Trench Characteristics Lab

Open MICRODEM.

Review Labs introduction.

Change the program version to geology.

Pick the "Trench geometry" option under File, Structural geology lab.

Geology options

Picture Benioff Zone

   Topographic Profiles

Rotate continents  Two plate motions to get the rate of convergence between the two plates (insure that you pick the correct plates).  This could vary along the trench.  You also want to see if the convergence vector is perpendicular to the trench, or oblique.  You could also use one of the plate motion calculators on the plate references page.

 

 Status bar on the bottom of the screen will show the lat/long and the value in the ages or sediment thickness grid and the ETOPO1 depth.

Map query,   Rectangular region: select just the earthquake focal mechanisms or volcanoes in your region.


 

Trench Name/Location  
Trench Dimensions (depth, width)  
Volcanoes, number and elevations  
Dip & Depth Benioff Zone  
Earthquake magnitudes  
Earthquake distribution  
Convergence rate and direction  
Age subducting crust  
Characteristics of overriding plate  
Sediment thickness in trench and forearc basin  

 

Location Zone, between Students
Aleutians W155 and W175  
Andes  S8 and S20  
  S20 and S29  
Central America N12 and N17  
Indonesia E97 and E113  
Japan N35 and N45  
  N45 and N55  
Mariana Trench N10 and N15  
  N15 and N20  
Tonga-Kermadoc Trench S10 and S20  

last revision 12/1/2014