What is the time frame for small foreshocks that precede a major eathquake occur

1 answer:

6 0

Scientists can't tell that an earthquake is a foreshock until the larger earthquake happens. The largest, main earthquake is called the mainshock. Mainshocks always have aftershocks that follow. These are smaller earthquakes that occur afterwards in the same place as the mainshock.

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Correlation

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Correlation simply means matching rocks or strata's of the same age. This rock units or sedimentary strata's may be matched from same region or even different continents.

In correlation the major task is to establish time equivalency of various rocks or sedimentary strata's.

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Fossil contents present in different strata; if similar fossil contents found in different regions, geologist can determine the age similarities.

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