XYanisotropy

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Entity_and_Attribute_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator:

REQUIRED: The name of an organization or individual that developed the data set.

Publication_Date:

REQUIRED: The date when the data set is published or otherwise made available for release.

Title: XYanisotropy

Geospatial_Data_Presentation_Form: vector digital data

Online_Linkage:

\\DUKE\C\Documents and Settings\jyoburn\Desktop\Geodatabase\anisotropy\XYsplits_all_format_dt.shp

Description:

Abstract:

This plot of seismic anisotropy shows two aspects of shear wave splitting. The size of the point shows the difference in time (in seconds) between the arrivals of the two incoming shear waves. A value of ?null? indicates either no data was taken for that location, or the difference in arrival times was small enough (less than 0.05 seconds) that the instrument could not detect a variation. The fast direction shows the approximate direction of flow in the mantle and/or the direction of maximum extension in the region.

Purpose:

Part of the Geophysics aspect of the Geoinformatics Network project.

Supplemental_Information:

The original data file was imported from a raw text file into Microsoft Excel. Column headers were added based on information listed at the top of the file. The file was then exported as a database IV (.dbf) file for easy import into the ArcGIS suite. ArcCatalog was used to convert the data into a shapefile and add projection information. The seismic anisotropy data was imported into ArcMap twice (as two separate shapefiles): Once for splitting time information (dt), the second for fast direction (phi).

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date:

REQUIRED: The year (and optionally month, or month and day) for which the data set corresponds to the ground.

Currentness_Reference:

REQUIRED: The basis on which the time period of content information is determined.

Status:

Progress: Complete

Maintenance_and_Update_Frequency: As needed

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -178.800000

East_Bounding_Coordinate: 174.700000

North_Bounding_Coordinate: 82.483000

South_Bounding_Coordinate: -75.899000

Keywords:

Theme:

Theme_Keyword_Thesaurus:

REQUIRED: Reference to a formally registered thesaurus or a similar authoritative source of theme keywords.

Theme_Keyword: Seismic

Theme_Keyword: Anisotropy

Theme_Keyword: Seismic Anisotropy

Access_Constraints:

Electronic Data Submission for Paper 98GL00650 Shear Wave Anisotropy in the Mariana Subduction Zone Matthew J. Fouch and Karen M. Fischer, Department of Geological Sciences, Brown University, Providence, Rhode Island Fouch, M.J., and K.M. Fischer, Shear wave anisotropy in the Mariana subduction zone, Geophys. Res. Lett., 25,

Introduction This dataset contains shear wave splitting measurements recorded at IRIS/GSN broadband seismic station GUMO, located on the island of Guam in the Mariana Islands. Data from both split phases and null measurements are included. Splitting measurements were made using the method of Silver and Chan [1991], and error estimates were made using the method of Fouch and Fischer [1996]. Most hypocenters are taken from the Preliminary Determination of Epicenters (PDE) catalog, but locations for events 930217, 941128, and 950706 are taken from unpublished data from R. van der Hilst [pers. comm., 1997].

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LA RISTRA data taken from: Gok, R., Ni, J.F., West, M., Sandvol, E., Wilson, D., Aster, R., Baldridge, W.S., Grand, S., Gao, W., Tillman, F., Semkin, S., Shear wave splitting and mantle flow beneath LA RISTRA, Geophysical Research Letters 30, no 12, 16.1-16.4, 2003

Use_Constraints:

REQUIRED: Restrictions and legal prerequisites for using the data set after access is granted.

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Jesse Yoburn

Contact_Organization: Arizona State University

Contact_Position: Graduate Student

Contact_Electronic_Mail_Address: jesse.yoburn@asu.edu

Data_Set_Credit:

Electronic Data Submission for Paper 98GL00650 Shear Wave Anisotropy in the Mariana Subduction Zone Matthew J. Fouch and Karen M. Fischer, Department of Geological Sciences, Brown University, Providence, Rhode Island Fouch, M.J., and K.M. Fischer, Shear wave anisotropy in the Mariana subduction zone, Geophys. Res. Lett., 25,

Introduction This dataset contains shear wave splitting measurements recorded at IRIS/GSN broadband seismic station GUMO, located on the island of Guam in the Mariana Islands. Data from both split phases and null measurements are included. Splitting measurements were made using the method of Silver and Chan [1991], and error estimates were made using the method of Fouch and Fischer [1996]. Most hypocenters are taken from the Preliminary Determination of Epicenters (PDE) catalog, but locations for events 930217, 941128, and 950706 are taken from unpublished data from R. van der Hilst [pers. comm., 1997].

