Evaluation of Unusual Damage Caused by Amplified Seismic Waves Passing Through Around Quetta Basin Using Aftershock System Analysis
A total of 1200 aftershocks of Ziarat-Pashin earthquake of October 29, 2008 recorded till January 27, 2009 were seismically analyzed and the results indicated the presence of earthquake seismic waves amplifying geological structures around Quetta basin in the Ziarat -Pashin region, which acted like amplifiers, amplifying the magnitude of passing seismic waves and releasing relatively many times more energy, causing stronger shaking of certain locations even though being far away from the epicenter. The amplification was greatest for high-frequency waves and was less powerful at lower frequencies, which, in fact facilitated the focusing of seismic waves which caused intense shaking and resultant severe damage. Muddy structures were vulnerable because the seismic waves passing through such loosely packed muddy structures, cohesion less particles in alluvial soils or slits and sandy soils got amplified manifold. Therefore many collapsed houses were found near these mountains and hills of subduction zone.
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