DETERMINATION OF SOME COMMON MAGNITUDE SCALES USING BROADBAND DIGITAL SEISMOGRAMS
Supervisor: Toshiaki YOKOI
Pakistan Meteorological Department (PMD) has started establishing the new digital seismic network including broadband stations in Pakistan after the 2005 Kashmir earthquake. This study was aimed to summarize the basic information to make a strategy for an appropriate way of the routinary tasks of the new seismic network. In this paper, we have checked some magnitude scales commonly used with broadband seismograms today and their operability. For this purpose, we have analyzed the 2005 Kashmir earthquake taking data from seventeen broadband stations through IRIS to determine the moment magnitude in the time domain using few sets of density and P-wave velocity as well as in the frequency one. As a whole we have made a comparison between the various magnitude scales like Mw, Mwp, Ms(BB) and Ms20. In conclusion, we emphasize on Mw determination and its application in future for the PMD new network which will be a first step towards the disaster mitigation based on the quick and rapid determination.
|Citation: ||Bulletin of IISEE, 42, 25-30.|