1. Describe epicenter and focus of an earthquake
2. Differentiate Intensity of an earthquake from magnitude an earthquake
3. What is the difference between an active and inactive fault?
4. Write down three (3) ways of determining an active fault.
2. Differentiate Intensity of an earthquake from magnitude an earthquake
3. What is the difference between an active and inactive fault?
4. Write down three (3) ways of determining an active fault.
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Answer:
1. The focus is the place inside Earth's crust where an earthquake originates.
2. The severity of earthquake shaking is assessed using a descriptive scale – the Modified Mercalli Intensity Scale.
3. 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.
4. Faults are delineated by geologic, remote-sensing, seismic reflection, gravity, magnetic, and trenching methods. Fault activity is assessed using geologic, geomorphic, geodetic, and seismologic data.
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