Jules Verne Voyager Jr: Add Velocities

You can superimpose observed and/or model velocity vectors on your map, showing the direction and rate of plate movement. The velocity vectors represent a compilation of 2933 geodetic measurements from around the world. A remarkable characteristic of the geodetic compilation is that you can select from some 21 frames of reference, allowing a visual representation of both 'absolute' plate motion (in a no-net rotation reference frame) and relative motion along all of the world's plate boundaries.

First, select a plate in relation to which the velocities will be drawn. For example, if you choose Africa Fixed, the velocities will be drawn in relation to the fixed plate of Africa. Then, select the type of data to be displayed. (In browsers other than Netscape 4, the options will not display until you have selected a plate). You can select from the following:

To change plates, select another item in the drop-down box. To turn them off altogether, click on No Plate Velocities. To switch between model, observational, or both types of data, click on the appropriate radio button. Note that the velocities will not display until you have clicked on the Make Changes button. In addition, the velocities will appear on all subsequent maps until you deselect them.

The map shows the location of the plates from which you can choose. Each plate is described briefly below. For more information, access the USGS Major Tectonic Plates of the World and Information on Plate Tectonics websites, the NASA Digital Tectonic Activity Map of the Earth website, or the This Dynamic Planet PDF file. Below the table is a map from which the JVV Jr. velocities and strain were derived.

Plate Reference Frames
Plate Descriptions
No Plate Velocities
Turns off all velocities   
Reference frame describing the "average" velocity for the global system of tectonic plates
Microplate consisting of eastern Siberia and northern Manchuria (east of the Baikal Rift)
Antarctic continent plus Southern Ocean
Arabian Penninsula plus east of the Red Sea
Microplate consisting of Turkey and eastern Aegean Sea
Australian continent plus surrounding areas of Indian Ocean and Tasman Sea
Central Indian Ocean
Caribbean Sea
Microplate northeast of the Indonesian Archipeligo
East central Pacific Ocean (northeast of the Galapagos Islands)
Eurasian continent north of the Alpine-Himalayan mountain belt and west of the Baikal Rift
Indian subcontinent south of the Himalaya Mountains
Juan de Fuca
Microplate west of North America (British Columbia/Northwest United States)
Southeastern Pacific Ocean (southeast of the Galapagos Islands)
North American
North American continent plus the western North Atlantic Ocean
Nubia (West Africa)
African continent (west of the East African rift) plus the southeastern Atlantic Ocean
Microplate consisting of the Sea of Okhotsk and Kamchatka Peninsula
Pacific Ocean west of the East Pacific Rise and east of the Mariana trench
Philippine Sea west of the Mariana islands and east of the Philippine Islands
Microplate west of southern North America
Microplate between Atlantic Ocean, Antarctica, Pacific Ocean, and South America
South American
South American continent plus southwestern Atlantic Ocean
South China
Microplate consisting of easternmost China (east of Tibet and north of Indochina)
Somalia (East Africa)
Microplate consisting of eastern Africa (east of the East African rift) plus the western Indian Ocean
Microplate consisting of southeastern Eurasia and surrounding seas
Microplate consisting of the Tarim Plateau (Takla-Maklan Desert) north of the Tibetan Plateau

The velocities and strain on JVV Jr. maps are derived from the plate tectonic model of Kreemer et. al. 2002 shown below. Black areas are defined as rigid plates; tan areas are deformable boundary zones between the plates.

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