1. What is the difference between an active and inactive fault?
2. Write down three (3) ways of determining an active fault.
a.
b.
c.
2. Write down three (3) ways of determining an active fault.
a.
b.
c.
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Answer:
1.*Active faults are structure along which we expect displacement to occur.
*Inactive faults are structures that we can identify, but which do no have earthquakes.
2. A. Geologists commonly consider faults to be active if there has been movement observed or evidence of seismic activity during the last 10,000 years.
B. Active faulting is considered to be a geologic hazard - one related to earthquakes as a cause. Effects of movement on an active fault include strong ground motion, surface faulting, tectonic deformation, landslides and rockfalls, liquefaction, tsunamis, and seiches.
C. Quaternary faults are those active faults that have been recognized at the surface and which have evidence of movement in the past 1.6 million years - the duration of the Quaternary Period.
Answer:
1.Active faults are structure along which we expect displacement to occur. By definition, since a shallow earthquake is a process that produces displacement across a fault, all shallow earthquakes occur on active faults. Inactive faults are structures that we can identify, but which do no have earthquakes.
2.Fault activity is assessed using geologic, geomorphic, geodetic, and seismologic data.