PPT-How Do We Measure an Earthquakes Intensity?

The Richter Scale VS The Mercalli Scale I When an Earthquake Occurs Scientists monitoring earthquake activity receive the pwave and the swave recordings on their seismographs. Locating Earthquakes. How do seismologists know when and where earthquakes begin? . They depend on earthquake-sensing instruments called seismographs. . Seismographs. are instruments located at or near the surface of the Earth that record seismic waves. . Earthquakes are very difficult to predict.. Scientists understand why they happen, but it is very difficult to predict their . timing, exact location, and . strength. Pressure. build-up happens underground, over very long periods of . Seismograph. Or seismometer, is an instrument used to detect and record earthquakes.. Seismogram. A record written by a seismograph in response to ground motions produced by an earthquake, explosion, or other ground-motion sources.. . By : . Deavian. foster . Class : 5H. What is an earthquake?. A earthquake is a shaking of the earths crust and is a geological phenomenon . Earthquakes can cause intense vibration of the ground, soil liquefaction, and distortion of the ground. Earthquakes can happen almost anywhere but are most common along the boundaries of the tectonic plates. Earthquakes are primarily caused of movement of the tectonic plates. It lasts more than a few seconds.. : December 1811, January 1812, February 1812 . Eastern U.S. earthquakes less frequent, but more widely felt. Crust is older and transmits stress. Intraplate Earthquakes. Earthquake Size and Characteristics. Why you need to prepare for the next earthquake . Alaska has more earthquakes than any other region of the U.S. . And in fact is one of the most seismically active area of the world.. Great earthquakes (Earthquakes larger than magnitude 8) rock the state on average every 13 years since the 1900. . earthquake. (also known as a . quake. , . tremor. or . temblor. ) is the result of a sudden release of energy in the . Earth's. . crust. that creates . seismic waves. . . The . seismicity. , . seismism. 8. th. 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. 8. th. 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. 19.3 . –. Measuring and Locating Earthquakes. Magnitude. Magnitude = a measure of energy produced by earthquake. Amplitude = Height of wave. Richter Scale = . numerical rating system used to measure the magnitude of an earthquake. 19.3 . –. Measuring and Locating Earthquakes. Magnitude. Magnitude = a measure of energy produced by earthquake. Amplitude = Height of wave. Richter Scale = . numerical rating system used to measure the magnitude of an earthquake. 19.3 notes out and have them ready.. We’re going to investigate possible . Mercalli. Intensity values for different pictures. We’ll then map out an epicenter using . Mercalli. Intensity values.. ANNALS OF GEOPHYSICSVOL 47N 2/3April/June 2004regime consisting of central and local govern-ments canton and county Meanwhile there wasa reform and a standardization of the writing sys-tem From t Contents. 01. Background to measurements. 02. Categorical pain intensity and pain relief scales. 03. Visual analogue and composite pain scales. 04. Patients must measure their own pain. 05. How pain scores are expressed and calculated.