Development and calibration of distance attenuation curve for local seismic data are requisite for better seismo-tectonic modeling and seismic hazard estimation. Local magnitude scale developed for Northern Punjab (Potwar Plateau and Salt Range) has been tested against different geometrical spreading values. Trade-off or linear inter dependence has been observed between local magnitude scale parameters. To address this issue, either nonparametric approach with proper smoothing factor or parametric approach with single parameter (a) as constant may be used. In this study, we fixed geometrical spreading parameter to eliminate parameters dependency and hence reduction in error was achieved. Geometrical spreading was observed to be distance-dependent factor rather than a constant parameter. A variance reduction of 11%, with zero error in anelsatic attenuation parameter was achieved by fixing geometrical parameter and performing parametric inversion. The new magnitude scale with distance correction factor is given by the expression; \(-{\mathrm{log}}A_o = {\mathrm{log}}(R)+0.0006(R)-1.7419\), where R is hypocentral distance, valid for \(R < 130\) km and depth < 30 km. Lower attenuation (i.e., \(b = 0.0006\)) was observed in new magnitude scale as compared to previously developed magnitude scale (i.e., \(b = 0.00115\)) for the same area. The pronounced lower attenuation of seismic waves beneath the intraplate region of Northern Punjab is apparently owes to regional tectonics. Northern Punjab is relatively stable part of the Indian shield with Precambrian basement rock overlaid by varying thickness of salt diapirs and thick sedimentary cover.

局部地震数据的距离衰减曲线的开发和校准对于更好的地震构造建模和地震危险性估计是必不可少的。为旁遮普北部（Potwar 高原和盐区）开发的局部震级已针对不同的几何扩展值进行了测试。已经观察到局部幅度尺度参数之间的权衡或线性相互依赖。为了解决这个问题，无论是具有适当平滑因子的非参数方法还是具有单个参数的参数方法（a) 作为常数可以使用。在这项研究中，我们固定几何扩展参数以消除参数依赖性，从而减少误差。观察到几何扩展是依赖于距离的因素而不是一个常数参数。通过固定几何参数和执行参数反演，实现了 11% 的方差减少，并且衰减参数为零误差。带有距离校正因子的新震级由下式给出；\(-{\mathrm{log}}A_o = {\mathrm{log}}(R)+0.0006(R)-1.7419\)，其中R是震源距离，对\(R < 130\) km 和深度有效< 30 公里。更低的衰减（即\(b = 0.0006\)) 与先前开发的震级尺度（即\(b = 0.00115\)）相比，在新的震级尺度上观察到相同区域。北旁遮普板内区域下方地震波的明显较低衰减显然是由于区域构造。旁遮普北部是印度地盾相对稳定的部分，前寒武纪基底岩覆盖着不同厚度的盐底辟和厚厚的沉积覆盖层。