By KAMALESH KUMAR
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The intensity scale can also be used to illustrate the anticipated damage at a site due to a future earthquake. 5 summarises the modified Mercalli intensity scale. 5: Modified Mercalli Intensity Scale Intensity Level Reaction of observers and types of damage I Reactions: Not felt except by a few people under especially favorable circumstances. Damage: No damage. II Reactions: Felt only by a few persons at rest, especially on upper floors of buildings. Many people do not recogonize it as an earthquake.
Equations were developed from the western united states data. 1d) Y = peak horizontal acceleration (in gal) (1 gal = 1 cm/sec2) where, M = earthquake magnitude r = distance (in km) to energy center, default at a depth of 5 km. 1, seismic design guidelines for essential buildings provides instructions for site seismicity studies.
The P wave will be the first wiggle that is bigger than the rest of the little ones (the microseisms). Because P waves are the fastest seismic waves, they will usually be the first ones that our seismograph records. The next set of seismic waves on your seismogram will be the S waves. These are usually bigger than the P waves. If there aren’t any S waves marked on your seismogram, it probably means the earthquake happened on the other side of the planet. S waves can’t travel through the liquid layers of the earth so these waves never made it to our seismograph.