1. SPLIT.TAB Shear wave splitting measurements and null measurements recorded at seismic station GUMO. 1.1 Column "date", YYMMDD, date of earthquake. 1.2 Column "phi", degrees, azimuth of fast direction. 1.3 Column "dt", seconds, length of splitting time. Value of 0 entered for null measurement. 1.4 Column "phierr", degrees, 95% confidence error for fast direction measurement. Value of 0 entered for null measurement. 1.5 Column "dterr", seconds, 95% confidence error for splitting time measurement. Value of 0 entered for null measurement. 1.6 Column "lat", degrees, latitude of earthquake hypocenter, north of equator. 1.7 Column "lon", degrees, longitude of earthquake hypocenter, east of Greenwich meridian. 1.8 Column "depth", km, depth of earthquake hypocenter. 1.9 Column "distance", angular degrees, distance from hypocentral earthquake location to station GUMO. 1.10 Column "phase", shear phase used for splitting analysis.

Native_Data_Set_Environment:

Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 4; ESRI ArcCatalog 8.3.0.800

Data_Quality_Information:

Lineage:

Process_Step:

Source_Used_Citation_Abbreviation:

C:\Documents and Settings\jyoburn\Desktop\Geodatabase\XYsplits_all_format_dBASE

Process_Date: March, 2003

Process_Step:

Process_Description: Metadata imported.

Source_Used_Citation_Abbreviation: C:\DOCUME~1\jyoburn\LOCALS~1\Temp\xml583.tmp

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Vector

Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: Entity point

Point_and_Vector_Object_Count: 849

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Geographic:

Latitude_Resolution: 0.000001

Longitude_Resolution: 0.000001

Geographic_Coordinate_Units: Decimal degrees

Geodetic_Model:

Horizontal_Datum_Name: North American Datum of 1927

Ellipsoid_Name: Clarke 1866

Semi-major_Axis: 6378206.400000

Denominator_of_Flattening_Ratio: 294.978698

Vertical_Coordinate_System_Definition:

Altitude_System_Definition:

Altitude_Resolution: 0.000001

Altitude_Encoding_Method:

Explicit elevation coordinate included with horizontal coordinates

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: XYanisotropy

Attribute:

Attribute_Label: FID

Attribute_Definition: Internal feature number.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain:

Sequential unique whole numbers that are automatically generated.

Attribute:

Attribute_Label: Shape

Attribute_Definition: Feature geometry.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Coordinates defining the features.

Attribute:

Attribute_Label: STN

Attribute:

Attribute_Label: LATITUDE

Attribute:

Attribute_Label: LONGITUDE

Attribute:

Attribute_Label: PHASE

Attribute:

Attribute_Label: DT

Attribute:

Attribute_Label: DTE_

Attribute:

Attribute_Label: DTE1

Attribute:

Attribute_Label: PHI

Attribute:

Attribute_Label: P_

Attribute:

Attribute_Label: P1

Attribute:

Attribute_Label: REF

Attribute:

Attribute_Label: NOTE

Distribution_Information:

Resource_Description: Downloadable Data

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Transfer_Size: 0.155

Metadata_Reference_Information:

Metadata_Date: 20031016

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization:

REQUIRED: The organization responsible for the metadata information.

Contact_Person: REQUIRED: The person responsible for the metadata information.

Contact_Address:

Address_Type:

REQUIRED: The mailing and/or physical address for the organization or individual.

City: REQUIRED: The city of the address.

State_or_Province: REQUIRED: The state or province of the address.

Postal_Code: REQUIRED: The ZIP or other postal code of the address.

Contact_Voice_Telephone:

REQUIRED: The telephone number by which individuals can speak to the organization or individual.

Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Time_Convention: local time

Metadata_Extensions:

Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>

Profile_Name: ESRI Metadata Profile

Metadata_Extensions:

Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>

Profile_Name: ESRI Metadata Profile