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# What is a fault plane solution?

## What is a fault plane solution?

A fault plane solution is a way of showing the fault and the direction of slip on it from an earthquake, using circles with two intersecting curves that look like beach balls. Also called a focal-mechanism solution.

## What is fault plane in a fault?

The fault plane is the planar (flat) surface along which there is slip during an earthquake.

What is dip slip?

Dip-slip faults are inclined fractures where the blocks have mostly shifted vertically. If the rock mass above an inclined fault moves down, the fault is termed normal, whereas if the rock above the fault moves up, the fault is termed reverse.

What is a focal solution?

A focal mechanism solution (FMS) is the result of an analysis of wave forms generated by an earthquake and record- ed by a number of seismographs. It usually takes at least 10 records to produce a reasonable FMS, and then only if the seismograph stations are well distributed geographically around the epicenter.

### What refers to the exposed fault plane of a fault when one fault block moves up?

reverse (thrust) fault – a dip-slip fault in which the upper block, above the fault plane, moves up and over the lower block. This type of faulting is common in areas of compression, such as regions where one plate is being subducted under another as in Japan.

### What are the 3 fault types?

There are three main types of fault which can cause earthquakes: normal, reverse (thrust) and strike-slip. Figure 1 shows the types of faults that can cause earthquakes. Figures 2 and 3 show the location of large earthquakes over the past few decades.

What are the types of faults?

There are four types of faulting — normal, reverse, strike-slip, and oblique. A normal fault is one in which the rocks above the fault plane, or hanging wall, move down relative to the rocks below the fault plane, or footwall.

What is types of fault?

There are four types of faulting — normal, reverse, strike-slip, and oblique. A normal fault is one in which the rocks above the fault plane, or hanging wall, move down relative to the rocks below the fault plane, or footwall. A reverse fault is one in which the hanging wall moves up relative to the footwall.

#### What is another name for dip slip?

Dip-Slip Fault: In geology, a dip-slip fault is any fault in which the earth’s movement is parallel with the dip of the fault plane. For example, a normal fault, reverse fault, or listric fault.

#### What is the rake of an earthquake?

Rake – the direction the hanging wall moves during rupture, measured relative to the fault strike (between -180 and 180 decimal degrees).