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Calibration of local magnitude scale for Hindukush continental subduction zone

Earthquake Science 2021年第2期34卷 114-122页

作者： Muhammad N.Mushtaq Muhammd Tahir Muhammd T.Iqbal Muhammd A.Shah Saleem Iqbal Talat Iqbal Center for Earthquake Studies Islamabad 46000Pakistan

Hindukush is an active subduction zone where at least one earthquake occurs on daily *** seismic hazard studies,it is important to develop a local magnitude scale using the data of local seismic *** have computed local magnitude scale for Hindukush earthquakes using data from local network belonging to Center for Earthquake Studies(CES)for a period of three years,i.e.2015–2017.A total of 26,365 seismic records pertaining to 2,683 earthquakes with magnitude 2.0 and greater,was used with hypocentral distance less than 600 *** scale developed by using this data comes to be M_(L)=logA+0.929logr+*** magnitude determined through formulated relation was compared with that of standard relation for Southern California and relation developed by the same authors for local network for Northern *** was observed that Hindukush region has high attenuation as compared to that of Southern California and Northern Punjab which implies that Hindukush is tectonically more disturbed as compared to the said regions,hence,seismically more active as *** have calculated station correction factors for our *** correction factors do not show any pattern which probably owes to the geological and tectonic complexity of this *** deviation and variance of magnitude residuals for CES network determined using Hutton and Boore scale and scale developed in this study were compared,it showed that a variance reduction of 44.1%was *** of magnitude residuals for different distance ranges was almost zero which showed that our magnitude scale was stable for all distances up to 600 *** developed magnitude scale will help in homogenization of earthquake *** has been observed that b-value of CES catalog decreases when magnitude is calculated by using newly developed magnitude scale.

关键词： local magnitude scale attenuation station correction factor hazard studies for Hindu Kush region

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