The magnitude of an earthquake with intensity I is measured using a seismograph. The intensity I is converted into the Richter scale number using the following formula R=log10I. An earthquake in Town A was measured 3 on the Richter scale, while the earthquake in Town B measured 5 on the Richter scale. Let IA and IB be the intensity of the earthquakes in Town A and B respectively. What is the value of IBIA?
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A seismograph 300 km from the epicenter of an earthquake recorded a maximum amplitude of 5.9 cross product 102µm. Find this earthquake's magnitude