Example 10.27: Comparing Earthquake Intensities
To compare the intensities of two earthquakes, you can convert their magnitudes to intensities using the formula , which converts to the exponential form . For instance, the 1906 San Francisco earthquake had a magnitude of , so its intensity was . The 2014 Los Angeles earthquake had a magnitude of , giving an intensity of . Forming a ratio to compare them gives . Dividing by subtracting the exponents yields , which evaluates to approximately . Therefore, the intensity of the 1906 earthquake was about times the intensity of the 2014 earthquake.
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Ch.10 Exponential and Logarithmic Functions - Intermediate Algebra @ OpenStax
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Evaluating a Logarithm by Converting to Exponential Form
Example: Evaluating Logarithms by Converting to Exponential Form
Graphing a Logarithmic Function by Converting to Exponential Form
Solving Logarithmic Equations by Converting to Exponential Form
Example 10.27: Comparing Earthquake Intensities
Try It 10.53: Comparing Earthquake Intensities in San Francisco
Try It 10.54: Comparing Earthquake Intensities in Chile and Los Angeles
Example 10.18: Converting to Logarithmic Form
Try It 10.35: Converting to Logarithmic Form
Try It 10.36: Converting to Logarithmic Form
Example 10.19: Converting to Exponential Form
Try It 10.37: Converting to Exponential Form
Try It 10.38: Converting to Exponential Form
Evaluating a Logarithm by Inspection
As an adult learner upskilling for a role as a financial data analyst, you are learning to use a forecasting tool that models growth over time. Your training manual states that a specific metric's timeline is modeled by the logarithmic equation . To configure the company's legacy software system, you must manually input this exact relationship in its equivalent exponential form. Which of the following equations should you enter?
You are a Quality Assurance (QA) specialist verifying a technical manual for a company's financial modeling software. The manual lists logarithmic growth models that must be correctly translated into exponential form for the software's calculation engine. Match each logarithmic equation found in the documentation to its mathematically equivalent exponential equation.
You are a junior technician at a sound engineering firm. A manual describes a signal's properties using the logarithmic equation . To convert this into its equivalent exponential form, , you must identify the structural role of each variable. In this conversion, the variable represents the ____ to which the base must be raised.
You are a health informatics technician reviewing a technical manual for a medical database system. The manual states that the relationship between a data scaling factor and the input value is defined by the logarithmic equation . The manual further states that this relationship is mathematically equivalent to the exponential equation . Based on the definition of logarithmic and exponential equivalence, is the manual's statement true or false?
Technical Reference: Logarithmic to Exponential Equivalence
Learn After
As part of an emergency management certification course, you are reviewing seismic measurement protocols. If an earthquake's magnitude is represented by and its intensity by , and they are related by the common logarithmic formula , which equation correctly expresses the intensity in exponential form?
As a risk assessment analyst for an insurance firm, you are reviewing historical seismic data to update regional property premiums. Arrange the mathematical steps you must take to calculate how many times more intense a larger earthquake is compared to a smaller one, using their given magnitudes.
As an urban resilience planner, you must be able to interpret seismic reports that compare different earthquake events using the common log formula . Match each mathematical component with its correct description in the context of comparing seismic events.
As a seismic risk analyst for a regional government, you are reviewing a report comparing two historical earthquakes. Earthquake A had a magnitude of 8.0 and Earthquake B had a magnitude of 6.0. Based on the relationship (where is magnitude and is intensity), Earthquake A was exactly 100 times more intense than Earthquake B.
Mathematical Expression for Earthquake Intensity Ratios