# Section 19.3 - Measuring and Locating Earthquakes

Section 19.3 Measuring and Locating Earthquakes 8th Grade Earth and Space Science Class Notes Earthquake Magnitude and Intensity

Richter scale measures the magnitude (energy) of an earthquake. Determined by the amplitude (height) of the seismic wave Each number on the Richter scale corresponds to an amplitude increase of 10x Each increase in magnitude corresponds to a 32x

increase in energy Earthquake Magnitude and Intensity Moment magnitude measures the energy released by an earthquake, taking into account the size of the fault rupture, the amount of movement along the fault, and the

rocks stiffness Used most often by seismologists This is what is often reported by news outlets Earthquake Magnitude and Intensity Earthquake Magnitude and Intensity

Modified Mercalli measures the intensity of the earthquake by the type and amount of damage it causes Earthquake Intensity The intensity of an earthquake depends primarily on the amplitude of the surface

waves generated. Intensity is highest closest to the epicenter and decreases as you travel further from the epicenter. Depth of Focus Earthquakes are classified as shallow,

intermediate, or deep, depending on the location of the focus. Shallow-focus earthquakes are the most damaging. Locating an Earthquake An earthquakes epicenters location, as well

as the time of occurrence, can be determined using seismograms and travel-time curves. Locating an Earthquake Distance to an Earthquake The distance to an earthquakes epicenter can be determined by measuring the separation

on any seismogram and identifying that same separation time on the travel-time graph. Locating an Earthquake Distance to an Earthquake Scientists identify the seismic stations on a map, and draw a circle with the radius of

distance to the epicenter from each station. The point where all the circles intersect is the epicenter. Locating an Earthquake Time of an Earthquake Seismologists can use a seismogram to gain

information about the exact time that an earthquake occurred at the focus. The time can be determined by using a table similar to a travel-time graph. Seismic Belts The majority of the worlds earthquakes occur

along narrow seismic belts that separate large regions with little or no seismic activity. The locations of most earthquakes correspond closely with tectonic plate boundaries.

## Recently Viewed Presentations

• Women's ministry. Translation from verse 9in like manner, that women/wives adorn themselves in modest apparel with propriety and moderation, not with braided hair or gold or pearls or costly clothing, but which is proper for women/wives professing godliness with good...
• Also called Semantic Slanting. Choosing words or images to convince others to think or agree with something. Propaganda. The method in which the author passes on persuasive ideas . Posters . Campaign Speeches. Commercials . Essays . Argument vs. Counter...
• Using Context Clues. ... Definition: Metrology, or the science of weather forecasting, ... Unlike his despondent opponent, kwami appeared hopeful, happy and sure he would win. The unfamiliar word is the opposite of a familiar word or phrase.
• Psalm Categories . Wisdom 4. Penetential 7. Assurance. Nature 5. Worship 8. Praise. Word 6. Suffering 9.Royal. Word Psalms. Psalms that praise God for His special revelation to us through His Word. The law of the Lord is perfect, restoring...
• MATLAB IMAGE PROCESSING TOOLBOX Gulsah Tumuklu Ozyer Introduction MatLab : Matrix Laboratory A high-level language for matrix calculations, numerical analysis, & scientific computing Programming Can type on command line, or use a program file ("m"-file) Semicolon at end of line...
• A. dissection of the flowers of both tall and short African violet plants . B. microscopic observation of the nuclei of fruit fly cells . C. biochemical analysis of DNA produced in the F2 generations of roan cattle . D....
• Meteorology- study of weather and the forces and processes that cause it. Explore storm patterns, climates, and what factors cause our daily weather. Meteorologist is a scientist who studies weather patterns in order to predict daily weather
• Country or continent adjective people singular people in general Africa African an African the Africans America American an American the Americans Asia Asian an Asian the Asians Australia Australian an Australian the Australians Belgium Belgian a Belgian the Belgians Brazil...