Comparing Earthquake Intensities: 1906 San Francisco vs. 1989 Loma Prieta
To compare the 1906 San Francisco earthquake (magnitude 7.8) and the 1989 Loma Prieta earthquake (magnitude 6.9), convert their magnitudes to intensities. Using the earthquake intensity model , the equivalent exponential form is . The intensities are and , respectively. The ratio of the 1906 earthquake's intensity to the 1989 earthquake's intensity is . Subtracting the exponents gives , which evaluates to approximately 7.94. Thus, the 1906 earthquake was approximately 7.94 times as intense as the 1989 earthquake.
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Ch.10 Exponential and Logarithmic Functions - Intermediate Algebra @ OpenStax
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Example: Evaluating Logarithms by Converting to Exponential Form
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Example 10.27: Comparing Earthquake Intensities
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Example 10.18: Converting to Logarithmic Form
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Example 10.19: Converting to Exponential Form
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Comparing Earthquake Intensities: 1906 San Francisco vs. 1989 Loma Prieta
As part of an emergency response training program, you are reviewing the metrics used to quantify seismic events. The magnitude of an earthquake, , is calculated using the Richter scale model . What does the variable represent in this equation?
Imagine you are an intern for a local emergency management agency reviewing seismic safety protocols. To correctly interpret incoming earthquake data, you must be familiar with the Richter scale model . Match each term with the metric or scale it represents in this model.
During an emergency response evaluation at a municipal utility plant, technicians use the Richter scale model to report seismic activity. True or False: In this equation, the variable represents the intensity of the earthquake's shock wave.
Richter Scale Magnitude Model
As a technician at a seismic monitoring station, you are responsible for processing data to report on earthquake size. Arrange the following steps in the correct order to describe how the Richter scale model is used to determine an earthquake's magnitude.
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Comparing Earthquake Intensities: 1906 San Francisco vs. 1989 Loma Prieta
Learn After
As a risk assessment analyst for an insurance firm, you are tasked with comparing historical seismic events to update property damage models. To begin comparing two earthquakes, you must convert their given magnitudes () into intensities (). Based on standard earthquake models, which of the following formulas correctly represents this conversion?
A seismic analyst for a city government is preparing a report comparing the 1906 San Francisco earthquake (magnitude 7.8) and the 1989 Loma Prieta earthquake (magnitude 6.9). Arrange the steps below in the correct mathematical order to determine how many times more intense the 1906 earthquake was compared to the 1989 earthquake.
As a trainee in an emergency management office, you are reviewing historical data for the 1906 San Francisco earthquake (magnitude 7.8) and the 1989 Loma Prieta earthquake (magnitude 6.9). Using the intensity model , match each description with its corresponding numerical value or mathematical expression used to compare these two events.
In a seismic safety report comparing two historical events, the 1906 San Francisco earthquake (magnitude 7.8) is found to be approximately ____ times as intense as the 1989 Loma Prieta earthquake (magnitude 6.9) when using the model .
According to the seismic intensity model , the ratio of intensities between the 1906 San Francisco earthquake (magnitude {}7.8) and the 1989 Loma Prieta earthquake (magnitude {}6.9) is correctly represented by the expression .
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