- The effect of an earthquake on the Earth's surface is called the intensity. The intensity scale consists of a series of certain key responses such as people awakening, movement of furniture, damage to chimneys, and finally - total destruction.
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The intensity scale consists of a series of certain key responses such as people awakening, movement of furniture, damage to chimneys, and finally - total destruction. Although numerous intensity scales have been developed over the last several hundred years to evaluate the effects of earthquakes, the one currently used in the United States is the Modified Mercalli (MM) Intensity Scale.
- Magnitude. Sketch of a traditional seismometer. (Public domain.) The time, location, and magnitude of an earthquake can be determined from the data recorded by seismometer.
- Energy Release. Earthquake magnitudes and energy release, and comparison with other natural and man-made events. (Courtesy Incorporated Research Institutes for Seismology, IRIS.)
- Intensity. Did You Feel It? map for the M6.0 Napa, California earthquake on August 24, 2014. The earthquake epicenter is shown as a star, and the geocoded intensities are shown as small colored squares.
- Examples. These examples illustrate how locations (and depth), magnitudes, intensity, and faults (and rupture) characteristics are dependent and related.
Nov 30, 2016 · The intensity scale consists of a series of certain key responses such as people awakening, movement of furniture, damage to chimneys, and finally--total destruction. Although numerous intensity scales have been developed over the last several hundred years to evaluate the effects of earthquakes, the one currently used in the United States is the Modified Mercalli (MM) Intensity Scale.
the amount of movement or energy releasedits intensity or its effect of intensity
- We Can Measure An Earthquake by
- Modified Mercalli Intensity Scale
Several scales of measurement have been developed. 1. The most familiar of these is the Richter scale- related to the size of seismic waves produced during a quake. 2. However, today seismologists more commonly rely on what is called the Moment Magnitude Scale, which measures the amount of energy released during an earthquake.
This is a semi-quantitative scale used to evaluate ground shaking and damage. This scale is composed of 12 increasing levels of intensity based on observed effects. These range from imperceptible shaking to catastrophic destruction, designated by Roman numerals. It is influenced by the amount of kinetic energy released, the substrate, the buildings, etc. Although it confounds many variables, it is valuable in
Modified Mercalli Intensity Scale - A copy of the scale composed of 12 increasing levels of intensity based on observed effects. http://neic.usgs.gov/neis/general/handouts/mercalli.html Did You Feel It? This is a web site through which you can report your own experiences during an earthquake, so that the USGA can use the Mercalli Scale of Intensity to map out ground shaking. For further information visit http://pasadena.wr.usgs.gov/shake/ Tremor Troop Earthquakes, Federal Emergency Management Agency, FEMA 159, April 1999, published by the National Science Teachers Association. Single copies of this publication may be obtained from FEMA at no cost by calling 1-800-480-2520. This is a complete binder of activities for Grades K-6. A fun and creative classroom activity to illustrate earthquake intensity can be found on pg. 110 – The Mercalli Scale – Calling Station KWAT.
With the Richter scale, a single sharp jolt measures higher than a very long intense earthquake that releases more energy. The moment magnitude scale more accurately reflects the energy released and the damage caused. Most seismologists now use the moment magnitude scale.
Jul 16, 2021 · PHIVOLCS Earthquake Intensity Scale (PEIS) Perceptible to people under favorable circumstances. Delicately balanced objects are disturbed slightly. Still Water in containers oscillates slowly. Felt by few individuals at rest indoors. Hanging objects swing slightly. Still Water in containers oscillates noticeably. Felt by many people indoors ...Intensity ScaleShakingDescriptionIScarcely PerceptiblePerceptible to people under favorable ...IISlightly FeltFelt by few individuals at rest indoors.IIIWeakFelt by many people indoors especially in ...IVModerately StrongFelt generally by people indoors and by ...
Jul 22, 2020 · Earthquake intensity scales describe the severity of an earthquake’s effects on the Earth's surface, humans, and buildings at different locations in the area of the epicenter. There can be multiple intensity measurements. The Modified Mercalli Scale measures the amount of shaking at a particular location.
5.0 - 5.9 magnitude: These tend to be VI - VII on the MM scale, meaning there could be slight damage depending on how the structure was built. 6.0 - 6.9 magnitude: These tend to be VII - IX on the...