata_Standard_Name: Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998