Changes

==Brunton Compass==

==Brunton Compass==

Usually the direction of strike and dip can be determined easily with left hand rule. They also can be measured accurately with Brunton Compass. Parts of Brunton Compass explained by Figure 2:

Usually the direction of strike and dip can be determined easily with left hand rule. They also can be measured accurately with a Brunton compass. Parts of the Brunton Compass, as explained by [[:File:Brunton Compass.png|Figure 2]]:

[[File:Brunton Compass.png|framed|center|{{figure number|2|}}The standard Brunton compass<ref name=geo>http://www.geology.sdsu.edu/visualgeology/geology101/Geology101Labs/structureLab9.pdf</ref>]]

[[File:Brunton Compass.png|framed|center|{{figure number|2|}}The standard Brunton compass<ref name=geo>http://www.geology.sdsu.edu/visualgeology/geology101/Geology101Labs/structureLab9.pdf</ref>]]

Brunton compass can be used for:

A Brunton compass can be used to:

* Measure strike and dip of planes

* Measure [[strike]] and [[dip]] of planes

* Measure trend and plunge of lines

* Measure trend and plunge of lines

* Measure vertical angles

* Measure vertical angles

* Set local declination

* Set local declination

In determine the direction of strike and dip, there are four quadrants at Brunton Compass such as North East, North West, South East, and South West. Each of them have value 0-90 degree. For example in Figure 3, N40o W mean the direction of strike is 40o from North to West. 45o is amount of dip. The direction of dip always perpendicular with direction of strike, so we know the direction of dip is N50o E.

In determine the direction of strike and dip, there are four quadrants of a Brunton compass: northeast, northwest, southeast, and southwest. Each of them have value 0-90°. For example in [[:File:Direction of strike and dip.png|Figure 3]], N40° W mean the direction of strike is 40° from north to west. 45° is amount of dip. The direction of dip always perpendicular with direction of strike, so we know the direction of dip is N50° E.

[[File:Direction of strike and dip.png|framed|center|Figure 3. Direction of strike and dip<ref name=geo/>]]

[[File:Direction of strike and dip.png|framed|center|Figure 3. Direction of strike and dip<ref name=geo/>]]