What is the are the strike and dip along a fault? How do you locate each?

Answer 1

The geometric orientation of any planar geological feature (e.g., bedding planes, joints, or faults) is described in terms of the feature's strike and dip. The strike is the compass direction of the line formed by the intersection of the planar feature with the Earth's surface, and the dip is the angle that the plane makes with respect to the surface.

If you are making measurements in the field, one uses a compass and "clinometer" (a device that measures angles) to determine the strike and dip, respectively. (by taking a compass bearing and measuring the dip angle).

If you are looking at a geologic map and trying to determine the strinke and dip of a feature, then this is indicated on the map by a special symbol that looks like a short line with another, shorter line on one side of the line at right angles to the first (i.e., a "tick mark"). There will be a number next to the shorter line. The strike direction is given by the orientation of the longer line, and the dip direction by the shorter "tick mark". The dip angle is given by the number next to the short "tick mark".

See sources.

Answer 2

Rocks are very slowly, but continuously moving and changing shape. Under high temperature and pressure conditions common deep within Earth, rocks can bend and flow. In the cooler parts of Earth, rocks are colder and brittle and respond to large stresses by fracturing. Earthquakes are the agents of brittle rock failure.

A fault is a crack across which the rocks have been offset. They range in size from micrometers to thousands of kilometers in length and tens of kilometers in depth, but they are generally much thinner than they are long or deep. In addition to variation in size and orientation, different faults can accommodate different styles of rock deformation, such as compression and extension.

Not all faults intersect Earth's surface, and most earthquakes do no rupture the surface. When a fault does intersect the surface, objects may be offset or the ground may cracked, or raised, or lowered. We call a rupture of the surface by a fault a fault scarp and identifying scarps is an important task for assessing the seismic hazards in any region

Answer 3

Strike and dip are imaginary features of the intersection of a plane intersecting with the "flat" earth. Strike is the orientation of a line (with respect to north) created where these two "planes" meet. Dip is the degree of rotation (and its direction) of the plane with respect to the earth. They are found (located) by using a Brunton Compass, which is the standard tool used by geologists.

Answer 4

under the colliding plate and above the subduction zone